ML18143A029

R. E. Ginna - Response to NRC Request Regarding Submittals of 01/16/1978 & 02/15/1978 on the ECCS Analyses for R. E. Ginna Nuclear Power Plant

ML18143A029
Person / Time
Site:	Ginna
Issue date:	04/25/1978
From:	White L Rochester Gas & Electric Corp
To:	Ziemann D Office of Nuclear Reactor Regulation
References
Download: ML18143A029 (4)

Text

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DISTRIBUTION FOR INCONING MATERIAL 50-244 REC: ZIENANN D L ORG: WHITE L D DOCDATE: 04/25/78 NRC ROCHESTER GAS 8( ELEC DATE RCVD: 04/27/7 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 0 RESPONSE TO NRC REQUESTS OF 01/16/78 0 02/15/78... FURNISHING INFO CONCERNING THE ECCS ANALYSES FOR SUBJECT FACILITY.

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',, '51A1C IIIIIII////jt I Se@ZZ ROCHESTER GAS AND ELECTRIC CORPORATION o 89 EAST AVENUE, ROCHESTER, N.Y. I4649 LEON D. WHITE, JR. TELEPHONE VICE PRESIOENT AREA COOE TIa 546.2700 April 25, 1978 CD f5' 5

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C7 Director of Nuclear Reactor Regulation R I

-Attention: Mr. Dennis L. Ziemann, Chief Vl CA C7 Operating Reactors Branch No. 2 U.S. Nuclear Regulatory Commission Washington, DC

Dear Mr. Ziemann:

This letter is in response to a request from a member of your staff regarding our submittals of January 16, 1978 and February 15, 1978 on the ECCS analyses for R. E. Ginna Nuclear Power Plant. The calculations described in those submittals, performed by Westinghouse Electric Corporation, demonstrated that.

the effect on peak clad temperature of assuming low head ECC water injection into the upper plenum instead of into the cold legs is insignificant (an increase of 15'F in peak clad tem-perature). The difference in injection point is plant related and is independent of fuel types. In addition, although the Ginna reactor -will be operating during Cycle 8 with fuel fabri-cated by Exxon Nuclear Company as well as by Westinghouse Electric Corporation, the Exxon fuel is very similar to the Westinghouse fuel in design and operating characteristics. (See Exxon Nuclear Company reports XN-NF-77-52(P) and XN-NF-77-53 submitted with Application for Amendment, to Operating License on January 6, 1978).

Thus, the finding of insignificance reported in our January 16 and February 15 submittals is applicable to the Exxon fuel as well as to the Westinghouse fuel.

Nevertheless, in order to provide additional confirmation that the impact of injection point is small, we will obtain from Exxon Nuclear Company an analysis of the effect of upper plenum injection on the peak clad temperature obtained from their cal-culations. This additional analysis will be submitted to the NRC within 30 days of the date of this letter.

KmNt'llN MINHFIlft'j/7, 78ii80078

ROCHESTER GAS AND ELECTRIC CORP. SHEET NO.

DO Mr. Dennis L. Ziemann It should be noted that the Exxon Nuclear fuel will be loaded on the core periphery for Cycle 8 operation and will, therefore, operate well below the licensed peaking factors used in the ECCS analysis. Thus, the peak clad temperature calculated for the on Exxon fuel is extremely conservative since operation at the licensed peaking factors.

it is based Very truly yours, L. D. White, Jr.