ML20077A890
| ML20077A890 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 07/07/1983 |
| From: | Murphy W VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-SSINS-6820 EVY-83-71, FVY-83-71, IEB-83-03, IEB-83-3, NUDOCS 8307220484 | |
| Download: ML20077A890 (2) | |
Text
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VERMONT YANKEE NUCLEAR POWER CORPORATION 2.C.2.1 FVY 83-71 RD 5. Box 169, Ferry Road. Brattleboro VT 053o1
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ENGINEERING OFFICE 1671 WORCESTER ROAD y
FRAMINGHAM, MASSACHUSETTS 01701 TELEPHONE 617-872-8100 July 7, 1983 U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Attention:
Dr. Thomas E. Murley Regional Administrator
References:
a)
License No. DPR-28 (Docket No. 50-271) b)
USNRC IE Bulletin No. 83-03, Check Valve Failures in Raw Cooling Water Systems of Diesel Generators
Dear Sir:
Subject:
Response to IE Bulletin 83-03
(
This letter is written in response to Reference (b), and is intended to fulfill the reporting requirements thereof. The need for an extension beyond the original date was discussed with the Resident Inspector and approved. We have completed the review and valve integrity verification required by the referenced IE Bulletin with the following results:
1.
A review of the emergency diesel generator cooling water system was per-formed to identify all check valves which are subject to the concerns stated in the Bulletin. At Vermont Yankee, diesel generator cooling water is normally provided by the Service Water system via branch piping from the main Residual Heat Removal Service Water supply headers.
In each of these two branch lines is one 8",150#, cast carbon steel Walworth swing check valve, the function of which is to prevent backflow int the main header when diesel generator cooling water is provided by the RHR SW pumps during operation of the alternate cooling system, as specified in FSAR Section 10.8.
During normal Service Water system operation, they remain open.
These valves, identified as V70-43A and V70-43B, are the only check valves directly in the branch piping which supplies cooling water to the diesel generator.
2.
During the 1983 Refueling Outage, radiographic examination of V70-43A and B was performed to determine whether the valve discs had become separated from the pivot arms. These examinations have. confirmed that the valve discs are still intact and properly positioned for normal operation.
A review of our records reveals there have been no previous failures of these valves.
8307220484 030707 PDR ADOCK 0500027 PD o
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. W.S. Nuclear Regulatory Commission 7
7, 1983 VERMONT YANKEE NUCLEAR POWER CORPORATION g3 2 3.
These check valves will be included'in the Inservice Testing Program at the next revision, and will be verified to open during normal monthly diesel generator surveillance testing.
Furthermore, positive verification of internal integrity will be performed by radiographic examination once every five years, coincident with scheduled refueling outages.
We trust that this letter will satisfy the reporting requirements of Bulletin Action Items 4 and 5.
If you need any further information, please do not hesitate to contact us.
Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION h
[
Warren P.
rphy Vice President and Manager of Operations WPM /dm STATE OF VERMONT ss WINDHAM COUNTY )
Then personally appeared before me, W.P. Murphy, who, being duly sworn, did state that he is Vice President and Manager of Operations of Vermont Yankee Nuclear Power Corporation, that he is duly authorized to execute and file the foregoing document in the name and on the behalf of Vermont Yankee Nuclear Power Corporation and that the statements therein are true to the best of his knowledge and belief.
J
[4.E CCp8 Diane T. McCue 8
] ~ Notary Public My Commission Expires February 10, 1987 i
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