ML20128H443

Sser on Util Response to IE Bulletin 80-11 Re Masonry Wall Design.All Walls Fully Qualified

ML20128H443
Person / Time
Site:	Peach Bottom
Issue date:	06/20/1985
From:	NRC
To:
Shared Package
ML20128H441	List: ML20128H437 ML20128H443
References
IEB-80-11, NUDOCS 8507090535
Download: ML20128H443 (2)

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SUPPLEMENTAL SAFETY EVALUATION REPORT MASONRY WALL DESIGN, IE BULLETIN 80-11 PEACH BOTTOM ATOMIC POWER STATIONS UNITS 2 AND 3 DOCKET NOS. 50-277 AND 50-278 1

In the Safety Evaluation Report (SER), the staff concluded that except for five walls (out of a total of 86) qualified by the licensee via the use of the energy balance technique to resist the out-of-plane seismic forces, Items 2(b) and 3 have been fully implemented at the Peach Bottom facility for the remaining walls. The SER also included a staff position on the energy-balance technique and stated that the implementation of this position was required to render the above walls acceptable to the staff.

The licensee in response to the staff position decided to reanalyze these five walls using linear analysis (working stress approach) with higher damping values than those used in the original analysis (Reference 1). The original analysis was based on 2 percent and 5 percent damping values for OBE and SSE load conditions, respectively. In re-analysis, the licensee used 4 percent and 7 percent damping values consistent with the staff acceptance criteria.

The results of the re-analysis indicate that the above five walls can now be qualified in accordance with the conventional working stress methodology consistent with the staff acceptance criteria.

Based on the above findings, the staff concludes that the Items 2(b) and 3 have been fully implemented at Peach Bottom and that there is a reasonable assurance that all safety-related masonry walls at Peach Bottom facility will withstand the specified design load conditions without impairment of (a) wall integrity or (b) the performance of the required function.

Reference:

1. Letter from S. Daltroff of Philadelphia Electric Company to D. Eisenhut of NRC, dated January 9, 1985.

The NRC personnel performed the review for this Supplemental SE: N. Chokshi Dated: June 14, 1985 0507090535 950620 27 DR ADOCK 05

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• Mr. E. G. Bauer, Jr. Peach Bottom Atomic Power Station, Philadelphia Electric Company Units 2 and 3 cc:

Mr. Eugene J. Bradley Mr. R. A. Heiss, Coordinator Assistant General Counsel Pennsylvania State Clearinghouse Philadelphia Electric Company Governor's Office of State Planning 2301 Market Street and Development Philadelphia, Pennsylvania 19101 P.O. Box 1323 Harrisburg, Pennsylvania 17120 Troy B. Conner, Jr., Esq.

1747 Pennsylvania Avenue, N.W. Mr. Thomas M. Gerusky, Director Washington, D.C. 20006 Bureau of Radiation Protection

, Pennsylvania Department of Thomas A. Deming, Esq. Environmental Resources Assistant Attorney General P.O. Box 2063 Department of Natural Resources Harrisburg, Pennsylvania 17120 Annapolis, Maryland 21401 Mr. Albert R. Steel, Chaiman Philadelphia Electric Company Board of Supervisors Mr. R. Fleishmann Peach Bottom Township Peach Bottom Atemic R. D. #1 Power Station Delta, Pennsylvania 17314 Delta, Pennsylvania 17314 Mr. M. J. Cooney, Superintendent General Division - Nuclear Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 Mr. Anthony J. Pietrofitta, General Manager Power Production Engineering Atlantic Electric P. O. Box 1500 1199 Black Horse Pike Pleasantville, New Jersey 08232 Mr. Thomas Johnson U.S. Nuclear Regulatory Comission Peach Bottom Atomic Power Station P.O. Box 399 Delta, Pennsylvania 17314 Mr. Thomas E. Murley, Regional Administrator U.S. Nuclear Regulatory Comission, Region !

631 Park Avenue King of Prussia, Pennsylvania 19406 3

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