ML19211A241

Updates Review of Seismic Analyses for as-built safety- Related Piping Per IE Bulletin 79-14, Seismic Analysis for Safety-Related Piping Sys.

ML19211A241
Person / Time
Site:	Peach Bottom
Issue date:	10/30/1979
From:	Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-79-14, NUDOCS 7912170240
Download: ML19211A241 (2)

Text

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PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 SHIELD'S L DALTROFF ELacta c Pn o crion October 30, 1979 Re: Docket Nos. 50-277 50-278 IE Bulletin 79-14 Mr. Boyce H. Grier, Director Office of Inspection & Enforcement Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. G rie r :

This letter updates the status of Bulletin 79-14 concerning the review of seismic analyses for 'as-built' safety-related piping.

The inspection and measurement of 31,425 feet of piping has been c o mp le t e d , except for the removal of insulation and inspection of welded attachments which are in p rogress. This quantity of piping includes 98.8 % of Units 2 and 3 accessible piping and 98.6 % of Unit 3 and common inaccessible piping that required inspection by Bulletin 79-14. The inspection and measurement of Units 2 and 3 accessible piping and Unit 3 inaccessible piping will be completed by the end of the current refueling outage. Unit 2 inaccessible piping will be completed during the Spring, 1980 Unit 2 refueling outage.

As of O ct obe r 27, 1979, stress analy s ts had received approximately 27,400 feet of 'as-built' inf ormation from the field and had compared the field 'as-built' data with the seismic analysis input data for approximately 22,400 feet of this piping.

Approximately 3,760 feet of the 22,400 feet have received a final engineering evaluation. It has been determined that seven seismic analyses need to be redone as a result of identified 1591 195 7 912170 2 64C)

.i Mr. Boyce H. Grier Page 2 nonconformances. Four of the seven reanalyses have been completed and the results are acceptable. Of the 28 nonconformances identified thus far, only one has been judged to affect the operability of a system. This nonconformance, rep orted in LER 3-79-29/ IP will be res olved p rior to Unit 3 returning to service.

It is anticipated that the inspection and review of accessible piping and all Unit 3 inaccessible piping will be completed by December 15, 1979, at which time a report of the results of the review will be f orwarded t o y ou.

Very t ruly y ou rs ,

s' ' /' ' /'~

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