ML20059A221

Forwards Evaluation of Cen 387-P, Pressurizer Surge Line Thermal Stratification. Info Provided by C-E Owners Group in Ref 1 & 2 Inadequate to Justify Meeting All Appropriate Limits for 40-yr Plant Life

ML20059A221
Person / Time
Site:	Fort Calhoun
Issue date:	08/17/1990
From:	Bournia A Office of Nuclear Reactor Regulation
To:	Gates W OMAHA PUBLIC POWER DISTRICT
Shared Package
ML20059A222	List: ML20059A221 ML20059A229
References
IEB-88-011, IEB-88-11, TAC-72134, NUDOCS 9008220169
Download: ML20059A221 (4)

Text

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Docket No. 50-285 Mr. W. Gary Gates Division Manager - Nuclear Operations Omaha Public Power District 444 South 16th Street Mall Mail Stop BE/EP a Omaha, Nebraska 68102-2247

SUBJECT:

NRC BULLETIN NO. 88-11. " PRESSURIZER SURGE LINE THERMAL STRATIFICATION" - EVALUATION OF COMBUSTION ENGINEERING OWNERS GROUP BOUNDING ANALYSIS (TAC NO. 72134)

By letters dated Septen6er 21,1989, and April 4, 1990, Omaha Public Power District (OPPD) responded to item 1.b of NRC Bulletin No. 88-11. " Pressurizer Surge Line Thermal Stratification." The letters stated that OPPD supported the bounding analysis performed by the Combustion Engineering Owners Group (CE0G)

'or which Fort Calhoun Station is applicable.ndicated that the integrity of the pressurizer surge The analysis in satisfies the ASME Section III Code criteria for the life of the plant, taking into account the effects of thermal stratification. However, for Fort Calhoun Station OPPD determined all but two of the supports have been determined to be adequate. As specified by the generic letter, OPPD has met all of the requirements required to be taken for such condition, i.e., additional analyses are being performed, visual inspections were performed, and a justification for continued operation has been submitted. The inspections revealed that no evidence of damage or unacceptable conditions were found. OPPD will perform any needed modifications by the end of the 1991 refueling outage to rectify the problem, if future work indicates such action is required.

The staff has completed its review of the CEOG bounding analysis and finds that although sufficient information has been provided to justify continued plant operation un'.11 Fort Calhoun Station completes its final report in accordance with the schedule delineated by the Bulletin, adequate bases have not been provided for the staff to conclude the PSL meets all appropriate. Code limits for 40-year plant life.

A copy of the evaluation (Enclosure 1), which was sent to the CEOG, is enclosed for your information. Also enclosed (Enclosure 2) is the staff's evaluation of CE's response to items discussed during a September 1989 audit at CE's office.

0 PPD may work collectively through the CEOG effort to address the issues identified in the evaluation, but OPPD is responsible to ensure that the Bulletin requested actions are fully implemented at Fort Calhoun Station.

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The staff will assess the conformance of the PSt. to applicable rodes and regulatory requirements for 40-year plant life when the CEOG :eport regarding Item 1.d of the Bulletin is submitted.

Sincerely, (W % w h+a.M Anthony Bo,urnia, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects - III IV, V and Special Projects Office of Nuclear Reactor Regulation

Enclosures:

As stated ccw/ enclosures:

See next page

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Mr. ii. Gary Gates Omaha Public Power District Fort Calhoun Station, Unit No. 1 cc:

Harry H. Voigt. Esg.

LeBoeuf, Lart, Leiby l. itacRae 1333 New Hampshire Avenue, NW Washington, D.C.

P0036

- Mr. Jack Jensen, Chairman Washington County Board of Supervisors Blair,tiebraska 68008 l'r Raymond P. iiullikin, Resident inspector lU.S. Nuclear-Regulatory Comission Post Office Box 309 fort Calhoun, Nebraska 68023 l

tir. Charles B. Brinkman, Manager Washington Nuclear Operations Combustion Engineering, Inc.

12300 Twinbrook Parkway, Suite 330 Rockville, MD 20852 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 611 Pyan Plaza Drive, Suite 1000 Arlington, Texas 76011 Harold Borchert, Director Division of Radiological Health Nebraska Department of Health 301 Centennial Mall, South Post Office Box 9500/

Lincoln, Nebraska o8509 Mr. T. L. Patter',on, Manager Fort Calhoun Station Post Office Box 399 Fort Calhoure, Nebraska 68023

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2 The staff will assess the conformance of the PSL to a1plicable Codes and regulatory requirements for 40. year plant life when tie CEOG report regarding Item 1.d of the Bulletin is submitted.

h, Sincerely, ortsimmiaissedWi Anthony Bournia, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects - III IV, Y anu' Special Projects Office of Nuclear Reactor Regulation

Enclosures:

As stated cc w/ enclosure:

See next page DISTRIBUTION N

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08/$1/90 OfflCIAL RECORD COPY-Document Name:

FT CALHOUN CE PSL TAC 72134