nureg/ia-0170, 'international agreement report - relap5 ...in test b4.2 the primary inventory...

NUREG/IA-0170

InternationalAgreement Report

RELAP5/MOD3.2Post Test Calculation of thePKL-Experiment PKLIII-B4.3

Prepared byL. Karner

Siemens Energierzeugung (KWU)Freyerslebenstrasse 1D-91058 ErlangenGermany

Office of Nuclear Regulatory ResearchU.S. Nuclear Regulatory CommissionWashington, DC 20555-0001

December 1999

Prepared as part ofrhe Agreement on Research Participation and Technical Exchangeunder the International Code Application and Maintenance Program (CAMP)

Published byU.S. Nuclear Regulatory Commission

NUREG/IA-0170

InternationalAgreement Report

RELAP5/MOD3.2Post Test Calculation of thePKL-Experiment PKLIII-B4.3

Prepared byL Kamer

Siemens Energierzeugung (KWU)Freyerslcbenstrasse 1D-91058 ErlangenGermany

Office of Nuclear Regulatory ResearchU.S. Nuclear Regulatory CommissionWashington, DC 20555-0001

December 1999

Prepared as part ofThe Agrereent on Research Participation and Technical Exchangeunder the International Code Application and Maintenance Program (CAMP)

Published byU.S. Nuclear Regulatory Commission

Report-No.: KWU NDS1 /98/ E2041 Page1

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Table of Contents

AbstractAbbreviations

1 Introduction2 Description of the PKL Test Facility3 Description of Experiment PKLIII-B4.33.1 Objectives of Test PKLIII-B4.33.2 Initial and Boundary Conditions of the Test B 4.3

3.3 Sequence of Events3.4 Phenomenological Analysis of Test Results

4 Results of RELAPS/Mod 3.2 Analysis4.1 Description of RELAP5/Mod 3.2

4.2 Description of Input Model4.3 Calculational Procedures and Boundary Conditions4.4 General System Response4.5 Steam Generator Heat Transfer as a Function of

Nitrogen Distribution In the Primary System4.6 Propagation of Nitrogen Concentration in the

Steam Generator U-Tubes5 Conclusions

ReferencesUst of FiguresFigures

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Abstract

The PKL III test facility (Pdrnmr-Kreis-Lauf) simulates a typical 1300 MWePressurized Water Reactor of Siemens/KWU. In test B4.3, the Influence of non-condensables on heat transfer In the steam generators during reflux condenserconditions was investigated.

This report presents the results of a post-test analysis of PKL 1I1-B4.3 usingRELAP5/Mod 3.2. A description of the input model is given, and thecorrespondence of measured and calculated results is discussed.The results of the calculation show differences in the distribution of nitrogen in theprimary system compared to the experiment. When nitrogen was injected into thehot leg of the primary system, the heat transfer in the affected steam generatordecreased. In contrast to the experiment RELAP calculated that the volumes inthe adjacent steam generator did not get the full amount of nitrogen and thatnitrogen was transported from the steam generators to other locations during thecourse of the transient. Thus the heat transfer in these steam generators laterincreased in contradiction to the measured values.In the steam generator tubes, RELAP calculated that the nitrogen accumulates inthe descending part as predicted in the experiment. For the ascending U-tubesRELAP predicted that the nitrogen was transported to the loop seal, which was notseen in the experiment.Fluctuations occured during the course of the RELAP5/Mod 3.2 analysis of thePKLIII B4.3 experiment. This phenomenon may be the main reason, that RELAPcalculates the transport of nitrogen from the steam generators into the system andpredicts finally a homogeneous distribution of nitrogen in the primary system.The analysis performs an inkind contribution to the CAMP contract.

The reproduclion, Irnsmassion or use of Ithis dOcumiwt Or its COMMent iS not

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Abbreviations

ACCUARVASC.Byp.CAMPCCFLCLCV, CNTRLVARDCDEDepress., dpDESC.DHDiff.Exp.HKPM, RCPHLInt., lntegr.LLOCALPLMFLOWJNPKL, PCLPress., PPrimary-S.PWRRRDB, RPVSATTEMPSATT-Pr.SATT-Sec.SBBSBLOCASecondary-S.SGSPWSVTEMPUPLU-tubes

accumulatorAbblaseregelventil (relief valve)ascending (U-tubes)bypassCode Assessment and Maintenance Programcounter current flow limitationcold leg, collapsed levelcontrol variabledowncomerDampferzeuger (SG)depressurizationdescending (U-tubes)Druckhalter (pressurizer)difference.experimentHauptkOhlmittelpumpe (reactor coolant pump)hot legintegratedlooploss of coolant accidentlower plenumjunction mass flownitrogenPrimArkreislauf, Primary Coolant Looppressureprimary sidepressurized water reactorRELAPReaktordruckbehhlter, reactor pressure vesselsaturation temperaturesaturation temperature primary sidesaturation temperature secondary sideStabbOndelbeh~lter (rod bundle vessel)small break LOCAsecondary sidesteam generatorSpeisewasser (feedwater)Sicherheltsventil (safety valve)temperatureupper plenumtubes with n-profile for SGs

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1 Introduction

The PKL III test facility simulates a typical 4 loop 1300 MWe pressurized water

reactor of SiemenslKWU design. Within the PKL 111-14 test series, three tests

have been performed to investigate the influence of non-condensables in the

primary system on steam generator heat transfer.

In Test B4.1 the primary inventory was 100 % and thus the influence of non-

condensables on single-phase natural circulation was investigated. In Test B4.2

the primary inventory was reduced to 85% which generated two-phase natural

circulation. In test B4.3, by a further reduction of the inventory to 35% the

influence of non-condensables on reflux-condenser conditions was investigated.

In this report a post-test analysis of PKL III-B4.3 using RELAP5/Mod 3.2 is

presented. A description of the input model is given, and the correspondence of

measured and calculated results is discussed.

The purpose of this analysis Is to serve as a contribution to the verification of

RELAP5/Mod 3.2's ability to handle a non-condensable component in the

gaseous phase properly.

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2 Description of the PKL Test Facility

The PKL IIl test facility simulates a typical 1300 MWe pressurized water reactor ofSiemens/KWU of a volume/power scale of 1:145 (Fig. 2.1). All elevationscorrespond to real plant dimensions. It is a large scale facility with four primaryloops, which are arranged symmetrically around the pressure vessel. Each of thefour loops contains a main coolant pump and a fully scaled steam generator withprototypical tubing and tube sheet. The core is simulated by a bundle of 314electrically heated rods, with a total power of 2.5 MW, corresponding to 10% of thescaled nominal power. The primary pressure Is limited to 4.5 MPa. Regarding thelimited pressure of the PKL III test facility the scaling of the experiments falls intothree general categories:

The first category of experiments provides an insight into special physicalphenomena, such as CCFL or the influence of nitrogen, which are expected totake place in PWR's at pressures below 4.5 MPa. The second category concernsexperiments "enteringa a PWR-transient at a pressure level of 45 bar. Theconditions in PKL at the start of such a test are set up using code-calculations forthe PWR, an example being small break LOCAs, where the important phenomenaoccur at pressures below 50 bar. The third category covers scenarios wherephenomena occurring at high pressures in PWR's can be simulated at pressuresbelow 50 bar in PKL, with the results being extrapolated to the original pressure(with the help of codes or comparisons with experimental results from full-pressuretest facilities).

The test facility is equipped with all important safety and auxiliary systems, e.g.volume control system, high and low pressure injection system, accumulators andresidual heat removal system. In correspondence to KWU-type plants, fourindependent high and low pressure injection systems which are connected to boththe hot and cold legs are simulated.

The arrangement of the test facility is shown in Fig 2.1,

The steam generators of the test facility are equipped with U-tubes. Each SG has27 heat exchanger tubes in accordance to the 1:145 scale. The tubes arearranged to assemblies with 7 different lengths. The peak elevations of the longestand shortest tube correspond to the plant dimensions. Two replacement bodiesare inserted in the secondary side to achieve the volume scale. A cross-sectionalview is given by Fig. 2.2.

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At least 3 U-tubes in each SG are equipped with thermocouples for the

measurement of primary side fluid temperature at different axial positions. The

axial location of these thermocouples is shown in Fig. 2.3.

Within the test facility there are more than 1300 locations for measurementinstrumentation. This provides extensive information necessary for the

understanding of all relevant thermal hydraulic phenomena.

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3 Description of Experiment PKUII B4.3

3.1 Objectives of Test PKLIII B4.3

Beginning by January 1989 the test series IIIB was initiated at the PKL testfacility. Focused on accident-management procedures the majorities of tests wereperformed in order to investigate phenomena occurring during primary side andsecondary side feed and bleed procedures. Within PKL III B4 three tests havebeen performed to investigate plant performance with presence of non-condensables in the primary system.

The investigation of the influence of non-condensables on plant performance wasconsidered to be meaningful, because accident scenarios exist where nitrogen orhydrogen accumulates in the steam generators and reduces heat transfer to thesecondary side. Nitrogen may be expelled by the accumulators in the cause of anpostulated Large Break Loss-of-Coolant Accident. It is dissolved in the primarysystem coolant, in the liquid of the refueling storage tank, and accumulator liquid,or may be already present in the system during refueling. And hydrogengenerated by metal-water reaction at the fuel cladding may accumulate in thesteam generators during post-design accident scenarios.

In the test series primary pressure (1 MPa) and power generation rate (2 %,ý) havebeen kept constant whereas primary side inventory was different in each test. InTest B4.1 the primary inventory was 100 % and thus the influence of non-condensables on single-phase natural circulation was investigated. In Test B4.2the primary inventory was set to 85% which generated two-phase naturalcirculation. And in Test B4.3, by a further reduction of the inventory down to 35%the influence of non-condensables on reflux-condenser conditions wasinvestigated.

Descriptions of the PKL test facility and of experiment PKL III B4.3 is given inreference /1/ through /3/

3.2 Initial and Boundary Conditions of the Test B4.3

The test was initiated by a conditioning phase where the primary inventory hasbeen already reduced, but no nitrogen was injected.

