ML19256F034

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Responds to IE Bulletin 79-14,Revision 1,Suppls 1 & 2, Re Seismic Analyses for as-built safety-related Piping Sys. Impractical to Inspect Pipes Being Designed & Constructed W/New Tolerance Specs.Current Procedures Adequate
ML19256F034
Person / Time
Site: Limerick  Constellation icon.png
Issue date: 10/30/1979
From: Boyer V
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-79-14, NUDOCS 7911210020
Download: ML19256F034 (2)


Text

Yk PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHI A, PA.19101 (2151841-4500 V.S.BOYER vica-aassionat Mr. Boyce H. Grier, Director, Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

SUBJECT:

NRC Region I Letters dated July 2, 1979, July 18, 1979, August 15, 1979 and September 7, 1979 RE: IE Bulletin No. 79-14 Seismic Analysis for As-Built Safety-Related Piping Systems Limerick Generating Station, Units Nos. 1 and 2 Docket Nos. 50-352 and 50-353

Dear Mr. Grier:

Philadelphia Electric Company has reviewed IE Bulletin 79-14 including Revision 1 and Supplements 1 and 2 submitted with the subject letters.

Since safety-related piping systems at the Limerick Generating Station are still being designed and constructed, we consider it impractical to inspect portions of these systems at this time. Procedures and specifications have been established to ensure that all field changes are reviewed to determine their effect upon the seismic analyses. The specifications contain tolerances that allow field changes to be made that will have an insignificant effect upon the seismic analyses. Any changes outside these tolerances require that design documents be revised and the revised documents be reconciled with the analyses.

Prior to any safety-related system being operated, the piping will be walked-down by stress analysts to ensure that the seismic analyses apply to the actual configuration of the piping. We will also establish modification pro-cedures to ensure that, after safety-related systems are put into operation, any modifications to the piping are in compliance with the required seismic 13/5 223 7911210 0 2 O k

Mr. Boyce H. Grier - (continued) Page 2 criteria. These procedures will require that design documents be revised and, where necessary, new seismic analyses be prepared. Thus, we will, at all times, have seismic analyses that reflect the as-built condition of safety-related piping.

Sincerely, V. S. Boyer JFO'R/dh15/3 Copy to: U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555 ,

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