ML20050D560

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Updates Response to IE Bulletin 81-03, Flow Blockage of Cooling Water to Safety Sys Components by Corbicula Sp (Asiatic Clam) & Mytilus Sp (Mussel). RHR Exchanges Relatively Free of Biofouling
ML20050D560
Person / Time
Site: Shoreham File:Long Island Lighting Company icon.png
Issue date: 03/30/1982
From: Pollock M
LONG ISLAND LIGHTING CO.
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-SSINS-6820 IEB-81-03, IEB-81-3, SNRC-682, NUDOCS 8204120316
Download: ML20050D560 (2)


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gg; LONG ISLAND LIGHTING COM PANY Sn , _ .- u 175 EAST OLD COUNTRY ROAD H IC K SVI L LE. NEW YORK 11801 un a.o n nouoc" March 30, 1982 VIC E Ppt SIDE N T - NVC1 E AH SNRC-682 4  %

D Mr. Ronald C. Haynes Regional Administrator, Region 1 U.S. Nuclear Regulatory Commission 2 gggEIV6Q 7 631 Park Avenue _: 2'-

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*Qpl$,)t:5 I&E Bulletin 81-03 tf G Long Island Lighting Company 0 6 SHOREHAM NUCLEAR POWER STATION - UNIT 1 Docket No. 50-322

Dear Mr. Haynes:

In our response to I&E Bulletin 81-03, via letter SNRC-590, dated July 7, 1981, it was stated that bio-fouling had taken place in the non-safety related Turbine Building Service Water System. The following information is provided to update that response based upon recent Startup test experience.

Our initial response stated that the blue mussel Mytilus edulis was found to have fouled the 24 inch supply pipe to the Turbine Building Closed Loop Cooling Water System Heat Exchanger (TBCLCW) with shells and debris found to De in the TBCLCW inlet boxes.

This particular system had been operated intermittently for some time in excess of two years. Initially a submersible pump located in the intake canal supplied unfiltered seawater at a lower than normal flow and without adequate chlorination.

During the latter part of that two year period, a second tempo-rary pump was utilized providing higher flow but again without filtration. During this period, final dredging of the intake canal was also performed which is considered to contribute to the bio-fouling process which occurred. It should be noted that no safety related heat exchangers were supplied service water through this same time span.

At present, various service water supplied heat exchangers having safety related functions are in the Startup test phase. The water as supplied is f rom the safety related Reactor Building Service Water Systcm using the plant pumps and strainers. After approximately eight months of intermittent operation, the RHR 8204120316 82O330 g PDR ADOCK 03000322 G PDR

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March 30, 1982 SNRC-682 Page Two l exchangers were visually inspected for bio-fouling and none  !

was noted other than a handful of shells. The Reactor Building Closed Loop Heat Exchangers have also been similarly inspected and found to be free of bio-fouling.

To assure adequate flow to all heat exchangers in safety-related systems using service water, flow elements have been provided on inlet or discharge of each exchanger. Because of the safety and performance implications associated with blockage of these heat exchangers, the station operational i procedures will contain requirements for periodic monitoring and inspection. As a minimum, flow for all safety-related service water supplied heat exchangers, as tabulated below, will initially be checked quarterly with visual inspection i of exchanger inlet channels to be performed at eighteen month intervals as appropriate. The interval for this periodic program will be adjusted as a result of monitoring and evalu-ation of test data. This program will help ensure that the safety-related heat exchangers are available when required.

Heat Exchanger Designation i

Reactor Building Standby Ventilation IM50*WC-003A,B System (RBSVS)

Control Room Air Conditioning (CRAC) IM50*WC-004A,B Residual Heat Removal (RHR) IEll*E-034A,B L 1

Reactor Building Closed Loop Cooling IP42*E-Olla,B Water (RBCLCW)

Diesel Cooler IR43*E-013A,B,C We trust the above information has been responsive to your request. If you have any additional information requirements, please do not hesitate to contact us.

Very truly yours, yn. J24L4 M. S. Pollock Vice President - Nuclear HE/pg cc: J. Higgins - NRC Trailer 1

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