The reflux condenser conditions resulted in an accumulation of liquid inventory inthe hot legs and in the inlet regions of the SG tubes. In the hot leg a collapsedlevel of 1.2 m was observed. The collapsed levels in the tubes were 1.5 m. Theswell level in the vessel was below the inlet junctions of the loop pipings. The loopseals were filled with water.

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With the secondary side pressure (and saturation temperature) given, the primary

side pressure is a system response. The primary side pressure is established to

generate the temperature difference, which is necessary for stationary heatremoval. In the experiment under consideration the temperature difference was

6K.

Based on a secondary side energy balance it can be concluded, that about

460 kW are transferred to the secondary side. Consequently, the primary side heat

losses are about 60 kW. On the secondary side there is a heat loss of

approximately 10 kW per SG.

The major parameters of the stationary conditions in the primary system are

summarized in Table 3.1, the secondary side conditions are summarized in Table

3.2.

Primary Inventory 35%

Power 2 % (520 kW)

Primary Pressure 1.0 MPa

Core Outlet Temperature 453 K / 180 °C (saturated)

Main Coolant Pumps not operating

Pressurizer isolated

Primary/Secondary Side Temperature Difference 6 K

Tab. 3.1: Primary System Initial Conditions

Collapsed Level in SG Downcomer 12 m

Steam Une Pressure LBA 10-40 0.87 MPa

Steam Line Temperature 447 K / 174 °C

Feed Water Mass Flow LAB 10-40 0.05 kg/s I loop

Tab. 3.2: Secondary System Initial Conditions

3.3 Sequence of Events

Test PKLIII B4.3 investigates the system's response to a succession of nitrogen

injections periods into the primary system at various injection ports. In the course

of the test the secondary pressure was reduced occasionally in order to

compensate the Influence of nitrogen on heat removal in the steam generators.

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The sequence of nitrogen injection periods and secondary side pressureoperations is given in Table 3.3:

Time Event

0- 3600 s(10990 - 14590 s)

4870- 6310 s

(15860 - 17300 s)

6400 - 10000 s

(17390 - 20990 s)

10880 - 11180 s

(21870 - 22170 s)

14295 - 14595 s

(25285 - 25585 s)

14735 s (25725 s)

16000 - 19600 s

(26990 - 30590 s)

(21430 s)

22840 - 26440 s

(33830 - 37430 s)

27340 s (38330 s)

(38990 s)

1. period of nitrogen injection

0.25 Nm 3 , 3600 s, HL 10


0.1 Nm 3 , 1440 s, CL 30

0.25 Nm 3 , 3600 s, CL 30


0.25 Nm 3 , 300 s, HL 20


0.25 Nm 3 , 300 s, CL 40

reduction of secondary pressure to .80 MPa


1.5 Nm 3 , 3600 s, HL 10

reduction of secondary pressure to 0.55 MPa


1.5 Nm 3 , 3600 s, CL 30

reduction of secondary pressure to 0.37 MPa

End of Test

Tab. 3.3: Nitrogen Injection Periods and Secondary Side Pressure Settings

The amount of nitrogen which is injected in each of the first four periods

corresponds to the amount which Is dissolved In the accumulator liquid. Duringeach the fifth and sixth period of injection the full depletion of a accumulator

gaseous inventory was simulated.

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3.4 Phenomenological Analysis of Test Results

This chapter analyses the phenomena which occurred during the test and

describes

- the effect on heat transfer in the steam generator during reflux condenser

mode if nitrogen is present in the primary system,

- the overall distribution of nitrogen in the primary system depending on thelocation of an injection

- and the dependence on the primary to secondary side pressure and

temperature difference.

A detailed description of the test results will be given later in this report in

conjunction with comparison to calculational results.

The reflux condenser mode is characterized by counter-current flow of liquid andsteam in the hot leg. If nitrogen is Injected into the primary system, it istransported by convection (diffusion is not effective). At locations of lowertemperature, such as the steam generator or reactor coolant pump, steam iscondensed and nitrogen is subsequently accumulated. The quality of nitrogen isincreased until the partial pressure of steam and its saturation temperaturecorresponds to the saturation pressure of the local temperature (e.g. secondaryside). These conditions represent a thermal equilibrium, and no heat transfer or

condensation occurs in such a passive area.

The transition from an active heat transfer area to a passive heat transfer area isaccelerated by the phenomenon that the inert gas is accumulated at thecondensation film on the cooling surface. The density of the inert gas in thisboundary layer is higher than in the center of the steam flow. For this reason thepartial pressure and the temperature of the steam in the nitrogen enriched layer islower than the average steam temperature and partial pressure in the steam flow.After the termination of the condensation the layer of accumulated inert gas isdispersed by diffusion.

The distribution of nitrogen in the primary system depends on the location ofinjection. If a moderate amount of nitrogen is injected into a hot leg of the loop ofthe test facility, it is transported to the adjacent steam generator where anaccumulation at the location of condensation takes place. A "region of inertnessror passive area is established. It proceeds from the SG outlet chambers anddepending on the amount of nitrogen injected, can occupy the whole steamgenerator. If the hot leg is completely filled, nitrogen flows to the upper plenumand into the other hot legs. However under these conditions no permanentaccumulation of nitrogen was observed in the upper plenum. The distribution of

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nitrogen does not depend significantly on the injection rate but only on the totalamount of injected nitrogen.

If a moderate amount (0.25 Nm3 in 1h) of nitrogen Is injected into the cold leg,under reflux condenser conditions it is accumulated in the adjacent pump, as heatlosses dominate in this component and steam is accordingly condensed. If morenitrogen is injected or if the injection rate is high, nitrogen is transported via thebypass from the downcomer into the upper plenum and finally into the steamgenerators.

The influence of nitrogen on heat transfer in the SG tubes can be compensatedby lowering the secondary pressure or increasing the primary pressure. Theresulting increase of temperature difference between primary and secondary sidehas a direct impact on heat transfer. In addition the partial pressure of steam isdiminished via the accumulation of nitrogen. Therefore the concentration ofnitrogen can be higher. By an increase of primary pressure the region of inertnessis compressed and establishes thus a additional partial recovery of the heattransfer.

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4. Results of RELAPS/Mod 3.2 Analysis

4.1 Description of RELAPS/Mod 3.2

The Mod3.2 version of RELAP5 has been developed within the Code Applications

and Maintenance Program (CAMP).

The code development has benefitted from extensive application and comparison to

experimental data in test facilities such as LOFT, PBF, Semiscale and NRU.

RELAP5 is a highly generic code, that can be used in both nuclear and non-nuclear

systems involving mixtures of steam, water, non-condensables, and nonvolatilesolute.

A description of RELAP5/Mod3 is given in reference /4/.

4.2 Description of Input Model

The nodalization scheme Is shown in fig. 4.1.

The core area is represented by a single axial flow channel with 8 hydraulic volumes

in the heated region. The fuel rod simulators are represented by 3 heat structures(HST-1 0421, HST-1 0422 and HST-1 0423) with different power generation rates given

by General Tables 801-803. In the test facility the downcomer consists of two pipes.

In the RELAP input they are modeled as a single pipe.

Though being rather coarse, the modeling of the test vessel corresponds to the

requirements of Test PKLIII B4.3, as the phenomena under consideration occur in the

SGs and the loops, and as no core uncovery occurs during the course of the

experiment.

Each loop is modeled separately. The hot leg is represented by 13 hydraulic volumes.

Three types of SG tubes with different lengths are modeled (18, 20, 22 volumes). The

loop piping between SG and pump is represented by 16 volumes, piping between

pump and vessel by 5 volumes. The modeling of the piping and the steam generators

is sufficiently fine to allow an adequate representation of thermal-hydraulic

phenomena relevant in the test under consideration.

The pumps are represented by pump components; homologic data are used, which

have been determined for the LOB! test facility. The cooling of the pumps is

considered.

The noding of the steam generator secondary side has 16 axial nodes in the riser and

13 axial nodes in the downcomer.

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The nitrogen injection is simulated at the hot and cold injection port of the

emergency core cooling system. To consider the flow direction of these nozzles

towards the RPV, the injection junctions are connected to the outlet of the

volumes in the hot legs and to the inlet in the volumes of the cold legs.

The input deck includes a variety of control variables (cv). The following table

comprises control variables which are of particular interest for test PKL Ill B4.3.

Total power cv 7900

Drained mass of primary system cv 7500

SG collapsed levels cvs 2103, 2203, 2303, 2403

Smoothed levels in the SGs, calculated by a cvs 2110, 2210, 2310, 2410

Lag component with a Lag time of 30 s

Sum of the heat transfer in the short, medium cvs 7175, 7275, 7375, 7475and long SG tubes of all SGs

Smoothed heat transfer in the SGs, calculated cvs 7176, 7276, 7376, 7476by a Lag component with a Lag time of 50 s

4.3 Catculational Procedures and Boundary Conditions

The post test calculation was started to reach steady-state conditions with a

significantly reduced primary inventory. A calculation was made to meet the initialand boundary conditions. During the calculation 1491 kg of liquid inventory was

drained from the primary system and the inventories in the SGs were adjusted by

controlling feed water flow and secondary pressure. The calculation for steady

state was stopped after 5000 s. At that time the thermal-hydraulic conditions have

been almost stationary.

As a boundary condition during the transient nitrogen was Injected into hot legs 10

and 30 and cold legs 20 and 40. These injection rates are shown In Fig. 4.2 and

4.3.

As the heat transfer in the SG depends on the pressure difference and is merely

independent from the absolute pressure, during the calculations the secondaryside pressure was used in correspondence to the experiment as a calculational

boundary condition. The development of the secondary side pressure is shown in

Fig. 4.4.

Additional to these presumptions the input was fitted out with control variables to

get the nitrogen accumulation and nitrogen flow in the primary system. Together

with the heat transfer to the secondary side the results of the RELAP5/Mod3.2

analysis were assessed against the experimental results.

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4.4 General System Response

The overall system response to nitrogen injection is depicted in Fig. 4.5 through

Fig. 4.7.

At first the measured system behavior is discussed.

