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1981 CALVERT CLIFFS II PEF;'ELING OUTAGE

END OF CYCLE 3 EDDY CURRENT INSPECTION

RESULTS ON CONTROL ELEMENT ASSEMBLIES (CEA's)

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CEN-154 (B)-NP

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MARCH 5, 1981

01170 3 8

LEGAL NOTICE.

THIS REPORT .VAS PREPARED AS AN ACCOUNT OF WORK SPONSOREDBY COMBUSTION ENGINEERING, INC. NEITHER COMBUSTION ENGINEERINGNOR ANY PERSON ACTING ON ITS BEHALF: ,

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A. MAKES ANY WARRANTY OR R EPR ES ENT ATION, EXPRESS ORIMPLIED INCLUDING THE WARRANTIES OF F#TNESS FOR A P* RTICULAR

PURPOSE OR ME R CH AN T A BI LIT Y. WITH n';S PE CT TO 1HE ACCURACY,

COMPLETENESS, CR USEFULNESS OF THE INFORMAT'ON CC''T AINED IN THISREPORT, OR TH AT T HE USE O F AN Y INF ORMATIOrs, APP AR ATUS, *.'.E T HOD, '.

OR PROCESS DISCLOSED IN THIS REPORT MAY Nf]T INF RINGE PRIVATELYOWNED RIGHTS;CR

E. ASSUMES ANY LI ABILITIE3 'AITH RESPECT TO THL USE OF. On FORDAMAGES RESULTING FRCM THE USE OF, ANY INFORf.1ATION, APPAR ATUS.METHOD OR FROCESS DISCLOSED IN This REFORT.

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A. CEA EDDY CURRE."T TEST RESULTS,

were eddy current tested during the Calvert'

C iffs II EGC-3 refueling outage in January, 1981. The CEA's resided in

tle core positicns shown in Figure 1 and had been eddy current testedf llowing Cycle 2 (Ref.1). The purpose of the eddy current inspecticns was

tolocateandquantifypotentialwearatthe( .

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The testing was performed in accordance with approved C-E procedures for

the detection of CEA wear. The, of each CEA finger was in-

spected with an encircling eddy current coi!.

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At E0C-3, sli;,nt indications of wear were observedThe eddy current data collected en could not be interpreted

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with any certainty due to electronic and mechanical equipment problemsencountered during the inspection activity at the site. Consequen.ly no

data are presented for tnis CEA.

Thesignalf I from these CEA's are summarized inJ

Table 1. In order to cetermine the magnitude of wear associated witn a given

signal,the signal in each case must be compared to signals obtained, ,

from testing a standard with wear simulations of known size and gecmetry. A

description of the wear standard, used in t.his progran, and the correspondingsignall .easured at ECC-3 is presented in Table 2. !!ote that the signal

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depends' upon thE.

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Thestandardusedinthisprogramconsistsoff~

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and wa: the same standard used in. .

the EOC-2 measurements at Calvert Cliffs II.

I 'of the average indicated wear following Cjcle 3 rangesThe [ ] . -r

from CEAl also exhibitsL -> .

.- tne maximum wear signal of which correspcnds to a wear value of

approximately }

Measurements on the scme fingers at EOC-2 showed

as measured after Cycle 3 considering the estimated overall measurementuncertainty of the CEA eddy current test system. After Cycle 3

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the maximum signal was found in the Af t .- Cvele 2 the,

approximatewearestimatewasi while at EOC-3 the approximate-'

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wear e.wimate was for this indication. It should be added i,

that comparison of data between different inspection programs.must be basedupon Equipment can vary

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from one test series to another resulting' in different ~'

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The degree of wear measured in the CEA's at EOC-3 is acceptable for.

continued CEA operation since the measured wear is less than. .

(Ref. 2).

B. VISUAL INSPECTION' ~

The lower of was visually inspected by TY. No anomalies'

were observed on any finger and no perceptible diameter variations were.

observed at any of the wear locations.

REFERENCES - ..

1. "Results of the CEA Guide Tube Inspection Program, Calvert Cliffs Unit #2Docket No. 50-318", CEN-118 (B)-P, November 8, 1979

2. " Response to Request for Additional Information, CEA Guide Tube

Inspection Program, Calvert Cliffs Unit No. 2, Docket No. 50-313",CEN-116 (B)-P, dated October 8, 1979.

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TABLE 1

CALVERT CLIFFS II END-OF-CYCLE 3 CEA 'n' EAR TEST RESULTS

APPROXIF. ATE LOCATION,

CEA NO. FINGER RESULTS_

(It'CHES FROM CEA BOTTOM)

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TABLE 2

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~ CORRELATION: EDDY CURREriT TEST STANDARD SICNfsL lVS. WEAR

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WEAR STANDARD (INCONEL 625 TUBING).

WEAR SIMULATION AVERAGE ...

SIGNAL.

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*CORRELATIONS APPLY TO CALVERT CLIFFS II EOC-3 INSPECTIC!4 DNLY

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CORE LOCATIONS OF CEA's DURITIG ChCLES 1 TilRU 3 FOR CEA'S TilAT WERE EDDY CURREilT TESTED AFT.R CYCL.ES 2 AfiL' 3FIGURL 1.

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