ML20074A487

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Forwards Rev 0 to Improved Dynamic Vacuum Breaker Valve Response for Vermont Yankee, in Response to NRC 830202 Generic Ltr 83-08
ML20074A487
Person / Time
Site: Vermont Yankee Entergy 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 ,,,Ly ,g, M &%

g ENGINEERING OFFICE 1671 WORCESTER ROAD

  • 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

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8305130103 830511 PDR ADOCK 05000271 P PDR I