Fig 4.5 shows the pressure history of primary and secondary side. The pressureincrease following the 1. period of nitrogen injection into HL10 (0 - 3600 s) is very

moderate. The 2. period of injection into CL30 (4870 - 10000 s) has no effect onprimary system pressure. The pressure increase during the 3. injection period intoHL20 (10880-11180 s) is more pronounced than in period 1. At the end of

injection period 4 the secondary side pressure is reduced for the first time and

generates a simultaneous decrease of the primary side pressure. The subsequentinjection period 5 with large amounts of nitrogen results in an continuous increase

of primary pressure which was compensated at the end of this injection period by

a further adjustment of the secondary side pressure.

The pressure difference between the primary and secondary side results in a

difference of the corresponding saturation temperatures, which determines the

overall heat transfer. The history of calculated and measured temperatures andtemperature difference is shown in Fig. 4.6 and 4.7. The initial temperaturedifference before nitrogen injection calculated by RELAP5/Mod3.2 is 4 K

compared to 6 K in the experiment. The temperature decrease on the secondaryside shown in the experiment during the first period Is to be explained by a local

effect (plume of cold water at the thermocouple).

The temperature difference which is formed at the end of each injection period

is summarized in the following table:

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Experiment RELAP

pro pressure post pressure pro pressure post pressure

reduction reduction reduction reduction

Initial Condition 6 K * 4 K

1. Period (HL 10) 6 K * 5 K

2. Period (CL 30) 6.5 K 5K *

3. Period (HL 20) 8 K * 7K *

4. Period (CL 40) 8 K 9 K 7 K 8 K

5. Period (HL 10) 19 K 23 K 18 K 25 K

6. Period (CL 30) 27 K 30 K 30 K 42 K

* no pressure reduction performed

Tab. 4.1: Measured and Calculated Temperature Differences between Primaryand Secondary System in Test PKL III B4.3

For the temperature differences shown in table 4, the primary temperature is takenfrom the upper plenum as calculated and measured, respectively, and thesecondary temperature (for the calculation the same as for the experiment)Fig. 4.6) corresponds to the secondary saturation pressure.

Injections of small amounts of nitrogen into a cold leg do not affect heat transferto secondary side. For the 5m (hot leg injection) and 6m (cold leg injection) injectionperiods, heat removal was too small to generate a stationary condition. This non-equilibrium resulted into an almost constant pressure increase. At the end of eachof both periods, secondary side pressure has been reduced in the experiment.The first temperature difference corresponds to secondary side pressure beforereduction, the second temperature difference Is the respective value afterpressure reduction. As primary side pressure follows the secondary side pressure,the reduction of pressure in the primary system results into an extension of thevolume of inertness (passive area) in the steam generators. Therefore thetemperature difference between both systems is expected to be higher with alower pressure level.

In the following the RELAPS results are compared to the measured values.

During steady state (before injection of N into the system) RELAP5 shows a lower(50%) temperature difference between primary and secondary side (Fig. 4.7, 4Kcalculated by RELAP5, 6K measured), although the total heat transferred to thesecondary side is calculated to be lower in RELAP5 than in the experiment

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(440 kW vs. 460 kW). This indicates a small overestimation of heat losses on theprimary side in the RELAP5 model.

For the first period (nitrogen injection of 0,25m" In 1 hr into HL1 0) RELAP5calculates a small response of the system behavior (AT increase by 1K to 5K); the

measured system response cannot be clearly Interpretated, because of the shown

anomalies (Fig. 4.6) but indicates almost no increase of the primary temperatures.The RELAP5 results (AT increase) show that the decrease of heat transfer in

SG 10, because of nitrogen injection, cannot be compensated completely by the

remaining SGs (as in the experiment).

Both the experiment and RELAP5 show almost no influence of the nitrogeninjection of 0,25m2 N in I hr into CL30 on the system behavior during the 2nd

period.

In the 3' period (0,25m3 N in 5min into HL 20) RELAP5 shows a similar system

response to the nitrogen injection as measured (1,5K vs 2K).

In the 4h period with 0,25ms nitrogen Injection In 5min Into CL40 both RELAP5 and

the experiment show no system response. Experiment and RELAP5 define an

increase of 1K of the primary temperature after the depressurization.

During the 5* and 6e period of nitrogen injection, RELAP5 and the experimentshow a continuous increase of primary pressure and consequently an increase of

the temperature difference primary to secondary side, which are terminated by the

secondary side depressurization.

4.5 Steam Generator Heat Transfer as a Function of NitrogenDistribution in the Primary System

The distribution of nitrogen and its influence on steam generator heat transfer was

analyzed. The heat transfer in the SG depends on the distribution of nitrogen in

the U-tubes.

In the RELAPS/Mod 3.2 calculation, the nitrogen accumulations in all relevantcomponents can be shown using control variables. These control variables serve

as a basis to analyse the nitrogen transport. The calculated nitrogen distribution is

depicted in Fig. 4.12 through 4.37 in comparison to the experimental values. The

nitrogen mass distribution of the experiment shown in the figures is estimatedfrom the test report description. Additional the heat transfer of the individual SGs

can be derived from the live steam flows, hence these values are proportional to

the heat transfer, when the level in the SG secondary side is kept constant by thefeedwater injection (see Fig. 4.38). The heat transfer in the SGs of the calculation

was derived directly via the heat flux parameters of the U-tubes (see Fig. 4.39).

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Consequently the calculated heat transfer of each SG can be compared with theexperiment. (Figures 4.40 through 4.43), based on the nominal heat transfer rate

in one SG of about 115 kW. When the heat transfer declines in a SG byaccumulation of nitrogen, the inertness is compensated by the Increase of thesteam temperature in the primary system, which leads to a better heat transfer inthe SGs which are free from nitrogen.

Fig. 4.37 confirms a good agreement of the integral nitrogen inventory in thesystem between experiment and calculation and the correctness of the boundaryconditions. Differences between calculated and measured heat transfer can be

explained via the calculated differences In nitrogen distribution.

1" Nitrogen Iniection of 0.25m3 into the Hot Leg of Loop 10 in lhr

The experiment shows the following: During the 1" nitrogen injection period(Fig. 4.2) the heat transfer in SG 10 decreased (Fig 4.40) from the initial value to

20kW. The development of a passive area in the SG1O can be seen in Fig. 4.8and 4.9. The total mass of 0,3kg N injected is accumulated in HL1O and in SG10(Fig. 4.12 to 4.13). To preserve the total heat removal the heat transfer in the

other SGs increased (see Fig. 4.41 to 4.43) without a pressure and temperature

increase in the primary system (Figs 4.5, 4.6).

RELAP5 shows the following: The heat transfer in SG 10 decreased from 110kW

to less than 10kW at 1200 sec (Fig. 4.40). This loss of total heat transfer of about

100kW (compared to approx. 40kW in the test) cannot be compensated by the3 other SGs without a small temperature and pressure increase at the primaryside (Figs 4.5, 4.6). The evaluation of the nitrogen distribution shows that less N isaccumulated in SG10 compared to the experiment (Fig. 4.13). The increase of

pressure in the upper plenum and at the SG outlet leads to oscillatory loop sealclearing (Fig. 4.44) and consequently to the N transport to the RCP

(Fig. 4.15, 4.16).

2V Nitrogen Injection of 0.25 ma into the Cold Leg of Loo 30 in 1 hr

The experiment shows no significant change of heat transfer in all 4 SGs

(Figs 4.40 to 4.43) during the N injection. The nitrogen injected is accumulated in

the DC only (Fig. 4.36).

The RELAP5 calculation shows also no significant change in overall heat transfer.

SG10 recovers slightly around 8000 sec to about 40kW heat transfer (Fig. 4.40).The nitrogen distribution calculated differs from the experimental results. RELAP5calculates a nitrogen flow to the UPL and closure head (Fig. 4.36), which is an

indication of an underestimation of condensation in the pump region, resulting in

positive pressure difference CL to UPL and closure head.

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3V Nitroaqen Injection of 0,25m3 into the Hot Leg of Loop 20 in 5 min

The experiment shows a significant decrease of heat transfer in SG20 to 60kW

(down from 140kW) (Fig. 4.41). This decrease Is compensated by a permanentincrease of heat transfer in SG30 from 160kW to about 230kW (Fig. 4.42). Beside

short peaks, SG10 and SG40 remain unaffected. The nitrogen accumulates

primarily in the SG20 and partly in the loop between SG20 outlet and loop seal.

The RELAP5 calculation shows a much stronger decrease of heat transfer downto 0 in SG20 with a continuous recoverment thereafter (Fig. 4.41). SG30 and

SG40 show an increase from 140kW to 160kW and a continuous decreasethereafter. SG10 shows a permanent increase of heat transfer from 40kW to130kW (no increase In the test). Fig. 4.23 shows that not all Injected nitrogen is

calculated to accumulate in the SG20, it partly flows towards the UPL. The

amount of nitrogen In SG20 decreases continuously (Fig. 4.20), thereby causing

an increase of heat transfer (Fig. 4.41).

4W Nitrogen Injection of 0,25m3 into the Cold Leg of Loop 40 in 5 min

The experiment shows no significant change of heat transfer in any of the 4 SGs

before the depressurization (Figs 4.40 to 4.43). The secondary pressure decreaseleads to a temporary peak of heat transfer In all 4 SGs. The nitrogen is

accumulated in DC region only.

The RELAP5 calculation shows also no significant response of the system till thedepressurization. Only SG20 shows a significant reaction during the

depressurization. The nitrogen is calculated to accumulate first primarily in the DCand partly in the UPL. Thereafter it is redistributed from the DC region into UPLand the rest of the primary system (Fig. 4.36).

5" Nitrogen Injection of 1.5ms Into the Hot Leg of Loop 10 in lhr

The experiment shows no overall change in heat transfer during the injection

period (Figs 4.41 to 4.43). SG30 shows a decrease and a consecutive increase,whereas SG40 shows in the same time period an increase and a decrease ofheat transfer. The actual decrease of heat transfer by condensation in the U-tubes

is compensated by a continuous Increase of primary pressure and corresponding

saturation temperature (Fig. 4.5). The nitrogen accumulates in all 4 SGs inparallel (Figs 4.13, 420, 4.27, 4.32). The pressure reduction creates similarreactions like in period 4.

