ML20009D900

Responds to IE Bulletin 81-03 Re Blockage of Cooling Water to Safety Sys Components by Clams & Mussels.Provisions Will Be Made to Minimize Introduction of Clams Into Raw Water Sys.Fifteen Manhours Expended in Preparation of Bulletin

ML20009D900
Person / Time
Site:	Perkins, Cherokee
Issue date:	07/08/1981
From:	Dail L DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-81-03, IEB-81-3, NUDOCS 8107240481
Download: ML20009D900 (2)

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, OFFICIAL COPY DUKE PowEn COMPANY ELECTIllC CENTEH.130X 33189. CHAltLorrE. N. C. 28242

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IE Bulletin 81-03 -

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Dear Mr O'Reilly:

Attached is Duke Power Company's response to your April 10, 1981, letter transmitting fluclear Regulatory Commission IE Bulletin 81-03. Approximately 15 manhours were expended in the research and preparation of our response to this bulletin.

I declare under penalty of perjury, that the statements setforth herein are true and correct to the best of my knowledge.

Very truly yours,

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I f L C Dail, Vici Presi nt Design Engineering Department DLS:dm Attachment 46lf 5 cc: Director, Division of Reactor Operations Inspection l Office of Inspection and Enforcement U S fluclear Regulatory Commission Washington, DC 20555 8107240481 810700 PDR ADOCK 05000488 G PDR

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DUKE POWER COMPANY CHER0KEE AND PERKINS NUCLEAR STATIONS RESPONSE T0 IE BULLETIN 81-03 Duke Power Company has more than 10 years' experience dealing with fouling caused by Asiatic clams at its generating facilities. The Asiatic clam has been present in the Duke service area since the mid-1960s. It became a nuisance at one of the fossil fueled plants in 1970 and a program of remedial actions was initiated to minimize the effects of the clams. As the clams extended their range throughout the Duke system, an ad hoc committee was officially formed in 1978 to deal with clam-related problems at all Duke generating facilities. This committee is reviewing'each plant to determine, in general, how best to protect raw water systems from fouling by clams.

If the clams become a nuisance at a plant, then specific changes involving piping modification, maintenance procedures, and/or biocide application are developed on a case-by-case basis. Duke's Cherokee and Perkins nuclear stations will be reviewed by the committee, and the status of cles infestation will oe carefully monitored.

At the present, there are no completed systems or filled ponds or basins at these plants; additionally, all of the cooling systens using raw water will be closed loop cooling tower type systems. Provisions will be made to minimize the introduction of clams into the raw water systems and to allow for removal of clams should infestation occu?. Performance monitoring and visual inspection I,tograms will be developed, and appropriate corrective action will be taken should these programs indicate any potential problems.

DLS:dm 7/8/81

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