ML20074A487
| ML20074A487 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 05/11/1983 |
| From: | Sinclair J VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20074A488 | List: |
| References | |
| FVY-83-36, GL-83-08, GL-83-8, NUDOCS 8305130103 | |
| Download: ML20074A487 (1) | |
Text
%
s VERMONT YANKEE NUCLEAR POWER CORPORATION 2.C.2.1 RD 5. Box 169. Ferry Road, Brattleboro, VT 05301 M &%
,,,Ly,g, g
ENGINEERING OFFICE 1671 WORCESTER ROAD FRAMINGHAM, MASSACHUSETTS 01701 TEL EPHONE 617-672-8100 May 11, 1983 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Office of Nuclear Reactor Regulation Mr. Domenic B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b) Letter, USNRC to VYNPC, NVY 83-23, Generic Letter 83-08, dated February 2, 1983
Subject:
Modification of Vacuum Breakers on Mark I Containments
Dear Sir:
Reference (b) requested that we provide you with the results of the plant unique calculations which provide the justification for the as-built acceptability of our vacuum breakers. The requested justification is provided in the enclosed report, " Improved Dynamic Vacuum Breaker Valve Response for Vermont Yankee".
In addition, you should note that in 1980 we changed the valve disc from a cast aluminum disc to a tougher wrought aluminum disc material, thus providing improved resistance to cyclic loading.
We trust that this information is satisfactory; however, should you have any questions, please contact us.
Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION p.'S. AM J. B. Sinclair Licensing Engineer JBS/dd
!0
\\
8305130103 830511 PDR ADOCK 05000271 P
PDR I