RELAP5 calculates a similar overall system response regarding the total heattransfer and pressure increase in the primary system (Fig. 4.5 and 4.40 to 4.43).

SG10 looses completely its heat transfer capacity during the injection. SG20

reaches full capacity (up to 160kW) again and SG30 and SG40 increase also their

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heat transfer by 20kW. The nitrogen is calculated to increase in all 4 SGs similarto the experiment.

6h Nitrogen Injection of 1,50 into the Cold Leq of Loop 30 in 1 hr

The test shows a strong decrease of heat transfer in SG30 at 2400 sec down toabout 80kW. The other 3 SGs raise their heat transfer. The actual decrease in thecondensation rate in the SG U-tubes is compensated by a continuous increase ofprimary pressure and corresponding saturation temperature. The nitrogen isaccumulated in all 4 SGs in parallel (Figs 4.13,420,4.27,4.32).

The RELAP5 calculation shows a comparable result regarding the primarypressure response (Fig. 4.5). SG20 and SG30 have a higher calculated heattransfer compared to the test, whereas SG40 has a lower calculated value. Thenitrogen is calculated to increase in SG20, 30 and 40 but remains nearly constantin SG10.

Conclusion

In this chapter we have discussed the nitrogen distribution in the PCL and theinfluence on the heat transfer in the SGs during the 6 nitrogen injection periods.

Comparing the nitrogen distribution in the system between the experiment and theRELAP calculation significant differences were shown in the results. In the RELAPcalculation, the nitrogen was accumulated at the measured locations but to adifferent amount. The U-tubes of the SGs were calculated to receive enough inertgas to influence the heat transfer as predicted in the experiment.

The overall heat transfer response Is predicted by RELAP5 in a similar waycompared to the test. But differences are shown in the distribution of the heattransfer among the SGs. In the experiment the heat transfer differs from 60 kW toabout 250 kW (Fig. 4.38), while in the RELAP calculation the heat transfer rate isat a uniform level near 150 kW, but for the SGs with passive areas (Fig. 4.39).

4.6 Propagation of Nitrogen Concentration In the Steam GeneratorU-Tubes

Based on the evaluation of the experiment for reflux condenser operation with ahot injection of nitrogen, in the course of this test a front of high nitrogenconcentration is formed in the SGs, which moves through the SG from the outletchamber to the inlet chamber. An indication for this movement is themeasurement of fluid temperatures in the SG tubes (see Figs 4.8 to 4.11),because steam temperature in this region decreases according to the partialpressure. In the evaluation the presence of nitrogen in the U-tubes of the SGs hasbeen verified in this manner.

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As described in chapter 4.5 the heat transfer In SG 10 and SG 20 did not exactly

correspond with the prediction of the experiment. These SGs were effected by hotleg nitrogen injection during the periods 1 and 3. In the experiment they showed aconstant heat transfer of about 10 kW resp. 60 kW after the 3'd injection period

(Figs 4.40, 4.41). In the RELAP analysis, SG 10 was activated again whennitrogen was injected into the hot leg of loop 20 and the heat transfer in SG 20collapsed totally. Later on, in SG 20 the heat transfer increased continuously to

about 150 kW after the termination of the 3'= nitrogen injection.

This calculated Increase of the heat transfer in the RELAPS/Mod 3.2 analysis is

not shown in the experiment and should be analysed closer. As the phenomena ineach U-tube are similar, only results of the longest tube of SG 10 and 20 are

presented here.

When condensation takes place in the U-tubes, heat is transferred to the

secondary side. Another criterion for heat transfer Is the temperature differencebetween the steam in the U-tubes and the secondary side of a SG. In figures 4.8

through 4.11 steam temperatures and secondary side temperatures are depicted

for the ascending and descending U-tubes. The temperature differences confirmthe heat transfer shown by the steam condensation in the figures 4.49 and 4.50.

Furthermore the temperature differences between the saturation temperaturesand the steam temperatures in figures 4.8 through 4.11 indicate the presence of

nitrogen in the U-tubes as predicted in the experiment.

Figures 4.49 and 4.50 of the RELAP calculation show the generation of

condensate in the respective SG for the ascending and descending U-tubes. Aspredicted in the test, the condensate generation in the descending part decreased

earlier than in the ascending tubes, caused by concentration of nitrogen duringcondensation of steam and by the flow of nitrogen from the ascending part to the

descending part together with steam.

At 1000 s, generation of condensate in the descending U-tubes of the SG 10

(Fig. 4.49) has been stopped totally by reaching a saturated state of the mixture.

At 4000 s in SG 10 the nitrogen Inventory in the descending part decreased while

it was constant in the ascending tubes (RELAP calculation, Fig 4.17). The reason

for this behavior shows the integral nitrogen flow at the Inlet and outlet of pipe 320(RELAP calculation, Fig. 4.18). Nitrogen that flowed to the loop seal (RELAP

calculation, Fig. 4.14) has been withdrawn from the ascending U-tubes. The same

behavior of the RELAP calculation showed SG 20 at 11500 s (Figs 4.24, 4.25).

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Therefore the heat transfer behavior calculated by RELAP5 of SG1O and SG20after nitrogen injection into their corresponding hot legs can be explained by thenitrogen transport out of the SG U-tubes into SG outlet and the adjacent loop.

In the experiment the nitrogen obviously remains in the U-tubes of the affectedSG (see Figs 4.13, 4.14 and 4.20, 4.21).

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5 Conclusions

The PKL III test facility simulates a typical 1300 MWe pressurized water reactor of

Siemens/KWU design. In Test B4.3, the influence of non-condensables on reflux-

condenser conditions was investigated.

This report presents a post-test analysis of PKL III B4.3 using RELAP5/Mod 3.2.A description of the input model is given, and the correspondence of measuredand calculated results is discussed.

The main findings of the comparison of RELAP5/Mod 3.2 results with the PKLIIIB4.3 experiment are as follows:

The general system response (pressure, temperature) of nitrogen injection in theprimary system Is calculated by RELAP5/Mod3.2 quite well. In a detailedevaluation RELAPS calculates a non conservative behavior of heat transfer for

small nitrogen injections effecting a particular SG. This statement can be

concluded from the course of the heat transfers in the SGs 10 and 20 ( seechapter 4.5 and 4.6).Thus a too large calculated heat removal from the primarysystem underestimates the effect of nitrogen on the emergency core cooling in

loss of coolant accidents. When the steam flow of the reflux condenser operationis terminated in a SG caused by inertness, less nitrogen of the injection istransported to the SG U-tubes. For this reason first a smaller nitrogen inventory in

the U-tubes of a SG has been calculated to accumulate as predicted in theexperiment and later on the nitrogen has been calculated to leave the SG

(chapter 4.6).

Looking at the figures of the transient, it is shown that RELAP calculates small

fluctuations which transport nitrogen in the system without physical background.In a long term behavior, because of this numerical instability RELAP will predicta homogenous distribution of the nitrogen in the primary system.

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References/I/ K. Umminger et al

Station Blackout Experiment in PKLIII Test Facility and RELAP5/MOD2AnalysesICONE-3, Kyoto Japan, April 1995

/2/ P. Weber et al.PWR-Related Integral Safety Experiments in the PKUII Test Facility -SBLOCA under Beyond-Design-Basis Accident ConditionsNURETH-7 Saratoge Springs, USA. Sept 95

/31 B. Schoen, P. WeberLarge Scale Experiment on Two-Phase Flow and Heat Transfer withNitrogen in a Steam Generator under SBLOCA ConditionsInt. Symposium on Two-Phase Flow Modelling and ExperimentationRome, Italy, OcL 1995

14/ Idaho National Engineering LaboratoryRELAP5IMOD3 Code ManualNUREG/CR-5535 INEL-9510174 Vol. I - VII

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List of Figures

Fig. Text

2.1 View of PKLIII Test Facility2.2 Cross-Sectional View of a PLK IIl Steam Generator2.3 Axial Locations of Thermocouples in SG tubes4.1 Nodalization of the PKL III Test Facility with Respect to the B 4.3 Experiment4.2 Nitrogen Injection Rate into Hot Legs 10 (X) and 20 (- -)

4.3 Nitrogen Injection Rate into Hot Legs 30 (X) and 40 (- -)4.4 Secondary System Pressure RELAP (X), Experiment (+)4.5 Primary Pressure RELAP (X), Experiment (Z), Secondary Pressure RELAP (+),

Experiment (Y)4.6 Primary Temperature RELAP (X), Experiment (Z), Secondary Temperature

RELAP(+), Experiment(Y)4.7 Temperature Difference Primary-Side - Secondary-Side RELAP(X), Experiment(+)4.8 Fluid Temperature SG 10, Ascending U-tubes RELAP(X), Experiment(+),

Level 0.3m, Saturation Temperature Secondary Side(Z),Saturation Temperature Primary Side(Y)

4.9 Fluid Temperature SG 10, Descending U-tubes RELAP(X), Experiment(+),Level 0.3m, Saturation Temperature Secondary Side(Z),Saturation Temperature Primary Side(Y)

4.10 Fluid Temperature SG 20, Ascending U-tubes RELAP(X), Experiment(+),Level 0.3m, Saturation Temperature Secondary Side(Z),Saturation Temperature Primary Side(Y)

4.11 Fluid Temperature SG 20, Descending U-tubes RELAP(X), Experiment(+),Level 0.3m, Saturation Temperature Secondary Side(Z),Saturation Temperature Primary Side(Y)

