ML17037C254

Letter Regarding the Analysis of the Capability of Unit 1 to Accommodate Anticipated Transients Without Scram and Advising That Reanalyses Have Been Initiated and Will Be Submitted by October 1, 1974

ML17037C254
Person / Time
Site:	Nine Mile Point
Issue date:	11/30/1973
From:	Schneider R Niagara Mohawk Power Corp
To:	Anthony Giambusso US Atomic Energy Commission (AEC)
References
Download: ML17037C254 (6)

Text

j ~l AEC TRIBUTION FOR PART 50 DOCKET RIAL 8642

, (TEMPORARY FORM) CONTROL NO:

'ILE:

FROM: DATE OF DOC DATE REC'D MEMO RPT OTHER Niagara Mohawk Power Corporation Syracuse, N>Y. 13202 Mr. R.R. Schneider 11-30-73 12&-73 TO ~ ORIG CC OTHER SENT AEC PDR XXX SENT LOCAL PDR A. Giambusso 1 signed CLASS UNCLASS PROP INFO INPUT NO C S PZC'D DOCKET NO:

XXX 50-220 DESCRIPTION: ENCLOSURES:

Ltr re our 10-19-73 ltr....concerning reanalyses of the anticipated transients with scram, adv 'ACKNOWLEDGED that this study has been initiated and will be submitted by 10-1-74F, as requested in our ltr.

.DO NOT REMOVE PLANT NAME: Nine Mile Point FOR ACTION/INFORfATION DICKER(E)

BUTLER(L) SCHWENCER(L) V ZIEMANN(L) REGAN(E)

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W/ Copies W/ Copies W/ Copies W/ Copies GOLLER(L) VASSALLO(L) KNIGHTON(E) "

W/ Copies W/ Copies W/ Copies W/ Copies KNIEL(L) SCHEMEL(L) YOUNGBLOOD(E).

-W/ Copies W/ Copies W/ Copies W/ Copies INTERNAL DISTRIBUTION REG TECH REVIEW DEN TON A/T IND AEC PDR ~HENDRIE GRIMES LIC ASST 'RAIIMAN OGC, ROOM P-506A SCHROEDER GAMMILL HIGGS (L) SALTZMAN MUNTZING/STAFF MACCARY KASTNER GEARIN (L) B. HURT CASE KNIGHT BALLARD GOULBOURNE (L) PLANS u'GIAMBUSSO PAWLICKI SPANGLER LEE (L)

~MCDONALD BOYD SHAO MAIGRET (L) DUSE MOORE (L) (BWR) STELLO ENVLRO SERVICE (L)

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November 30 1973 IL, Ny Mr. A. Giambusso Deputy Director for Reactor Projects 10 Directorate of Licensing lg '..

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U. S. Atomic Energy Commission Washington, D. C. 20545 C III 5 tg73

Dear Mr. Giambusso:

IrppL1Ippy SNL pfp7(pl kocEQ gag Re: Nine Mile Point Unit 1 Docket No. 50-220 Our application for conversion of Provisional Operating License No. DPR-17 to a full-term operating license included an analysis of the capability of Nine Mile Point Unit 1 to accommodate anticipated transients without scram.

Since the time of that submittal, certain changes have taken place which affect the analysis of these transients and other anticipated transients.

The attachment to your letter of October 19, 1973 included assumptions and criteria to be used in the analysis of transients without scram. The analysis which was included in our previous submittal showed that for the worst case during anticipated transients without scram, containment pressure could reach 45 psig.

This exceeds the design pressure of the suppression chamber. The attachment to your letter of October 19, 1973 specified containment design pressure as the acceptable limit. L The previous analyses'of other transients which include scram were performed assuming no tripping of the recirculation pumps. Preliminary investi-gations indicate that incorporation of a tripping of the pumps on high reactor pressure aggravates these transients.

...See Page 2 8642

TQMr. A. Giambusso Because of the changes to the analyses as described above, Niagara Mohawk considers that the addition of the recirculation pump trip is not justified until reanalyses of anticipated transients without scram and other transients are completed. Therefore, the tn.p of tFie recirculation pumps on high reactor pressure is being deleted from the protection system circuitry. The reanalyses of the anticipated transients without scram have been initiated and will be submitted by October 1, 1974 as requested in the attachment to your letter.

Very truly yours, udolph . Schn ader Vice President .- Electric Operations CVM/s z

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