ML20052F727
| ML20052F727 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 05/03/1982 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Rich Smith VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| 820503, NUDOCS 8205130508 | |
| Download: ML20052F727 (3) | |
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Docket No. 50-271 MAY 3 1982 A
Hr. Robert L. Smith R
Licensing Engineer f
y Vermont Yankee Nuclear Power n/
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(9 1671 Worcester Road
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Dear Mr. Smith:
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Subject:
Operation of Purge and' Vent Valves U derlInerted' Conditions
Reference:
Letter March 26, 1982 from Vemont Yankee Nuclear Power Corporation (Vemont Yankee Nuclear Power Station)
In your letter dated March 26, 1982 you infomed us of the manner in which you propose to operate the containment purge and vent valves in complying with the requirements of 10 CFR 50.44 to operate with an inerted containment by May 4,1982 and asked that we review your proposal.
Our review of your proposal considered only the changes between your previous manner of operation and your proposed manner of operation. However, other requirements may develop upon completion of our long-tem review of the containment purge and vent issue.
We conclude that operation in the manner you describe is acceptable, except that during modes other than cold shutdown or refueling valve S0-16-19-9 l
is required to be sealed closed, as defined in M-*rd Review Plan Section 6.2.4. Item II.6.f.
The reason for this a wirement is that we have infomation from the valve manufacturer that itIds us to believe that for this val'e in its present orientation high torques could exist even in the very low angles of opening. This indicates the interim position 0 and of partially blocking the valve to a maximum opening of between 35 500.ay not sufficiently reduce the high torques imposed on this valve from a LOCA. You should provide justification by means of additional test /
analysis work in order to use valve SB-16-19-9 in its present orientation or l
reorient this valve.
Our conclusion is based on our underst'anding from discussions with your staff that your proposed manner of operation involves no changes in logic or circuitry. Please infom us if this is not correct.
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Mr. Robert L. Smith 2
In addition, please provide us with your estimate of the maximum number of hours per year you expect to purge (or vent) and the estimated amount of radioactivity release during the time required to close the valve (s) following a LOCA as compared to 10 CFR Part 100 guidelines. Please provide this information within 30 days of receipt of this letter.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely, Domenic B. Vassallo, Chief Operating Reactors Branch #2 Division of Licensing cc: See next page Distribution:
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OFFICIAL RECORD COPY usom.im-ma unc ronu sia gio-soi etncu 024o
a Mr. Robert L. Smith cc:
Mr. W. F. Conway Public Service Board President & Chief Operating Officer State of Vermont Vermont Yankee Nuclear Power Corp.
120 State Street 411 Western Avenue Montpelier, Vermont 05602 Drawer 2 i
West Brattleboro, Vermont 05301 W. P. Murphy, Plant Superintendent i
Vermont Yankee Nuclear Power Corp.
j Mr. Louis H. Heider, V.P.
P.O. Box 157 i
Vermont Yankee Nuclear Power Corpo.
Vernon, Vermont 05354 I
25 Research Drive I
Westboro, Massachusetts 01581 Vermont Yankee Decommissioning Alliance John A. Ritscher, Esquire 5 State Street Rope & Gray Box 1117, 226 Frankline Street Montpelier, Vermont 05602 i
Boston, Massachusetts 02110 j
Brooks Memorial Library Honorable ' John J. Easton 224 Ma'in Street Attorney General Brattleboro, Vermont 05301 State of Vermont 109 State Street Resident Inspector Montpelier, Vermont 05602 c/o. U.S. NRC P.O. Box 176 Vermont lankee Decommissioning Vernon, Vermont 05453 Alliance 53 Frost Street Ronald C. Haynes Brattleboro, Vermont 05301 Regional Administrator, Region I U.S. Nuclear Regulatory Commission
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631 Park Avenue Mr. E. W. Jackson Manager of Operations King of Prussia, PA 19406 Vermont Yankee Nuclear Power Corp.
411 Western Avenue l
Drawer 2 West Brattleboro, Vermont 05301 Raymond N. McCandless Vermont Division of Occupational l
& Radiological Health Administration Building 10 Baldwin Street
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Montpelier, Vermont 05602 l
New England Coalition on Nuclear
'i Pollution i
Hill and Dale Farm R.D. 2, Box 223 Putney, Vermont 05346 I
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