4.12 Nitrogen Mass Loop 10 Hot Leg + SG Inlet4.13 Nitrogen Mass Loop 10 Steam Generator U-tubes4.14 Nitrogen Mass Steam Generator 10 Outlet to Half Loop Seal4.15 Nitrogen Mass Loop 10 Half Loop Seal to RPV Inlet4.16 Integrated Nitrogen Injection Loop 10 Hot Leg(Z), SG-Side(X), RPV-Side(+)4.17 Nitrogen Mass SG 10, Pipe 320 Ascending(X), Descending(+) U-tubes4.18 Integrated Nitrogen Mass Flow SG 10, Pipe 320 Inlet(X), Outlet(+)4.19 Nitrogen Mass Loop 20 Hot Leg + SG Inlet4.20 Nitrogen Mass Loop 20 Steam Generator U-tubes4.21 Nitrogen Mass Steam Generator 20 Outlet to Half Loop Seal4.22 Nitrogen Mass Loop 20 Half Loop Seal to RPV Inlet4.23 Integrated Nitrogen Injection Loop 20 Hot Leg(Z), SG-Side(X), RPV-Side(+)4.24 Nitrogen Mass SG 20, Pipe 420 Ascending(X), Descending(+) U-tubes425 Integrated Nitrogen Mass Flow SG 20, Pipe 420 Inlet(X), Outlet(+)4.26 Nitrogen Mass Loop 30 Hot Leg + SG Inlet4.27 Nitrogen Mass Loop 30 Steam Generator U-tubes4.28 Nitrogen Mass Steam Generator 30 Outlet to Half Loop Seal

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4.294.304.314.324.334.344.354.364.374.384.394.404.414.424.434.444.454.464.474.484.494.50

Nitrogen Mass Loop 30 Half Loop Seal to RPV InletIntegrated Nitrogen Injection Loop 30 Cold Leg(Z), RPV-Side(X), SG-Side(+)Nitrogen Mass Loop 40 Hot Leg + SG InletNitrogen Mass Loop 40 Steam Generator U-tubesNitrogen Mass Steam Generator 40 Outlet to Half Loop SealNitrogen Mass Loop 4 Half Loop Seal to RPV InletIntegrated Nitrogen Injection Loop 40 Cold Leg(Z), RPV-Side(X), SG-Side(+)Nitrogen Mass Closure Head and UPL (X), DC(+), LPL Core and Core-Bypass(Z)Nitrogen Mass Primary System RELAP(X), Injected Nitrogen Mass(+)Heat Transfer Experiment SGs 10(X), 20(+), 30(Z), 40(Y)Heat Transfer RELAP (smoothed) SG 10(X), 20(+), 30(Z), 40(Y)Heat Transfer SG 10 Experiment(X), RELAP(+)Heat Transfer SG 20 Experiment(X), RELAP(+)Heat Transfer SG 30 Experiment(X), RELAP(+)Heat Transfer SG 40 Experiment(X), RELAP(+)Collapsed Level Loop Seal 10 SG-Side RELAP(X), Experiment(+)Collapsed Level Loop Seal 20 SG-Slde RELAP(X), Experiment(+)Collapsed Level Loop Seal 30 SG-Side RELAP(X), Experiment(+)Collapsed Level Loop Seal 40 SG-Side RELAP(X), Experiment(+),Collapsed Level RPV RELAP Core(X), DC(+); Experiment Core(Z), DC(Y)Condensate Generation SG 10, Pipe 320 Ascending(X), Descending(+) U-tubesCondensate Generation SG 20, Pipe 420 Ascending(X), Descending(+) U-tubes

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Figures

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Page 28

Abb. 2.1: View of PKLIII Test Facility

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00

E A

thermocouple SG tubereplacement bodies

Fig. 2.2: Cross-Sectional View of a PKL III Steam Generator

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Hobo (an].

Ebmen

Pro

MIEl/ MI/A

Kra*J/E.J10 -JlA

10310

99759635

86258290

6700

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2M0

1300

700

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0

-- - -

- -- Z

lIE

HI E

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GIL _ _ __ _

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EFnt.23 Anup sint

Fig. 2.3: Axial Locations of Thermocouples in SG tubes

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Page 31

Fig. 4.1 :Nodalization of the PKL III Test Facility with Respect to the B 4.3 Experiment

TN. rgIucfxI bath Uir•isson d cr USe @o Ihis docwmfih w Its Conitets Is noemiftisd wkh•ot sWess wftn affiMy. Ofaenders WKN be LOWe 1oWamagms AD dens, h"dedkg uts ustsd by paters grat or isvtizan

Siemens AG • Power Generation Group (KWU) o a u ,. odeo, am mre

L:KamerAod3b43_wrjr53.2_myidoc

H30-45314 Sercht KWU . Onq. 4.94 0

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C,)az

DOKU.98051 3.1842.14668

Mass Flow (kg/s)0.0012 . I T I I r

I I I

X-X MFLOWJO91000000L+---+ MFLOWJ921000000

0.0010-

I T . I

oL 0

0..

azEDa C

0.0008 .-I.... . .. - . . .. . . .. . . . .. ! ............ I... ............. . . .... ..

0.0006

0.0004

............ ..... .............. .... ............ .. . I ...... .. .. ._._..1.

........ . .. ..

7

U

0

!.UUUid. ."...

I.0

0i- ,2 4 6 8 12 14

Timej )Depress. dpW Inl•.•tInn

16 18 2)-

dp

5. h. leg 10

22 24 26

OP

28

1lh Ianl0 2. ¢. lisa 30 3.h.ioa2O 4.c.iea4O 6.oc. leg 30N Inlection I h le 10 2. c. lao 30 3. h. lea 20 4. c. Wo 40

Comparison of Experiment and Analysis PKL III B 4.3

Data b4_3 -- RELAP5/Mod3.2

Fig. 4.2: Nitrogen Injection Rate Into Hot Legs 10(X) and 20(--)

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a DOKU.980513.1 842.14668

I Mass Flow (kgls)

0.

CL

mii nlfll¶J~1~

0.0010

I - - - *-)< M1FLOWJ8O31000M0

........ ...... .. ......... .. ..... 4.1.r -_ _ ----- -I.....L . -.....................

0

z

ciCD

F

0.0008-

0.0006 7

i in, .& ............ .. 4..........4 ---- . .......----- -------i... ......... I.~......................4..............I.................4.................I

0.0002

0.0000

7 .... ...... ....... .. ................ . .......... .. ...... ..... ... ........... ................i ... ........ .. ... ........ ...........

,'0

I2 4

I

6 8r110 I

12 14Time 40

D.¢ eJ4

16 18 2dp

5. h. lea 10

221,

24 26 J28 "103

Depress. dp

N Infection 2. c.lea 30 3. h. lea 20dP

6. c. lea 30t. h. leg 10


Data b4_3 -- RELAP5/Mod3.2Fig. 4.3: Nitrogen Injection Rate into Cold Legs 30(X) and 40(- -)

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I DOKU.980513.1842.14668

Pressure (Pa)2.0-

1 .8 . .......................................

1.6.*106

1.4-. ...... .

1 .2 . ......................................

1.0 - .-.-----.

0.8--0 .8 . ... ............... ,....

0.6,-

0 .4o.-.o . .- ............

0.2 -

0.0- r'---t'0 2

Depress. dpN Inlection 1. h. leg 10

0

a

43

zP

z

m

•103

- Time ()

2. c.log 30 3. h.log 20 4. c.log 40dp

5. h. leg 10

dp

6. c. leg 30



Fig. 4.4: Secondary System Pressure RELAP(X), Experiment(+)

Dieses Blatt uO8 ter3egt den Wetergebebeschrf.nkungenwie aul Titelselte bzw. erster Selte angegeben


I DOKU.98051 3.1842.14668

CD

0

z

Cz

0~RD

I

-o==

Depress. dp

N Iniection

S 2 4 6 8 10 1'2 1 1'6 18 2' 22 24 2'6Tim_) dp dp

1. h. Ieg 10 2. c. leg 30 3. h. leg 20 4. c. Ieg 40 5. h. leg 10 8. c. g 30

*103


Data b4_3 -- RELAP5/Mod3.2Fig. 4.5: Primary Pressure R(X), Exp.(Z), Secondary Press. R(+), Exp.(Y)

Dieses Blatt unterliegt den Welergab1beschr6nkungenwie aul Titelselte bzw. erater Sell. angegeben


DOKU.98051 3.1842.14668X.

9f

aLz0

zaCO)CD

Depress. dp

6 8 10 12 141

2. c.leg 30 3.h. leg 20 4. c. leg 40rp rp

5. h.leg 10 6. c.leg 30

•103

L| | I ,I & . 1-. 4 ftIV liStl 5. II -MJ *. D



Fig. 4.6: Primary Temperature R(X), Exp.(Z), Second. Temp. R(+), Exp.(Y)

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I DOKU.98051 3.1842.14668

Temperature (K)60-r

amC

azaCOn

*103

Depress. dpN Iink~tinn

-'9,

1.hin~i1fl 2.c.Iea3O 3.h.Iea2O 4.c.lea4O 5.h.IealO 6. c. lea 30

Comparison of Experiment and Analysis PKL III B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.7: Temperature Diff. Primary-S. - Secondary-S. R(X), Exp.(+)

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Co

I

DOKU.98051 3.1842.14668X

f0

FL

0

z0

Cz0Ca

-a")

CR

1* 1' 141' 1,6 *1,8 ,2ý 2,2 *24 ,2,6Tm )hp dp dp

2. c. leg30 3. h.leg 20 4.C. leg 40 S.h.leg 10 6. c.lea 30Depress. dp

N Injection 1. h. leg 10

Comparison of Experiment und Analysis PKL III B 4.3Data b4,_3 - RELAP5/Mod3.2Fig. 4.8: SG 10 Aso. U-Tubes R(X), Exp.(+), Satt-sec(Z), Satt-pr(Y)

Dleses Blatt unterllegt den Weltergabebeschrankungenwie auf Tdelselte bzw. erster Selte angegeben


IDOKU.98051 3.1842.14668

Temperature (C)

CL

CD

5.*1---"X TEMPG320I8

195 ..... .. ..... ........... ..... . ................. .... ................................. ...... Z- SAT EMP74001Y-Y SATrEMP20001

1 9 0 .. .. . .. .. . . . . . - . .

175. -s . ., ....... _.--- - • -- ". ____••-

170 . . ..... ..... ................ .. .... .. .. .

