ML20154N489

Forwards Request for Addl Info to Continue Review of 851206 Submittal Re Containment Vessel Structure Integrity Application

ML20154N489
Person / Time
Site:	Wolf Creek
Issue date:	05/24/1988
From:	Oconnor P Office of Nuclear Reactor Regulation
To:	Withers B WOLF CREEK NUCLEAR OPERATING CORP.
References
TAC-60265, NUDOCS 8806020319
Download: ML20154N489 (5)

Text

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May 24, 1988 Docket No. 50-482 Mr. Bart D. Withers President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington, Kansas 66839

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING CONTAINMENT VESSEL STRUCTURAL INTEGRITY APPLICATION (TAC NO. 60265)

The staff is continuing its review of your December 6,1985 submittal concerning your containment vessel structural integrity application. The staff requests additional information identified in the enclosure to continue its review.

This request for information affects fewer than 10 respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincgly, Paul W. O'Connor, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, V and Special Projects

Enclosure:

As stated cc w/ enclosure:

See next page DISTRIBUTIONm

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e May 24,1988 Docket No. 50-482 Mr. Bart D. Withers President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington, Kansas 66839

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING CONTAINMENT VESSELSTRUCTURALINTEGRITYAPPLICATION(TACNO.60265)

The staff is continuing its review of your December 6, 1985 subr.ittal concerning your containment vessel structural integrity application. The staff requests additional information identified in the encloscre to continue its review.

This request for information affects fewer than 10 respondents; therefore, OMB clearance is not required under P.L.96-511.

Sinegly, Paul W. O'Connor, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, V and Special Projects

Enclosure:

As stated cc w/ enclosure:

See next page DISTRIBUTION Docket File NRC PDR Local PDR PD4 Reading L. Rubenstein J. Calvo P. Noonan P. O'Connor OGC-Rockville E. Jordan J. Partlow ACRS (10)

PD4 Plant File JCalvo/M PD4/

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May 24, 1988 Docket No. 50-482 Mr. Bart D. Withers President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington, Kansas 66839

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION P.EGARDING CONTAINMENT VESSEL STRUCTURAL INTEGRITY APPLICATION (TAC NO. 60265)

The staff is centinuing its review of your December 6,1985 submittal concerning your containment vessel structural integrity application. The staff requests additional information identified in the enclosure to continue its review.

This request for information affects fewer than 10 respondents; therefore, OMB cicararce is net required under P.L.96-511.

Sincerely, Paul W. O'Connor, Project Manager Project Directorate - IV Division cf Reactor Projects - III, IV, V and Special Projects

Enclosure:

As stated cc w/ enclosure:

See next page l

Mr. Bart D. Withers Wolf Creek Generating Station Wolf Creek Nuclear Operating Corporation Unit No. I cc:

Jay Silberg, Esq.

Mr. Gerald Allen Shaw, Pittman, Potts & Trowbridge Public Health Physicist 1800 M Street, NW Bureau of Air Quality & Radiation Washington, D.C.

20036 Control Division of Environment Chris R. Rogers, P.E.

Kansas Department of Health Manager, Electric Department and Environment Public Service Commission Forbes Field Building 321 P. O. Box 360 Topeka, Kansas 66620 Jefferson City,iiissouri 65102 Mr. Gary Boyer, Plant Manager Regional Administrator, Region III Wolf Creek Nuclear Operating Corp.

U.S. Nuclear Regulatory Commission P. O. Box 411 799 Roosevelt Road Burlington, Kansas 66839 Glen Ellyn, Illinois 60137 Regional Administrator, Region IV Senior Resident Inspector / Wolf Creek U.S. Nuclear Pegulatory Commission c/o V. S. Nuclear Regulatory Commission Office of Executive Director P. O. Box 311 for Operations Burlington, Kansas 66839 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Mr. Robert Elliot, Chief Engineer Utilities Division Mr. Otto Maynard, Manager Licensing Kansas Corporation Commission Wolf Creek Nuclear Operating Corp.

4th Floor - State Office Building P. O. Box 411 Topeka, Kansas 66612-1571 Burlington, Kansas 66839 l

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i ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION Any of ths cer.ditions, viz:

(1) the average prestressing forces of the sampled tendons fal'ing below the minimum required prestress; (2) more than one tendon force out of three adjoining tendons falline between their predicted lower bound force and 90% of the lower bound; or (3) any of the sampled tendons falling below 90T of its predicted lower bound, could be indicative of gross containment capacity deterioration, if the sampled tendon results are extrapo-lated to the entire population in a group. Although it is recognized that a condition representing such an extrapolation is highly unlikely, the availability of the containment to withstand the designated loadings could be questioned.

For those cases of extrapolation of conditions 1. 2 or 3 above, provide justi-fication to show why the plant should be allnwed to keep on operating for the 15-day period proposed in the technical specification amendment. An acceptable way to justify the proposed amendment is to use a statistically based evaluatien. That evaluaticn could demonstrate the perfortnance of similarly fabricated and protected tender.s, with a 951 confidence that there is less than a 5% chance for gross degradation of containment capacity. Gross degradation is defined as a condition of containment under which the containnent cannot withstand the design basis loadings under the FSAR-designated acceptance criteria ard design margins.

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