ML20009D827

Responds to IE Bulletin 81-03.Corbicula Sp Not Found in Facility Environ.Effectiveness of Planned Methods for Detection & Prevention of Fouling Found Inadequate.No Cooling Water Sys Currently Flooded.Ten Manhours Spent

ML20009D827
Person / Time
Site:	Seabrook
Issue date:	07/08/1981
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-81-03, IEB-81-3, SBN-168, NUDOCS 8107240387
Download: ML20009D827 (2)

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SEABROOK STATION Engineering Office:

1671 Worcester Road July 8, 1981 Framingham, MA 01701 e

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Attention: Mr. Boyce H. Grier, Director

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References:

(a) Cons truction Permits CPPR-135 and CPPR-13'67Do~ck'et Nos .

50-443 and 50-444 (b) NRC IE Bulletin 81-03, dated April 10, 1981

Subject:

Response to IE Bulletin 81-03; " Flow Blockage of Cooling Water to Safety System Components by Corbicula sp. ( Asiatic Clam) and Mytilus sp. (Mussel)"

Dear Sir:

The following information has been prepared in response to your specific request contained in Reference (b) for holders of construction permits.

1. Extensive sampling of the marine environment that will be used for Seabrook Station source and receiving water shows that Mytilus sp. is found there; Corbicula sp., a fresh water bivalve is not. The planned method of Mytilus control will be a combination of thermal treatment for the main circulating water and low level chlorination for service water systems. Implementation date for detection and prevention of system flow blockage will be concurrent with system flooding. Because the intake structures are near mid-level in about 50 feet of water, the effect of water level (tidal amplitude of about 8 feet) should not influence the potential for intrusion of Mytilus into the system. The effectiveness of the planned methods for detection and prevention of Mytilus fouling is adequate judged from empirical informa tion.

2. Presently, there are no cooling water systems flooded.

3. The Licensee has conducted a comprehensive environmental monitoring program beginning in 1969 and continuing through to the present. The collection of subtidal and intertidal hard substratee benthic organisms assures us of the presence of Mytilus. Monthly samples taken in May of 1981 showed Mytilus to be present.

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5 0107240387 010708 PDR ADOCK 05000443 l9 C PDR

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U.S'. Nuclect Regulatory Commission July 8,1981  !

..' + * .. Attan ticn: Mr. Boyce'H. Grier, Director Page 2

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, Items 3 (b), (c), (d), and (e) are not pertinent to the Seabrook case because no. cooling water systems have been flooded.

The aanpower expended in the conduct of the review and preparation of this report was ten hours. PSNH has been aware of the presence of Mytilus in the source and receiving water for Seabrook Station since the inception of its environmental monitoring program in 1969 and therefore did not require ,

additional manpower to take corrective action vis-a-vis IE Bulletin 81-03. l r

'If you desire additional information regarding this response, please con tact this office.

L Very truly yours, i

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John DeVincentis  :

I Project Kanager cc: Director, Office of Inspection and Enforcement lU.S. Nuclear Regulatory Commission Washington, D. C. 20555

- COMMONWEALTH OF MASS ACHUSETTS) f) )ss MIDDLESEX COUNTY )

Then personally appeared before me , J. DeVincentis, who, being duly sworn, did state that he is a Project Manager of Yankee Atomic Electric Company, that he is duly authorized to execute and file the foregoing request in the n me and on the behalf of Yankee Atomic Electric Company, and that the statements

~ therein are true -to the best of his knowledge and belief.

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3 Robert H. Groce Notary Public My Commission Expires September 14, 1984 2 .f

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