165-" --

1 6 0 - - v .-w ....... ..................... ..... .. ......... . . .. [ "l - '

155"

150- r= I

(0

z0

CO)SA

-o

(0

2Bu z 4

Depress. dp

N Inlectlon

6 U

2. c. leg 30

1U 12'1h4)

16 1 2

dp

22 24 216 1 28•103

dp0. c. lea 301. h. leg 10 3. h. lea20 4. c.Lm 40 S. h. 1" 10

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.9: SG 10 Desc. U-Tubes R(X), Exp.(+), Satt-sec(Z), Satt-pr(Y)

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I DOKU.98051 3.1842.14668

Temperature (C)200-

3:CL0.Q.M0

CD

CL

0

0I

-0

Depress. dp

N Injectlon

10 1'2-1'41 -1'6 -18 -2't ' '2 24 '2*6Time~ (0 m

1. h. eloci1 2. c.log 30 3. h. log 20 4. c.log 40 5.h. log10 6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3

Data b4_3 - RELAP5/Mod3.2Fig. 4.10: SG 20 Asc. U-Tubes R(X), Exp.(+), Satt-sec(Z), Satt-pr(Y)

Dieses Blatt unte14egt den We6tergabebeschrAnkungenMie auf Titelselte bzw. erster Solle angegeben


Ia DOKU.98051 3.1842.14668X

Q.

5.

9T

,103

Depress. dp

N Inl~vef nn 1. h. lea 10 2. c.lea 30 S.h. lea 20 4. c. Iea40 S. h.ea10 a.C. lea 30

Comparison of Experiment und Analysis PKL Ill B 4.3

Data b4_3 - RELAP5/Mod3.2

Fig. 4.11: SG 20 Desc. U-Tubes R(X), Exp.(+), Satt-sec(Z), Satt-pr(Y)

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This document Is subject to the restrictionsset forth on the first or title page 25.5.98 7:18:11

()az

DOKU .980513.1842.14668

Mass (kg)I U., -,-,I

8z0

Got. 7U . .... .... ...... .. ................ ............ . .. ...... ......... ............. .. . . . . . . . . .

3.407 . ................... . ...

3 .3 5 1 . .. ... .. .... ......... .. .. . ..... ... . . ..... ....... ...... .. ..... ...I ...... ... . . .. . ..

€",1.I.U•'.

U. 'e

0.2

0.1

0.1

0.0

.... .. ......... ............ ............... i ... ..................... .... .............. ........ ... . ..... ........... _ , -- •..

5................. ...

0 -A-ll..-- --. * ----.- --

FV

IR£LAP riment iS

110.00 I~1~1~1

l

0 2 4I ý I ý I6 a

I

10I12 14i" 16 18 2ý

T M4)1S)dp4.c. lea 40 5. h.leal10

22 24 26 1 28 •103

Depress. dpN Inlw~nntn

dp8.c. lea 301. h. ieo 10 2.0c. lea 30 3. h. lea 20

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 - RELAP5/Mod3.2

Fig. 4.12: Nitrogen Mass Loop 10 Hot Leg + SG Inlet

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I DOKU.98051 3.1842.14668

Mass (kg)1.0-v

3:

CL

(0

'00iz0

zCO,

0 2 4 6 8 10 12 1'4. 16 18 2' 22 24 26`8lime (S) -

611 , dp dp1. h. leo 10 2. c. lea 30 3. h. lea 20 4. c. ei 40 5. h. leg 10 6. c. ea 30

Depress. dpN Inieetlon


Data b4_3 -- RELAP5/Mod3.2Fig. 4.13: Nitrogen Mass Loop 10 SG U-Tubes

r I

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zDOKU.98051 3.1842.14668

kMass~

CLU3

78

z0

0ca

"!30:

*103

Depress. dp

N Inlection


Data b4_3 - RELAP5/Mod3.2Fig. 4.14: N Mass SG 10 Outlet to half Loop Seal

Dleses Bistt unterlegt den Weitergebebeschrfnkungenwie auf Tlteiselte bzw. erster Seite angegeben

This document is subject to the restrictionsset forth on the first or title page 25.5.98 7:18:28

DOKU.98051 3.1842.14668

Mass0.

X

CL

z0

z-a

-o0R

Depress. dp

N Inlection

10 12 14 16 18 2( 22 24 26611me ~ - 111

_cGa dp h®2. c. lea 30 3. h. lea 20 4. c. lea 40 5. h. lea 10 6. c. lea 30

•103

1. h. lea 10



Fig. 4.15: N Mass Loop 10 half Loop Seal to RPV Inlet

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Cl)0z

DOKU.98051 3.1842.14668

Massi

9)M.5.)

00

zPCDi

.

z

(do

"a9)(.

Depress. dp

N Injection

Time~ (S)O

1. h.log 10 2. c.leg 30 3. h.log 20 4. c.log 40 5. h.log 10 S. c.log 30


Data b4_3 - RELAP5/Mod3.2

Fig. 4.16: Int. N Injection L. 10 Hot Leg(Z), SG-Side(X), RPV-Side(+)

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QzDOKU.98051 3.1842.14668

Mass0.4

(aY.0

0

C.

V0

CzUn

• 103

Depress. dp

N Inlectlon

Time)

2. c.lea 30 3. h. la 20 4. c.lea 401. h. leg 10

dp5. h. lea 10

dp

6. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.17: N Mass SG 10, Pipe 320 Ascending(X), Descending(+) U-Tubes

I.

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IDOKU.98051 3.1842.14668

Mass

X.

(0

aL

X1'z0

CI

-L

SD(0

111 1' 1'41 -1'6 18 I 24)Time (S) - -

2. c.leg 30 3. h. e20 4. c. leg 40 S.h.leg 10

•103

Depress. dp

N Infect•on 1. h. WQ 10dp

6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 - RELAP5/Mod3.2Fig. 4.18: Integr. N Mass Flow SG 10, Pipe 320 Inlet(X), Outlet(+)

Dieses Blatt unterdlegt den Weltergabebeschr~nkungenwie auf Titelselte bzw. erster Selte angegeben


CO

zDOKU.980513.1842.14668

Mass (kg)0.50-

0.45-... l

0.40-

0.35 .. ..........

0.30.

0.25.

0.20 .......

0.15 -

0.10- '---

0.05

0.00 -.- .-'---0 2

Depress. dp


CD

Q)

79

z0

0CDCD

to

6 8 10 12 14

2. c.leg 30 3. h. Ieg 20 4. c. leg 40

-10 3

dp5. h. leg 10

dpa. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.19: Nitrogen Mass Loop 20 Hot Leg + SG Inlet

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I DOKU.980513.1842.14668

Mass (kg)1.0

3)0

z

zaCA

M15)

*103

Depress. dp

1. h.log 10 2.c.log 30 3. h.log 20 4. c.leg 40 S. h.log 10 6. c. lg 30N Injection

Comparison of Experiment und Analysis PKL III B 4.3Data b4,_3 -- RELAP5IMod3.2Fig. 4.20: Nitrogen Mass Loop 20 SG U-Tubes

DOese1 Blatt unterlegt1 den WeltergebebeschrfinkungenWie suf Titelselte bzw. erster Selte angegeben

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I DOKU.98051 3.1842.14668

Mass0.

0.

0.

0.

0.

0.

0.

0.

0.

0.

0.

Depress. dp

N Inlectlon

"r

0.CL

0

z0

CzaCro

Time, 40

4. c. lsf 40

16 18 2?

dp5. h. leg 10

-103

1. h. leg 10 2. c. lea30 3. h. leg 20dp

6. C. M 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 - RELAP5/Mod3.2Fig. 4.21: N Mass SG 20 Outlet to half Loop Seal

Dieses Blatt unterliegi den Weilergabebeschr~nkungenwie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictionsset forth on the first or tite page 25.5.98 7:18:30

U)

zDOKU.9805 13.1842.14668

Mass0.,J

10

Iz

_L

RU

Depress. dp

N Inlection

6 a 10 12 141Tlme 6)

2. c. Ig30 3. h. lea20 4.c. lea 401. h. lea 10

• 103

dp5. h. lea 10

dp6. c. leg 30


Data b4_3 -- RELAP5/Mod3.2Fig. 4.22: N Mass Loop 20 half Loop Seal to RPV Inlet

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I DOKU.98051 3.1842.14668CL

C0

:0

*0

0

z0

C,,

10 112 1'4 '16 _1'8 '2' 2'2 '2'4' 2'6

1. h. 10l 2. c.lea 30 3. h.lea 20 4. c. len 40 5. h.leal10 6.0. Ma 30Depress. dp

N Infection

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.23: Int. N2 Injection L. 20 Hot Leg(Z), SG-Side(X), RPV-Side(+)

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I DOKU.980513.1842.14668

Mass (kg)1 0.09 .

xCLff

i

10

5I

6 81 10 12 14 116 18 2 22 24 26Time N) Ow

_ ap dp dp2. c. leg 30 3. h. leg 20 4. c. lg40 5. h. leg 10 6. c. leg 30

•103

Depress. dp

hi Inar~linn I h t,•nl0I h Is 10

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 - RELAP5/Mod3.2Fig. 4.24: N Mass SG 20, Pipe 420 Ascendlng(X), Descending(+) U-Tubes

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I DOKU.98051 3.1842.14668

Mass0.1

CL

3.

5.

0

z

CD-L

-103

Depress. dpN Innfi~tton

0 2 4 6 1-0 1-2 14

1. h. Ma 10 2. c. lea 3 3. h.ieg 20 4. c.lea 40

dp rip5. h.leg10 0. C. " 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.25: Integr. N Mass Flow SG 20, Pipe 420 Inlet(X), Outlet(+)

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zDOKU.98051 3.1842.14668

I Mass (kg)

CL

CL

p L.4 5 -- .*- -- * - . * .-- * ..........I. .. .. ...

0.35 - ---- ---- ------ - - - -..... .-.-........- *-- .- - ... ........

0..57 .........................................-.-..-.---.----.---.-------................................................................................................................

0 .2 5 . .............................. .......... .. .................... ....................... ................ ... ...... .......... ... ..... ..... ... ... .. .

