ML20154K193

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Forwards Request for Addl Info Re Containment Vessel Structural Integrity Application
ML20154K193
Person / Time
Site: Callaway Ameren icon.png
Issue date: 05/16/1988
From: Alexion T
Office of Nuclear Reactor Regulation
To: Schnell D
UNION ELECTRIC CO.
References
TAC-59771, NUDOCS 8805270286
Download: ML20154K193 (3)


Text

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May 16, 1988 Docket No. 50-483 DISTRIBUTION:

Docket riles NRC & Local PDRs PDIII-3 r/f ' 'XPerkins GHolahan PKreutzer TAlexion 0GC-WF1 Mr. Donald F. Schnell EJordan JPartlow Vice President - Nuclear GBagchi ACRS(10)

Union Electric Company PDIII-3 Gray Files Post Office Box I49 St. Louis, Missouri 63166

Dear Mr. Schnell:

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING CONTAINMENT VESSEL STRUCTURAL INTEGRITY APPLICATION (TAC #59771)

The staff is continuing its review of your September 18, 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 inform 6 tion affects fewer than 10 respondents; therefore, OMB clearance is not required under Pub. L.96-511.

Sincerely,

/s Thomas W. Alexion, Project Manager Project Directorate III-3 Division of Reactor Projects - III, IV, Y and Special Projects

Enclosure:

As stated cc: See next page gypd d# //S Office: LA/PDIII-3 '

P D MEB PD/ III-Surname: PKreu'tzer wt GBag KPerkins Date: 3 /g /88 7 p/88 b /lb/88 f//J/88 8805270286 680516 PDR P ADOCK 05000483 pg t-

Mr. D. F. Schnell Callaway Plant Union Electric Company Unit No. 1 cc:

Dr. J. O. Cermack Mr. Bart D. Withers CFA Inc. President and Chief 4 Professional Dr., Suite 110 Executive Officer Gaithersburg, MD 20879 Wolf Creek Nuclear Operating -

Corporation Gers1d Chernoff, Esq. P. O. Box 411 Thomas A. Baxter, Esq. Burlington, Kansas 66839 Shaw. Pittman, Potts & Trowbridge 2300 N Street, N. W. Mr. Dan I. Bolef, President Washington, D. C. 20037 Kay Drey, Representative Board of Directors Coalition Mr. T. P. Sharkey for the Environment Supervising Engineer, St. Louis Region Site Licensing 6267 Delmar Boulevard Union Electric Company University City, Missouri 63130 Post Office Box 620 Fulton, Missouri 65251 U. S. Nuclear Regulatory Commission Resident inspectors Office RRf1 Steedman, Missouri 65077 Mr. Alan C. Passwater, Kinager Licensing and fuels Union Electric Company Post Office Box 149 St. Louis, Missouri 63166 Manager - Electric Department Missouri Public Service Commission 301 W. High Post Office Box 360 Jefferson City, Missouri 55102 Regional Administrator U. S. NRC, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. Ronald A. Kucera, Deputy Director Department of Natural Resources P. O. Box 176 Jef ferson City, Missouri 65102

gQUESTFORADDITIONALINFORMATION Any of the conditions, viz: (1) the aver 6ge prestressing forces of the sampled tendens falling below the minimum required prestress; (2) more than one tendon force out of three adjoining tendons falling between their predicted lower bound force and 90% of the lower bound; or (3) any of the sampled tendons falling below 90% of its credicted lower bound, could be indicative of gross containment capacity deterioration, if the sampled tendon results are extrap-olated to the entire population in a greup. Although it is recognized that a condition representing such an extrapolation is highly unlikely, the availability-of the containnent to withstand the designated loadings could be questioned.

For those cases of extrapolation of conditions 1, 2 or 3 above, provide justifi-cation to show why the plant should be allowed to keep on operating for the 15-day period proposed in the technical specification amendnent. An acceptable way to justify the proposed amendment is to use a statistically based evaluation.

That evaluation could demonstrate the performance of similarly fabricated and protected tendons, with a 95% 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 containment cannot withstand the design basis loadings under the FSAR-designated acceptance criteria and design margins.

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