ML17037C458

Letter Responding to the February 15, 1975 Correspondence Concerning the Steam Quenching Vibration Phenomenon and Advising an Investigation Is in Progress and Will Be Submitted by May 30, 1975

ML17037C458
Person / Time
Site:	Nine Mile Point
Issue date:	03/27/1975
From:	Rhode G Niagara Mohawk Power Corp
To:	Lear G Office of Nuclear Reactor Regulation
References
Download: ML17037C458 (6)

Text

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NRC D 'TRIBUTION FOR PART 50 DOCKE IATERIAL (TEMPORARY FO Riot)

CONTROL NO:

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Niagara Mohawk Power Cor DATE OF DOC

Syracuse, Ntt

3-27-75 DATE REC'0 3-,31-75 LTR TWX RPT OTHE R TO:

CLASS Mr Lear UNCLASS XXXXX PROPINFQ ORIG one signed INPUT CC OTHER NO CYS REC'D 1

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SENT AEC PDR SENT LOCAL PDR DOCKET NO:

50-220 DESCR IPTION:

Ltr notarized 3-27-75....advising that tge3r are reviewing the possible neci%sity of a.

possible Tech Specs change with regard to ste quenching vibration phenomenon...re our 2-15-7 s

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NIAGARAMOHAWKPOWER CORPORATION

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MOHAWK 300 ERIE BOULEVARD, WEST (LI ~ SYRACUSE, N. Y. 13202 pOCEOW'yIIIIC MwVI>>>>"

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~celOg H\\dl Section Mr. George Lear, Chief Operating Reactors Branch 83 Division of Reactor Licensing U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Re:

Nine Mile Point Unit 1 Docket No. 50-220

Dear Mr. Lear:

'his letter is in response to your February 15, 1975 correspondence concerning the steam quenching vibration phenomenon.

Technical Specifications 3.3.2 and 4.3.2, as presently incorporated in the operating license for Nine Mile Point Unit 1, provide adequate limits for suppression chamber water temperature.

These specifications include the provision that reactor temperature be brought below 215 F within ten hours if suppression chamber water temperature limits are exceeded.

Surveillance requirements for water temperature and suppression chamber integrity are also provided.

In additi'on to these specifications, operating procedures require a visual inspection of the suppression chamber in the unlikely event that a relief valve should fail to reseat normally.

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Mr. George Leatr U. S. Nuclear Regulatory Commission Page Two March 27, 1975 We are presently investigating whether or not new requirements, in addition to those contained in our February 15, 1974 submittal, may be desirable to ensure suppression chamber integrity.

The results of this investigation will be submitted by May 30, 1975.

Very truly yours, Gera d K. Rhode Vice President-Engineering 1

l GH/sz CERTIFIED HAIL RETURN RECEIPT REQUESTED Subscribed and sworn to before me this 27 day of March, 1975.

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Notary Public HAZEL J. CARRICK Notary Public in tho Stato oi Now cwork Qualified in Onon. Cn. Ro...

~~rt My Commisaion bpircs March JO,I~J'74

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