c z.37~ · s _ open items effluent treatments branch etsb-1: esf atmosphere cleanup system srp...
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NORTIMASTIfTILITIES """ " "" ""' "" "'. een n. connect, cut
"**''"*#""'"""""j P.O. 8OX 270C Z.37"~ HARTFORD. CONNECTICUT 06141-0270
(203) 666-6911own va cow-g g g
July 13,19":
Docket No. 50-423Bil266
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Director of Nuclear Reactor Regulation Y
Mr. B. 3. Youngblood, Chief 7
Licensing Branch No.1Division of LicensingU. S. Nuclear Regulatory CommissionWashington, D. C. 20555 .
Reference: (1) W. G. Counsil letter to B. 3. Youngblood, Submittal ofResponses to Draf t SER Open items, dated April 12,1984.
(2) W. G. Counsil to B. 3. Youngblood, Submittal of RevisedResponses to Effluent Treatment System Open items, datedJune 19,1984.
(3) W. G. Counsil to B. 3. Youngblood, Revised Response toEffluent Treatment System Open Item, dated June 29,1984.
(4) B. 3. Youngblood letter to W. G. Counsil, Draf t SER forMillstone Nuclear Power Station, Unit No. 3, datedDecember 20, 1983.
Dear Mr. Youngblood:
Millstone Nuclear Power Station, Unit No. 3Submittal of
Revised Response to Effluent Treatment System Open item
References (1), (2) and (3) responded to Effluent Treatment System open itemsidentified in R;ference (4). As a result of further discussions with the NRC, we
8407300187 840713PDR ADOCK 05000423 ngE PDR V
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are providing a revision to ETSB-1 on instrumentation for ESF AtmosphericCleanup Systems.
Very truly yours,
NORTHEAST NUCLEAR ENERGY COMPANYet. al.
BY NORTHEAST NUCLEAR ENERGY COMPANYTheir Agent
W . b.bW. G. CounsilSenior Vice President
LI
BY: C. F. SearsVice PresidentNuclear and Environmental Engineering
STATE OF CONNECTICUT )) ss. Berlin
COUNTY OF HARTFORD )
Then personally appeared before me C. F. Sears, who being duly sworn, did statethat he is Vice President of Northeast Nuclear Energy Company, an Applicantherein, that he is authorized to execute and file :he foregoing information in thename and on behalf of the Applicants herein and that the statements containedin said information are true and correct to the best of his knowledge and belief.
4)WidAnb dth; Notary Pup
My Commission Expires March 31,1988
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Open Items
Effluent Treatments Branch
ETSB-1: ESF Atmosphere Cleanup System
2. Pressure drop across filter sections is verified to be not more than theTechnical Specification pressure drop with a specified flow rate throughthe filter.
o At least once per 18 months.
3. In-place testing will estabilsh the design flow with system resistancecorresponding to design dirty filter condition. The dp alarm setpoints foreach ESF filter train system can be set to correspond to the (-10%) flow
.condition through the respective filter train system to ensure that during
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all operating conditions flow is maintained within 110% of design flow.
The ESF systems fans are fixed speed fans, and the system flow rates vs.pressure drops will be verifiari during plant operation ut!!hing the attachedfan curves.
4. The surveillance tests and controls described ensure that the pressure dropacross filter sections and flow rates through the ESF filters are maintainedwithin the Tech. Spec. limits, which will ensure that the ESF filters willperform their safety function.
With the above system design and surveillance requirements, there are nocredible events which would cause the flow to vary such that the filters wouldnot properly function. All of the air operated dampers are designed to fall in thesafe position. Manually operated dampers are not postulated to change position.
. This will insure minimum flow rates through the filters.
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Open Items_
Effluent Treatments Branch
ETSB-1: ESF Atmosphere Cleanup System
SRP Section 6.5.1, Revisions 1 and 2, and RG 1.52, Revisions 0,1, and 2, call foreach ESP atmosphere cleanup system to be instrumented to signal, alarm, andrecord pressure drop and flow rate at the control room. Mllistone Unit 3 ESF,
atmosphere cleanup systems are provided with only local pressure differential- indicators across each filter with a common alarm in the control room for highpressure differential across the filter bank. The pressure differentials acrosseach filter are transmitted to the plant computer in the main control room. Theapplicant stated in the FSAR that periodic surveillance tests will be performed toensure design flow rates through each ESF atmosphere cleanup system. The;
staff will complete its evaluation after further discussion with the appilcantregarding Indicators and recorders in the main control room. This issue will beaddressed in the final SER. This is an open_ltem.
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Response: -I
For the ESF atmosphere cleanup system, high differential pressure across a filtersection is alarmed in the control room and monitored by $e plant computer to
;- -identify the section having the high differential pressure. In the event of a high .differential pressure alarm, operator action can be taken to start the staneyfilter train. In addition, the standby system will start automatically if air flow
|- through the filter is low.
As described in FSAR section 1.9, continuous indication or recording of air flowsthrough individual ESF-filtration units is not considered necessary to ensure,
reliable system operation. Periodic surveillance tests ensure that systembalancing is adequate to maintain operating flow rates through filtration units
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within design limitations. Failure of system fans to function is sensed by flowsensors which automatically start standby units. Sensors to detect high air flow
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conditions are not necessary since the system is balanced such that the flow islimited to ensure proper performance of the filtration units.
Periodic surveillance tests, as described herein, ensure that system flow rates. will be within unit design parameters.
Surveillance tests that will be comiucted on ESF atmosphere cleanup systems'
include the folio, wing:-
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1. Filter flow rate verified to be equal or greater than the flow rate asspecitled in the Technical Specification
| .o At least once per 18 months
o After any structural maintenance on the HEPA filter or charcoalabsorber housing
Following painting, fire, or chemical release in any ventilation zoneo! communicating with the system while in operation.
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