ML20133K574
| ML20133K574 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 10/16/1985 |
| From: | Randazza J Maine Yankee |
| To: | NRC OFFICE OF ADMINISTRATION (ADM) |
| Shared Package | |
| ML20133K577 | List: |
| References | |
| 6454L-SDE, MN-85-180, NUDOCS 8510220160 | |
| Download: ML20133K574 (2) | |
Text
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EDISON DRIVE MAME HARHEE AToml0POWERCOMPARUe avausra, unine o<sas kkf October 16, 1985 (20a 623 3521 MN-85-180 Proposed Change No. 121 g
Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Document Control Desk
References:
(a) License No. OPR-36 (Docket No. 50-309)
(b) USNRC Generic Letter 84-15. dated July 2, 1984 (c) M(APCo Letter to USNRC dated September 26, 1984 (MN-84-166)
Subject:
Proposed Change No.121 - Diesel Generator Testing Gentlemen:
As indicated in Reference (c), Maine Yankee proposes to delete the present Technical Specification requirement for emergency diesel generator testing in the event that any component in one train of the emergency core cooling system (ECCS) becomes inoperable. Over the past several years, industry operating data regarding diesel generator performance indicates that too frequent testing of the diesels can be detrimental to their availability.
The specific change is as follows:
Replace page 3.6-2 of the Maine Yankee Technical Specifications with the enclosed page 3.6-2.
Title 10 of the Code of Federal Regulations, Section 50.92 states, in part, that a proposed technical specification involves a significant hazards consideration if it (1) involves a significant increase in the probability or consequences previously analyzed; (2) creates the possibility of a new or different kind of accident from any accident previously evaluated; or (3) involves a significant reduction in a margin of safety.
We have performed an evaluation in accordance with 10 CFR 50.91(a)(1) to determine whether this proposed change involves a significant hazards consideration as defined by 10 CFR 50.92. A summary of our evaluation follows.
The accidents analyzed in the Maine Yankee Final Safety Analysis Report (FSAR) were evaluated. It was concluded that the proposed change would not cause a significant increase in the probability or consequences of the accidents analyzed in the FSAR. In fact, based on industry dats and the Staff's evaluation in Reference (b), limiting the number of cold starts as proposed helps ensure higher diesel generator reliability by eliminating excessive testing that degrades diesel engines.
The consequences of a loss of coolant accident are not affected by the proposed change since the reliability of the diesel generators continues to be adequately demonstrated thro h required testing.
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United States Nuclear Regulatory Commission Page Two Attention: Document Control Desk MN-85-180 The proposed change does not create the possibility of a different kind of accident from any previously analyzed since the elimination of excessive diesel generator testing minimizes diesel engine degradation.
Furthermore, the requirement to test, within two hours, the remaining ECCS component subsystem if the respective subsystem in the redundant train becomes inoperable and the inoperable system restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of discovering the nonconformance, maintains the margin of safety necessary to ensure that a reliable source of cooling water exists to mitigate the most limiting loss of coolant accident.
Based on the above evaluation, we have concluded that the proposed change does not involve a significant hazards consideration as defined by 10 CFR 50.92.
An application fee of $150.00 is enclosed for this amendment request.
The State of Maine is being notified of this request by a copy of this letter.
Very truly yours, MAINE YANKEE ATOMIC POWER COWANY Wh: Ap John B. Randazza Executive Vice President SDE/Djp
Enclosure:
A.
Proposed Changes to Specification 3.6 (1 page) 8.
Application Fee - $150.00 cc: Mr. Edward J. Butcher, Jr.
Dr. Thomas E. HJrley Mr. Cornelius F. Holden Mr. Clough Tcopan STATE OF MAItE Then personally appeared before me, John B. Randazza, who, being duly sworn, did state that he is Executive Vice President of Maine Yankee Atomic Power Company, tnat he is duly authorized to execute and file the foregoing request in the name and on the behalf of Maine Yankee Atomic Power Company, and that the statements therein are true to the best of his knowledge and belief.
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/ +, y a Notary Public GERALDINE E. DOWNER NOTARY PueUC - YTATE or MAMf My cowusssent EpWs 6454L-SDE