0. 15 ----- _

0.05 -Expertm~t no N A vmulatlo

i2Z A' 06• 1 18

0.00 T

(D

0

zCO)

LD

0u

Depress. dp

N Injection 1. h. log 0 2. c.log 30 3. h.log 20 4. c.log 40 S. h.log 10

22 24 26 1 28

_______dp6. c. leg 30


Data b4_3 - RELAP5/Mod3.2Fig. 4.26: Nitrogen Mass Loop 30 Hot Leg + SG Inlet

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I DOKU.98051 3.1842.14668

Mass (kg)1.0 -r

CLCO

aM

CL

0

z0

z

I

Depress. dp

N Inlectlon

6 8 10 12 14

2. c. Ian30 3. h.lea 20 4. c.lea 40

•103

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 - RELAP5/Mod3.2Fig. 4.27: N Mass Loop 30 SG U-Tubes

DOeses Blatt unteriegt den Weitergabebe.chr6nkungenwie aul Titeiselie bzw. erster Su~e angegeben


I DOKU.98051 3.1842.14668

A

X M*

0. 0

az0

CDCL

-a

10

Depress. dp

N Injection

0 2 4 6 8 10 12 141Time (p)

1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. lea 10

dp

0. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAPS/Mod3.2

Fig. 4.28: N Mass SG 30 Outlet to half Loop Seal

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I DOKU.98051 3.1842.14668

0.

0.

0.

0.

0.

0.

0.

0.

0.

0.

0.

Depress. dp

(0 z0

CzaCA

m

-U0(0UCl'(0

28 -103

1. h.lea 10 2. c. Wgo 3 3. h. leg 20 4. c.leg 40dp dp

6. c. lea 30N lnlectlon5. h. WO 10




Dleses Blatt unLerlegl den Weltergabebeschrtnkungenwie auf Titelselte bzw. erster Selte angegeben

This document is subject to the restrictionsset forth on th. first or title page 25. 5.98 7:47:59

I DOKU.980513.1 842.14668

Mass (kg)i

IR

4.

(D

"a

0)0)0

Depress. dp

N Injection

6 2 4 1012141116 1'8 22 24 261Time~

1. h.log 10 2. c. leg 30 3. h.log 20 4. c.log 40 S.h.log 10 6. c.log 30

-10 3


Data b4_3 -- RELAP5/Mod3.2Fig. 4.30: Int. N Injection L. 30 Cold Leg(Z), RPV-Side(X), SG-Side(+)

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£DOKU.98051 3.1842.14668

Mass (kg)1 0.50 1

0L

(D0L

V0

z0

z

F(n

U.AD

A JA

0 .4 0 ............... .. . .... .. ... .. . ..... . . . .......................... ... .

0.35* -. [ .- -- - - -- ---- .

0.30 - ............. ...

0.25- __- _

0.20-.. _ -

0.05 .1 -... . ....... .......15-................................!0 .1 0 ...... ............. ..... .... ..

0RLAP Expe.rt. it. no N A =mulatto

n . . . . . . gOL -- W- w___ j .. J- - r

Depress. diN lnfec~tion

'0cca,

P0 2 4 6 8 10 12 14 16 18 2)

1. h. Il 10 2. c. lea 30 3. h. lea 20 4. c. lea 40 5. h. lea 10

22 24 26 I 28 •103

dp6. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.31: Nitrogen Mass Loop 40 Hot Leg + SG Inlet

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zDOKU.980513.1842.14668

4 Mass

X wD

3 0

0

0)N0

Depress. dp

N Injection

6 8 10 12 141limej ()

2.c. leg 30 3. h. leg 20 4. c. leo 401. h. leg 10 5. h. lea10 6. c. lea 30


Data b4_3 - RELAPS/Mod3.2Fig. 4.32: Nitrogen Mass Loop 40 SG U-Tubes

Dieses Blatt untertlegl den Weitergebebeschrlnkungenwie auf Titelselte bzw. erster Selte angegeben


I DOKU.980513.1842.14668

Mass (kg)

0.50-

0.45 . . .-

0.40. ......

0.35.

0.30.

0.25 --

0.20 --

0.15

0 .1 0 . .......................... ................

0.05 .... ......... .

0 2Depress. dp

CD

CL

CD

0

z

C,

z

-u

O)

6 8 10 12 1

2. c.lea 30 3. h.lea 20 4. c.lea 40

•103

dP dp5. h. lea 0 6.C. lea 301. h. leo 10N lnl•L-'tonn



Fig. 4.33: N Mass SG 40 Outlet to half Loop Seal

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This document is subject to the restrictionsset foith on the first or title page 25.5.98 7:18:32

I DOKU.98051 3.1842.14668

Mass0.1

5.(a~30

a

0

z0CO)

"0(0

•103

Depress. dp

1. h. taoo1 2. c.log 30 3. h.leg 20

Time) I~dP

4. c.log 40 5. h.leg 10dp

. .lo~iga 30N Inlction


Data b4_3 - RELAP5!Mod3.2


Dieses Blatt unter4legt den WeltergebebeschrinkungenwMe auf Titelselte bzw. erster Seffe angegeben

This document Is subject to the restrictionsset forth on the first or ttle page 25.5.98 7:47:59

I DOKU.98051 3.1842.14668

Mass

0.ý

X

3)M.

C.

0

z0

Co(D

Depress. dpN Inlection

8 10 1'2 1'4 1 1'8 '2't 2'2 '2'4 '2'6

TMe dp dp

•103


Data b4_3 -- RELAP5/Mod3.2Fig. 4.35: Int. N Injection L. 40 Cold Leg(Z), RPV-Side(X), SG-Side(+)

Dieses Blait unterliegt dan WeitergabebeschrAnkungenwle aut Tltelseile bzw. srater Selle angegeben

This document Is subject to the restrictions

set forth on the first or tiue page 25. 5.98 7:18:57

I DOKU.980513.1842.14668

Mass (kg)1.0

0.8 6 .

0.4

0.2 -....

0.0 -w--1-'- .,0 2

Depress. dp


X

CL

4)

*'9z0

z

-103

0cD

0)0)

Comparison of Experiment und Analysis PKL Il B 4.3

Data b4_3 -- RELAP5/Mod3.2Fig. 4.36: N Mass Closure Head and UPL(X), DC(+), LPL Core and Byp.(Z)

Dieses Blatt unterl.eg2 den Wel4ergabebeschrinkungenwie auf Titelselte bzw. erster Selle angegeben


zDDOKU.98051 3.1842.14668

aMass (kg)

C0

aM

CLI I r. ........ -- . -r- i ,

00

z0

-L

4.'

4.(

St. - t -.l"*"*,,*It"- . . . t..........I . -'t- . -.---,****""**, 't'l'l-11*-**-i-*",-I----t.................. .............. ... I.......v

'/,

-T*-"--.-.-?"t----...-. ..T..................... t ....... .....

ft //I - ~~ ~~~. ..... ... . -......... *,*-*..*..t..-.*..**--*..*...i ... __.........v

'V

0 ............ .... ... . ...........

2.05.......... ... ..

2.0 - ....... . .......... ..................... . .... .-....-........

1.5~~~~ ................ .............. ..............................................................................-.... ...... ...................-....... ..............................-......1.0I ~

-U03(00

0)-'I

V vo

0 2 4

2. c.lea 30 3. h.lea 20 4. c.lea 40

I I.


16 18 2t

dp5. h. lea 10

ý I

22 24 26 2

--dp0. c. leg 30

*103

1. h. lea 10N Infection

Comparison of Experiment und Analysis PKL IIl B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.37: N Mass Primar System RELAP(X), Injected N Mass(+)

Oieses Blatt unterliegt den Weitergabebeschrdlnkungenwie aut Titeiseite bzw. erster Seito angegebon

This document Is subject to the restrictionsset forth on the first or tille page 25.5.98 6:55:4

wz

DOKU.980513.1842.14668

Power (kW)300gI

0L

5.

MU0

zP

z(0

Depress. dp

N Injection


Data b4_3 -- RELAP5/MOd3.2Fig. 4.38: Heat Transfer Experiment SGs 10(X), 20(+), 30(Z), 40(Y)

Dieses Blatt untedlegt den WeltergabebeschrAnkungenwMe aut Titelselte bzw. erster Selte angegeben

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zDOKU.980513.1842.14668

Power

XQ

CL

0

zP

zLI

"O(0

(0

Depress. dp

N Infection

0 2 4 6 8 10 12 14 16 18 2T 22 24 26Time ) - -

P dp dp1. h. lea 10 2. c. e 30 3. h. lea 20 4. c. eg 40 5. h. leg 10 6. c. leg 30

•10 3


Data b4_3 -- RELAP5/Mod3.2Fig. 4.39: Heat Transfer RELAP (smoothed) SG 10(X), 20(+), 30(Z), 40(Y)

Dleses Blatt unterliegt den WellergabebeschrAnkungenwie aui Titelseile bzw. erster Sella angegeben

This document Is subject to the restrictlonsset forth on the first or title page 25. 5.98 6:55: 5

U)03zDOKU.98051 3.1842.14668

Power

CL

:3

i. 1

za

COT0

Depress. dp

MU 1. Ml'nn 1. h. taon1 2. c.log 30 3. h.log 20

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5/MOd3.2Fig. 4.40: Heat Transfer SG 10 Experiment(X), RELAP(+)

Dieses Blatt untertlegt den Weltergebebeschrlnkungenwie auf Titelseite bzw. erster Selte angegeben

This document is subject to the restrictionsset forth on the first or title page 25. 5.98 6:55: 5

I DOKU.98051 3.1842.14668

Power (kW)300 ...

z

0~0.

0a.

0

z

z

4

f00-J

*103

Depress. dpN Inlection 1. h. lea 10 2. c.lea 30 3. h. len20 4. c. lea 40 S.h.lea 10 6. C. leg 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5IMOd3.2Fig. 4.41: Heat Transfer SG 20 Experiment(X), RELAP(+)

Dieses Blatt unterliegi denWeltergabebeschrvnkungenwie aul Titelseite bzw. erster Sells angegeben

This document Is subject to the restrictionsset forth on the first or tidte page 25.5.98 6:55:5

I

DOKU.98051 3.1842.14668

Power (kW)

I

0.5.(0

:rj

s~.a280 . -. I -- " -- i--T -- -..-- I --

2 40 - --------- ---.-------------.--.---- ., ._ ....

