ML19341B135
| ML19341B135 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 01/27/1981 |
| From: | Heider L VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| FVY-81-14, NUDOCS 8101300315 | |
| Download: ML19341B135 (2) | |
Text
14 VERMONT Y AN KEE NUCLEAR POWER CORPORATION SEVENTY SEVEN GROVE STREET 2.C.2.1 RuTLAso, VEMMONT 05701 FVY 81-14 recy vo.
ENGINEERING OFFICE 1671 WORCES,TER ROAD FR AMINGH AM, M ASS ACH US ETTS 01701 veterwoussyrjevaeioo e
January 27, 1981 L
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g United States Nuclear Regulatory Commission O
[j Washington, D.C.
20555 Attention:
Mr. Darrell G. Eisenhut, Director Office of Nuclear Reactor Regulation Division of Licensing
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b) USNRC letter, D. G. Eisenhut, to All BWR Licensees, dated October 1, 1980 (c) VYNPC letter (WVY 80-153) to USNRC, dated October 22, 1980 (d) USNRC letter to All BWR Licensees, dated December 9, 1980; Generic Safety Evaluation Report (e) General Electric Service Information letter (SIL No. 331, Supp. 4), dated October 13, 1980 (f)
INPO/NSAC Significant Operating Experience Report 80-6, dated December 19, 1980
Subject:
Dear Sir:
Sy letter, dated October 1,1980 [ Reference (b)], Vermont Yankee was requested to perform an evaluation which compared the installed scram discharge system design against the functional, safety, operational, design, and surveillance criteria developed by a Sub-Group of the BWR Owners Group.
Reference (b) further requested that we provide the NRC with the results of our evaluation including proposed modifications, if required, and a schedule for their implementation.
Based on the results of our evaluation, a review of other industry and NRC-generated documents [ References (d), (e), and (f)} and our perspective of other current issues, we feel that certain system modifications should be implemented to further enhance system availability and reliability. The major elements of our improvement program are summarized as follows:
1.
Installation of two, independent instrument volumes (IV) and associated instrumentation attached to the low point of each scram discharge volume (SDV).
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U. S. Nuclear Regulator Commission January 27, 1981 Attn:
Mr. Darrell G. Eisenhut, Director Page 2
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2.
Installation of additional coolant boundary valves in the vent and drain line piping.
3.
Cross connection of vent lines upstream of the vent valves to provide redundancy without the addition of active components.
(This change was implemented during the 1980 refueling outage).
As documented in Reference (c), we will use the Owner's Sub-Group design and performance criteria as the basis for developing the required system modification detailed designs.
Unless our schedule is altered, by as yet unforeseen equipment delivery problens, we expect to have our long-term scram discharge system improvements program completed by the 1983 refueling outage.
We trust that this information adequately responds to Reference (b);
however, should you desire additional information, do not hesitate to contact us.
Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION O
L. H. Heider Vice President RJW/jgh Attachment COMMONWEALTH OF MASSACHUSETTS)
)ss COUNT" 0F WORCESTER
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Then personally appeared before me, L. H. Heider, who, being duly sworn, did state that he is a Vice President of Vermont Yankee Nuclear Power Corporation, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Vermont Yankee Nuclear Power
- l Corporation, and that the statements therein are true to the best of his i
knowledge and belief.
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Robert H. Groce Notary Public My Commission Expires September 14, 1984 e,
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