ML20137L347

Notifies That Deferral of Installation of Ref Leg Mods to Reactor Vessel Water Level Instrumentation Until 1987 Refueling Outage Acceptable,Per Response to Generic Ltr 84-23

ML20137L347
Person / Time
Site:	Vermont Yankee
Issue date:	09/06/1985
From:	Vassallo D Office of Nuclear Reactor Regulation
To:	Capstick R VERMONT YANKEE NUCLEAR POWER CORP.
References
GL-84-23, NUDOCS 8509120388
Download: ML20137L347 (3)

Text

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September 6, 1985 4

Docket No. 50-271 DISTRIBUTION ^ 0 ELD AEDocket File;"

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- NRC PDR ~ ELJordan Local PDR JPartlow ORB #2 Reading BGrimes Mr. R. W. Capstick HThompson ACRS (10)

Licensing Engineer SNorris- Gray File

, Vermont Yanke? Nuclear Power Corporation 1671 Worcester Road Framingham, Massachusetts 01701

SUBJECT:

REACTOR VESSEL WATER LEVEL INSTRUMENTATION IMPLEMENTATION Re: Vermont Yankee Nuclear Power Station By Generic Letter (GL) 84-23, dated October 26, 1984, the staff provided concerns related to Reactor Vessel Water Level Instrumentation adequacy in BWR's and requested you to provide a description and schedule for proposed improvements. By letters dated Cecember 6, 1984 and March 28, 1985, you indicated that the existing Yarway columns and cold reference leg columns would be replaced by a dual cold reference leg arrangement and proposed to implement this design change during Vermont Yankee's 1985-1986 outage, scheduled to start in September 1985. By letter dated May 24, 1985, the

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staff accepted the proposed modifications and implementation scheduled.

By letter dated July 18, 1985, you indicated that detailed design of the reference leg modifications requires field verification of the existing drywell configuration prior to finalizing the new reference leg support design. You concluded that, due to the need for indrywell field verification, the subsequent detailed engineering necessary to provide a final modified reference leg design, and the work effort in the drywell associated with the recirculation system piping replacement, the I installation of reference leg modifications during the 1985-1986 outage were not achievable. You, therefore, requested NRC concurrence to defer the installation of reference leg modifications from the 1985-1986 outage to the next scheduled refueling outage in 1987.

We have reviewed )]ur requested modification implementation deferral. In GL 84-23 the staff concluded that emergency procedure changes as identified in the BWR Owner's Group Emergency Procedures Guidelines, addressing concerns relative to reactor vessel water level instrumentation, are adequate for the short-term. By letter dated June 6,1985 we approved your commitment to implement upgraded Emergency Operating Procedures addressing these concerns prior to the startup from the 1985-1986 outage.

4 8509120388 85090621 DR ADOCK O

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l' s. Mr. R. W. Capstick .

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Considering the significant work effort in,the drywell planned for the 1985-1986 outage and your consnitment to . implement the upgraded Emergency Operating Procedures prior to startup from the 1985-1986 outage, the staff finds that there is adequate justification for deferral of the schedule for modifications to the Reactor Vessel Water Level Instrumentation to the 1987

. refueling outage.

Sincerely, -

Original ~ signed by/

Domenic B. Vassallo, Chief  ;

Operating Reactors Branch #2 j Division of Licensing cc: See next page r

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. Mr. R. W. Capstick Vermont Yankee Nuclear Power Corporation Vermont Yankee Nuclear Power Station cc:

Mr. W. F'. Conway W. P. Murphy, Vice President &

President & Chief Executive Officer Manager of Operations Vermont Yankee Nuclear Power Corp. Vermont Yankee Nuclear Pcwer Corp.

R. D. 5, Box 169 R. D. 5, Box 169 Ferry Road Ferry Road Brattleboro, Vermont 05301 Brattleboro, Vernont 05301 Mr. Donald Hunter, Vice President Mr. Gerald Tarrant , Comnissioner Vermont Yankee Nuclear Power Corp. Vermont Department of Public Service 1671 Worcester Road 120 State Street Franingham, Massachusetts 01701 Montpelier, Vermont 05602 New England Coalition en Nuclear Pollution Hill and Dale Farm Public Service Board R. D. 2, Box 223 State of Vermont Putney, Vermont 05346 120 State Street Montpelier, Vermont 05602 Mr. Walter Zaluzny Chairman, Board of Selectman Vermont Yankee Decommissionirg Post Office Box 116 Alliance Vernon, Vermont 05345 Box 53 s Montpelier, Vermont 05602-0053 J. P. Pelletier, Plant Manager Vermont Yankee Nucl'e ar Power Corp.

Post Office Box 157 Resident Inspector Vernon, Vermont 05354 U. S. Nuclear Regulatory Commission Raymond N. McCandless Post Office Box 176 Vernon, Vertent 05354 Vermont Division of Occupational A Radiological Health Vermont Public Interest Adninistration Building Research Group, Inc.

10 Baldriin Street 43 State Street Montpelier, Vermont 05602 Montpelier, Vermont 05E02 Honorable John 3. Easton Thomas A. Murley Attorney General Regional Adninistrator State of Verront Region I Office

'109 State Street U. S. fluclear Regulatory Connission s Montpelier, Vermont 05602 631 Park Avenue King of Prussia, Pennsylvania 19406 John A. Ritscher, Esquire Ropes ~& Gray 225 Franklin Street Boston, Massachusetts 02110 l

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