ML20214T463
| ML20214T463 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 11/24/1986 |
| From: | Rooney V Office of Nuclear Reactor Regulation |
| To: | Capstick R VERMONT YANKEE NUCLEAR POWER CORP. |
| Shared Package | |
| ML20214H099 | List: |
| References | |
| GL-83-08, GL-83-8, NUDOCS 8612080596 | |
| Download: ML20214T463 (3) | |
Text
e NOV 2 41986 Docket No.
50-271 DISTRIBUTION (Docket 111e' NRC & L PDRs Mr. R. W. Capstick Plant Files Licensing Engineer 0GC-Bethesda Vermont Yankee Nuclear Power JPartlow Corporation BGrimes 1671 Worchester Road ACRS (10)
Framingham, Massachusetts, 01701 EJordan SNorris
Dear Mr. Capstick:
WLong DMuller
SUBJECT:
MARK I CONTAINMENT DRYWELL VACUUM BREAKERS VRooney Re: Vermont Yankee Nuclear Power Station Our Generic Letter 83-08 related to modification of vacuum breakers on Mark I containments identified a potential failure mode of the wetwell/drywell vacuum breakers in chugging and condensation oscillation phases of blowdown to the torus during a loss of coolant accident.
In that Generic Letter we requested that the impacted licensees provide a commitment to submit the results of plant unique calculations which either formed the bases for modifications to vacuum breakers or provide justification for their as-built acceptability.
By a letter dated May 11, 1983, you provided a response to Generic Letter 83-08, providing justification for the as-built acceptability of your vacuum breakers. You also informed us that you had changed the disc material in 1980 providing improved resistance to cyclic loading.
On January 17, 1986 we sent you a Request for Additional Information (RAI).
The purpose of this RAI was to obtain verification that the methodology was consistent with the conditions and restrictions prescribed by the staff in its evaluation of the BWROG model.
(Letter from Vassallo to Phefferlen dated December 24,1984). Your reply dated March 10, 1986 confirmed that you used the approved methodology.
The staff's technical assistance contractor, Franklin Research Center (FRC) has reviewed the results of your analysis to verify that the methodology and conclusions are acceptable. Copies of our Safety Evaluation and the FRC Technical Evaluation are enclosed.
8612090596 861124 PDR ADOCK 05000271 P
1 Based on our review, we conclude that the analyses was performed using acceptable methodology and that the vacuum breakers will not be subjected to excessive stress as a result of LOCA chugging and condensation oscillation loads.
This completes our review of Multiplant Action Item D-20 for Vermont Yankee Nuclear Power Station.
Sincerely,
.Grigimmi sired by Vernon L. Rooney, Project Manager BWR Project Directorate #2 Division of BWR Licensing
Enclosures:
As stated cc w/ enclosure:
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OFFICIAL RECORD COPY l
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Vermont Yankee Nuclear Power Corporation Station CC*
Mr. J. G. Weigand Mr. W. P. Murphy, Vice President &
President & Chief Executive Officer Manager of Operations Vermont Yankee Nuclear Power Corp.
Vermont Yankee Nuclear Power Corp.
R. D. 5 Box 169 R. D. 5, Box 169 Ferry Road Ferry Road Brattleboro, Vermont 05301 Brattleboro, Vermont 05301 Mr. Donald Hunter, Vice President Mr. Gerald Tarrant, Commissioner Vermont Yankee Nuclear Power Corp.
-Vermont Department of Public Service 1671 Worcester Road 120~ State Street Framingham, Massachusetts 01701 Montpelier, Vermont 05002 New England Coalition on Public Service Board Nuclear Pollution State of Vermont Hill and Dale Farm 120 State Street R. D. 2, Box 223 Montpelier, Vermont 05602 Putney, Vermont 05346 Vermont Yankee Decommissioning Mr. Walter Zaluzny Alliance Chairman, Board of Selectman Box 53 Post Office Box 116 Montpelier, Vermont 05602-0053 Vernon, Vermont 05345 Resident Inspector Mr. J. P. Pelletier, Plant Manager U. S. Nuclear Regulatory Commission Vermont Yankee Nuclear Power Corp.
Post Office Box 176 Post Office Box 157 Vernon, Vermont 05354 Vernon, Vermont 05354 i
Vermont Public Interest Mr. Raymond N. McCandless Research Group, Inc.
Vermont Division of Occupational 43 State Street
& Radiological Health Montpelier, Vermont 05602 Administration Building 10 Baldwin Street Regional Administrator, Region I Montpelier, Vermont 05602 U. S. Nuclear Regulatory Commission 631 Park Avenue Honorable John J. Easton King of Prussia, Pennsylvania 19406 Attorney General State of Vcrmont 109 State Street Montpelier, Vermont 05602 John A. Ritscher, Esquire Ropes & Gray 225 Franklin Street Boston, Massachusetts 02110
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