ML18142A704
| ML18142A704 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/17/1978 |
| From: | White L Rochester Gas & Electric Corp |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18142A704 (4) | |
Text
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REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS >
DISTRIBUTION FOR INCOMING MATERIAL 50-244 REC:
ZIEMANN D L ORG:
WHITE L 9 DOCDATE: 04/17 J'78 NRC ROCHESTER GAS
- 8. FLEC DATE RCVD: 04121/78 DOCTYPE:
LETTER NOTARIZED; NO COPIES RECEIVED
SUBJECT:
LTR 1
ENCL 0 FURNISHING INFO RE LOGIC INCONSISTENCY IDENTIFIED BY WESTINGHOUSE IN LOCA ECCS EVAI UATION MODEL OF APPLICANT"S SUBJECT FACILITY PERTAINING TO HEATING FFFECT OF THE ZIRCALLOY/WATER REACTION... ADVISING WESTINGHOUSE WILL REANALYZE LIMITING BRFAK -." SUBJECT sac i ~Y-FoC.
PLANT NAME: RE GINNA UNIT 1 REVIEWER INITIAL:
XJM DISTRIBUTOR INITIAL:
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'.>> T044 ROCHESTER GAS AND ELECTRIC CORPORATION e
89 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE, JR.
VICE PRESIDENT TELEPHONE AREA COOK Tld 546.2700 April 17, 1978 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis L. Ziemann, Chief Operating Reactors Branch N2 U.S. Nuclear Regulatory Commission Washington, D. C.
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Dear Mr. Ziemann:
This letter is in response to a request from a member of your Staff and addresses a logic inconsistency recently identi-fied by our vendor, Westinghouse Electric Corporation, in their LOCA ECCS Evaluation Model.
On March 24,
- 1978, we were notified by Westinghouse that they had determined that their Evaluation Model did not fully account for the heating effect of the Zircalloy/
water reaction.
Since that time, Westinghouse has performed addi-tional analyses in which they determined the impact on peak clad tem-perature of including the Zircalloy/water reaction in their present models.
These analyses indicate that, taking full account of the Zircalloy/water reaction, and without making other changes in the model, Ginna continues to meet the limits specified in 10 CFR Section 50.46 while operating at the present Technical Specification limits.
- Thus, no interim restrictions are required.
This conclu-sion is a result of the large margin to limits and to the assumed level of steam generator tube plugging which existed in the pre-vious analysis.
Westinghouse has informed us that they have submitted several proposed changes to their Evaluation Model to the NRC for review, including a change to fully account for the Zircalloy/water re-action.
Following approval, Westinghouse will reanalyze the limiting break for R.
E. Ginna for our submittal to you.
Very truly yours, L. D.
W 'te, Jr.
78ii10025
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