2200--- - -- - -- - -......... -.......- .. . ..... .............

200~ ~ ~ ...... .... .... ...........................

28 0 - : .. - . ~ - - . ... . - . .............. .. .. ....

160 n J a a .& a. aa a

z

zaCO

-U

*103U e- Q 0 a IU I1i, Ir+ 10 M0 ~ j

dp

Z4 zo Iz

Depress. dp

N Injection

dp6. C. lea 301. h. lea 10 2. c. leg 30 3. h. lea20 4. c. lea40 5. h.lea 10


Data b4_3 - RELAP5/MOd3.2Fig. 4.42: Heat Transfer SG 30 Experiment(X), RELAP(+)

Dieses Blatt untertlegt den Weltergabebeschrfinkungenwie aut Triteiseite bzw. erster Selto angegeben

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I DOKU.98051 3.1842.14668

Power3O

28

26

94

3:1

(b~

n.

D46 8 1 1*2 14J1'6 1,8 it ý2224 261

1. h.lea 10 2. c.leg 30 3. h.leg 20 4. c.leg40 S.hI. leg 10 6. c.leg 30

*103

Depress. dp

N Inlectlon


Data b4_3 -- RELAP5/MOd3.2

Fig. 4.43: Heat Transfer SG 40 Experiment(X), RELAP(+)

Dieses Blatt unterilegt don WeitergabebeschrAnkungenwie auf Titelselte bzw. erster Seilo angegeben

This document Is subject to the restddctonsset forth on the first or titie page 25.5.98 7:19:1

I DOKU.98051 3.1842.14668

Collapsed Level (m)16 .C,)

z

z

CO)

-u"0(0

10 1'2 141 1'6 '118 -2'f? 2'2 i 4 '26

1mJw dp _ ___dp

1. h. h 10 2. c.leg 30 3. h.leg 20 4. c.Iong40 5. h.IWg10 6. c.leg 30

• 103

Depress. dp

N Inlection


Data b4_3 - RELAP5/Mod3.2Fig. 4.44: CL Loop-Seal 10 SG-Side RELAP(X), Experiment(+)

Dieses Blatt unterilegt den WaitergbebeschrAnkungefwie auf Titelseite bzw. erster Selte angegeben


zDOKU.98051 3.1842.14668

Collaps;ed Level (m)

X---X CNTRLVAR233

5 -

- . ... ...... ..... .

-"..... ...................... % . ......

3 , ....... .............. ....... !.......................... ..... ................................ .. ............I ____

0 2 .4 6.8 0 12. .- _ ...... ( ........ .. .22 I............

10 4 6 8 10 12 14J__16 18 2t1 22 24 26 28. . .. . . . . . . . -

X

a.

0

z9

zCl)

"0

(U

•103

Depress. dp

F Al A I-..~.. 11 h Ian f

"mn~l .~eu4 5.ýio dp6. c. lea 30

2~~J~IJ c- 1 30 3h Ia-0 4 .la0 5 .la1



Fig. 4.45: CL Loop-Seal 20 SG-Side RELAP(X), Experiment(+)

DMoses Blatt unterlegt den We4tergabebeschrinkungenwie auf Thelselle bzw. erster Seito angegeben


IDOKU.98051 3.1842.14668

CL

"O0)(aRD

•103

Depress. p _ Tlme•)N Iniectlon 1.h. lea 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h.lea 10 6.c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 -- RELAP5/Mod3.2Fig. 4.46: CL Loop-Seal 30 SG-Side RELAP(X), Experiment(+)

DKeses Blatt unte51legi den Weftergabebeschrdnkungenwie aut Titelsefte bzw. erster Seate angegben


I DOKU.980513.1 842.14668

A

X

0

CL

;130

itz

C:

.A

-U0

Depress. dp

N Injection

0 2 4 6 8 10 12 141 16 18Time -P-

1. h. leg 10 2. c. leg30 3. h. leg 20 4. c. !eg40 5. h. Ieg 10

• 103

dp6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3Data b4_3 - RELAP5/Mod3.2Fig. 4.47: CL Loop-Seal 40 SG-Side RELAP(X), Experiment(+)

DiOses Blatt unterlegt den Weltergabebeschrlnkungenwie auf Titelselte bzw. erster Seite angegeben


I DOKU.980513.1842.14668

Collapsed Level (m)

7.5 -

7.0.- .

6.0 - ... ....... .......

6.5- t

5.0-

4.5-

4.0-

3.5- - ,-'j .,0 2

Depress. dp

N Inlectlon 1. h. leg 10

Y3

M

z0

zCO)

304

"0

-.

6 8 10 12 141Time (0)

2.c.tlea3 3.h.3 eg2 4.C.Pleg4

dp5. h. lea 10 8. c. lea 30

t I

Comparison of Experiment und Analysis PKL IlI B 4.3Data b4_3 - RELAP5IMod3.2Fig. 4.48: RPV RELAP Core(X), DC(+); Experiment Core(Z), DC(Y)

Dieses Blatt unterilegt den Weltergabebeschr~nkungenwie auf Titelselte bzw. erster Seale angegeben


I

DOKU.98051 3.1842.14668

iquid Generation (kg/s)0.0 20 -- I

0.

09.

-~ r T 1

IhI

0

zP

zCO

(0J,.1IJ I.-I*-ft ... * ..........--.-............ I........... Mrr." I rl - 1 I - It 6, -i - 1 -T - 1 -~T

IJ~! 11110_0 ---- l.. ...-.n n n r, ----------- ....... . _ . ... ... ... .... . . . ..

I"

0.000

-0.005

' III

LIIA ~I

IL 1 I1fILJ .A ~.1i 'i........-x f . ....- - ... ....--..ILAP Ca.cllato.

-'-'-9-

M

"4(0

0I2 I

4 8 10 12 *141 es)

16 18 2(I

dp5. h. leg 10

22 24 26 28 *103


dpS. c. leg 301. h. lea 10 2. c. leg 30 3. h.leg 20 4. c. leg 40



Fig. 4.49: Condensate SG 10, Pipe 320 Ascending(X), Descending(+) U-Tube

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I DOKU.98051 3.1842.14668

Uquid Generation (kg/s)0.05 1

0CL

ID9 1

Depress. dp

lb 26 8 1 12 1411`61I' 2 . 2.2 24 -i.61Time~ (S -lw

1. h.lea 10 2. c.lea 30 3. h.lea 20 4. c. W 40 S. h.lea10 S. c. lea 30

•103

N Inlectlon


Data b4_3 -- RELAP5/Mod3.2Fig. 4.50: Condensate SG 20, Pipe 420 Ascending(X), Descending(+) U-Tube

NRC FORM US U.S NUCLEAR REGULATORY COMMISSiON 1. REPORT NJMAERPam89 (Assigne WyNRO.A"d Val. 4Wp., IRev.NRCM 1102. Wed W=NUMbrM a1y.)

32,=2= BIBLIOGRAPHIC DATA SHEET

2. TIM.E AN .BTF.. E NUREGAA170

RELAP5/MOD3.2 Post Test Calculation of the PKL-ExpertmentPKUII-B4.3 3. DATE REPORT PUWISHD

November 19994. FIN OR GRANT NUMMIR

S. AHTfOR(S) 6. TYPE OF REPORT

L Kaner Technical

7. PERIOD COVERED p• DmcaW

5. PERFOFWING WO TION - NAME AND ADDRESS (rAI p.vtuoiwi o00e crP~gkn U.S. NAwdgf-CoimmwsaGar indman iged*u6 4f re,

poule itim W ,meNg od~wea.

Siemens Energlerzeugung (KWU)Freyerslebenstrasse ID-91058 ErlangenGermany

9. SPONSORMN ORGANIZATION - NAME AND ADDRESS OVDq ow. Sww&s. abwe- 9GW**AcX Flovid NRC Dkhx Oft* Rfgk~ U.S. Acb.wRegu~y CanniunW Rmehi W*,sa)

Division of System Analysis and Regulatory EffectivenessOffice of Nuclear Regulatory ResearchU.S. Nuclear Regulatory CommissionWashington, DC 2D555-0001

10. SUPPtEmENTARY NOTES

11. ABSTRACT 00 wad3 wcr)

The PKL lit test facility (Pdmar-Kes-Lauf) simulates a tyical 1300 MWe Pressurized Water Reactor of SiemensXIWU. In testB4.3, the Influence of non-condensables on heat transfer in the steam generators during reflux condenser conditions wasinvestigated. This report presents the results of a post-test analysis of PKL 1114-4.3 using RELAPSMOD 32- A description of theinput model is given, and the correspondence of measured and calculated results Is discussed.. The results of the calculationshow differences in the distribution of nitrogen In the primary system compared to the experiment When nitrogen was Injected intothe hot leg of the primary system, the heat transfer In the affected steam generator decreased. In contrast to the experimentRELAP calculated that the volumes in the adjacent steam generator did not get the full amount of nitrogen and that nitrogen wastransported from the steam generators to other locations during the course of the transient. Thus, the heat transfer in these steamgenerators later increased in contradiction to the measured values. In the steam generator tubes, RELAP Calculated that thenitrogen accumulated in the descending part as predicted in the experiment For the ascending U-tubes RELAP predicted that thenitrogen was transported to the loop seal, which was not seen in the experiment Fluctuations occurred during the course of theRELAP5/MOD 3.2 analysis of the PKUII B4.3 experiment This phenomenon may be the main reason, that RELAP calculates thetransport of nitrogen from the steam generators into the system and predicts finally a homogeneous distribuAon of nitrogen in theprimary system. The anaVlys performs an in kind contribution to the CAMP contract

12. KEYWORDS/IDSCRIPTORS "t w - .r #•twNesise•-• •e km• •mp•J 1 AVALABLrJY SATEMENT

PKL III Test Facility unlimitedPWR 14. SE fCL9CLSSFICAN

non-condensables M* fe,)

steam-generator unclassifiedRELAPS/MOD32 FM. PA

unclassified15. NLUABER OF PAGES

16. PRICE

NRC FORM 335 (2)

Federal Recycling Program

nureg/ia-0170, 'international agreement report - relap5 ...in test b4.2 the primary inventory...

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