ML20246E287

Informs of Implementation Schedule for Item 1.b of NRC Bulletin 88-011, Pressurizer Surge Line Thermal Stratification Agreed Upon at 890411 Meeting W/Westinghouse Owners Group.Analyses Should Be Available by End of May

ML20246E287
Person / Time
Site:	Prairie Island
Issue date:	05/04/1989
From:	Diianni D Office of Nuclear Reactor Regulation
To:	Musolf D NORTHERN STATES POWER CO.
References
IEB-88-011, IEB-88-11, TAC-72157, TAC-72158, NUDOCS 8905110214
Download: ML20246E287 (4)

Text

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May 4, 1989 Dockets Nos. 50-282 and 50-306 Mr. D. M. Musolf. Manager Nuclear Support Senvices Northern States Powe* Company 414 Nicollet Mall Minneapolis, Minnesota 55401

SUBJECT:

SCHEDULAR RELIEF REQUEST RELATED TO NRC BULLETIN 88-11,

" PRESSURIZER SURGE LINE THERMAL STRATIFICATION", ITEM 1.b (TACS NOS. 72157 AND 72158)

The purpose of this letter is to inform you of the implementation schedule for Item 1.b of NRC Bulletin 88-11, " Pressurizer Surge Line Thermal Stratifi-cation" that was ntually agreed upon between the NRC staff and the Westinghouse Owners Group (WOG) during an April 11, 1989 meeting.

By letter dated February 24, 1989, Northern States Power Company (licensee),

for the Prairie Island Nuclear Generating Plant, proposed an alternate schedule for the completion of the bounding analysis required by Item 1.b of NRC Bulletin 88-11 regarding the design adequacy of the pressurizer surge line, taking into account the effects of thermal stratification.

The proposed schedule for completion consisting of two years from the receipt of the Bulletin was premised on your participation in the Westinghouse Owners Group (WOG) program.

As a result of the~ April 11, 1989 meeting, the WOG agreed to notify its membership that they should, by the end of May 1989, complete and have available for NRC audit, their bounding analysis as related to Item 1.b of the Bulletin, and submit to the NRC a Justification for Continued Operation (JCO) in the event the results of the bounding analysis do not confirm the adequacy of the pressurizer surge line for the design life of the plant.

It is our understanding that the WOG will provide you with a " generic" bounding analysis, to which your plant specific variables (eg., seismic and thermal loadings) will need to be added and incorporated.

Your analysis should assess all aspects of thermal stratification and thermal striping, inckding bounding evaluations on stresses and fatigue, based on currently availat h information.

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Based upon your participation in the WOG program regarding this issue, it is our_ expectation that your efforts will be consistent with that of the WOG.

Sincerely, 9

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Dominic C..Dilanni, Project Manager Project Directorate III-1 Division of Reactor Projects - III, IV, V and-Special Projects Office of Nuclear-Reactor Regulation cc:

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4 Based upon your participation in the WOG program regarding this issue, it is our expectation that your efforts will be consistent with that of the WOG.

Sincerely, Original Signed By Dominic C..DiIanni, Project Manager Project Directorate III-1 Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

See next page DISTRIBUTION Docket: File NRC & Local'PDR MVirgilio PShuttleworth DDilanni OGC EJordan BGrimes ACRS (10)

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Mr. D. M. Musolf Prairie Island Nuclear Generating

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' CC' Gerald Charnoff, Esq.

Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.W.

Washington, DC 20037 Dr. J. W. Ferman.

Minnesota Pollution Control Agency 520 Lafayette Road St. Paul, MN 55155 Mr. E. L. Watzl, Plant Manager Prairie Island Nuclear' Generating Plant Northern States Power Company Route 2 Welch, Minnesota 55089

'Jocelyn F. Olson, Esq.

Assistant Attorney General Environmental Protection Division Suite 200 520 Lafayette Road St. Paul, Minnesota 55155 U.S. Nuclear Regulatory Commission Resident Inspector's Office 1719 Wakonade Drive East, Welch, Minnesota 55089 Regional Administrator, Region III U.S. Nuclear Regulatory Commission w

Office of Executive Director for Operations 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. William Miller, Auditor Goodhue County Courthouse Red Wing, Minnesota 55066 L _ _ - - _ - _ - - - - - _ - - - - - - - _ - -