ML17037B539

Letter Regarding an Investigation Revealing No Instrument or Electrical Lines in the Torus Which Could Be Impacted by the Solid Catwalk, Which Will Be Removed and Replaced with a Grating Catwalk During the Spring 1977 Refueling

ML17037B539
Person / Time
Site:	Nine Mile Point
Issue date:	08/27/1976
From:	Schneider R Niagara Mohawk Power Corp
To:	Lear G Office of Nuclear Reactor Regulation
References
Download: ML17037B539 (4)

Text

V.S. NUCLGAA IlFOLILnTOIIYO'SSION a0 DOCKET MATERlAL FROM: NIAGARA MOHAWK POWER CORP SYRACUSE'Y R R SCHNEIDER TO: MR GEORGE LEAR NIIC FOAM 106 I2 TOI

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DESCAIPTION LTR REF OUR 1-7-76 LTR......'ADVISING THE SOLID CATWALKWILL BE REMOVED AND REPLACED

'URING THE SCHEDULED SPRING 19"(7 REFUELING OUTAGE@

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'ugust 27, 1976 Director of Nuclear Reactor Regulation Attn:

Mr. George Lear, Chief Operating Reactors Branch ¹3 U. S. Nuclear Regulatory Commission Washington,. D. C.

20555 Re:

Nine Mile Point'nit 1 Docket No. 50-220 DPR-63

Dear Mr. Lear:

Your letter of January 7, 1976 requested information regarding potential damage to critical torus internal structures and components from missiles generated as a result of bulk pool swell loads impacting the solid catwalk, at Nine Mile Point Unit In a June 18, 1976 letter from Mr. E. A. Hughes to Mr. V.

Stello of the Commission, General Electric provided answers regarding all possible impact targets except for instrument and electri cal lines.

Subsepzent investigation revealed that there are no instrument or electrical lines in the torus which could be im-,

pacted by the solid catwalk.

Nevertheless, as indicated in our July 23, 1976 letter to the Commission, the solid catwalk will be removed and replaced with a grating catwalk during the

'cheduled

Spring, 1977 refueling outage.

Very truly yours, NIAGARA MOHWK POH'ER CORPORATION c

ider Vice President Electric Production

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