ML20004D620
| ML20004D620 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 05/21/1981 |
| From: | Randazza J Maine Yankee |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| FMY-81-83, IEB-81-03, IEB-81-3, NUDOCS 8106090589 | |
| Download: ML20004D620 (2) | |
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RIAIRE Md HARHEE Aleml0 POMR COHiPARU
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United States tb: lear Regulatory Commissicn D
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Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 D'
Attention:
Mr. Boyce H. Grier, Director Re ferences:
(a) Licnese to. OFR-36 (Docket tc. 50-309)
(b) UStfiC Letter to MYAPC Cated April 10, 1981 IE Sulletin tb. 81-03
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Subject Response to IE Bulletin tc. 81-03
Dear Sir:
Your letter, Reference (b), revealed a potential for Flow Blockage of Cooling Water to Safety System componenets by CORBICULA SP ( Asiatic Clam) and MYTILUS (Mussel). Maine Yankee has completed the necessary review and offers the following information, numcered to correspond with the Eulletin.
The following information is submitted in response to your request for estimates of manpower expended in the research and subsequent performance of actions associated with this letter / bulletin / document:
Mancower Recuirements Hours Bulletin Response 10 Manhours Corrective tctions No Additional It should be clearly understood that this information is not adecuate to enable a value/ impact assessment.
In addition, an adequate determination of i
the safety improvement as a result of this document needs to be included.
1.
Mytilius is present in the vicinity of Maine Yankee Ccoicula is not.
2.
Mussel growth in the circulating water and service water sy tems was anticipated in the original plant design and does occur at Maine Yankee.
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MAIN 2 YANKEE ATOMIC POWUf) CCMPANY I.hited States Nuclear Regulatory Commission May 21, 1981 Attention: Mr. Boyce H. Grier, Director 3.
Adequacy of cooling flow is primarily determined by the component r.coling water outlet temperature from the heat exchangers that are cooled by service water.
4.
Maine Yankee periodically operates the Mussel Control System to prevent any detectable degradation of cooling water flow. The procedure for mussel control involves the use of warm water to flush the affected piping and heat exchangers.
The procedure is used periodically when the mussels are in post larval " spat" stage of develcpment.
5.
See the responses to Items 1-A above.
We trust that this information is satisfactory.
If you have any further questions, please feel free to contact us.
Very truly yours, MAINE YANKEE ATOMIC PCwER CCMPANY v
'J. B. Randazza Vice President, Operations J3R/pib STATE CF MAINE
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)ss COUNTY OF KENNEBEC)
Then personnally appeared before me, J. B. Randazza, who being duly sworn, did state that he is Vice President of Maine Yankee Atomic Power Company, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Maine Yankee Atomic Power Company, and that the statements therein are true to the best of his knowledge and belief.
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Notary Puolic MY Commission Expires 7)Nc, /
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