ML19290B652

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Responds to IE Bulletin 79-14 Re Seismic Analysis for safety-related Piping Sys.Seismic Analysis of safety-related Piping 2 1/2-inch Diameter & Greater Accurately Reflects Actual Installation
ML19290B652
Person / Time
Site: Shoreham File:Long Island Lighting Company icon.png
Issue date: 10/30/1979
From: Novarro J
LONG ISLAND LIGHTING CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-79-14, NUDOCS 7912130451
Download: ML19290B652 (2)


Text

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LONG ISLAND LIGI-ITING COM PANY J 7w/Ed*O afges SHOREHAM NUCLEAR POWER STATION P.O. BOX 618, NORTH COUNTRY RO AD e WADING RIVER, N.Y.11792 October 30, 1979 SNRC-443 Mr. Boyce Grier, Director Office of Inspection & Enforcement Region 1 U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 IE Bulletin 79-14 Shoreham Nuclear Power Station - Unit 1 W.O. 44430/48923 IE Bulletin 79-14 identified two issues requiring a response; the first issue involved, "The algebraic summation of loads in some seismic analyses," and the second issue involved, "The accuracy cu the input data need for the seismic stress analysis."

Issue one, "The algebraic summation of loads in some seismic analyses," was addressed in IE Bulletin 79-07, and Long Island Lighting Company's letter No. SNRC-397, dated June 6, 1979, responded to this issue.

Issue two requires demonstration that the seismic analysis performed on safety-related piping 2 " diameter and greater, and all seismic Category I piping regardless of size that was dynamically analyzed by computer, accurately reflects the actual installation. The original stress analysis, developed during the engineering and design phase of the project was generated from the piping geometry shown on the piping drawings, and the pipe supports were located and designed based on this stress analysis. Tolerances for the location of the pipe sup-ports are shown on the pipe support drawings, and the base-plates required for the installation of the support are included as part of the pipe support drawing. The piping drawing, the piping design specification and the vendor drawings of equip-ment mounted in the system, provided the stress analyst with the input data required for the original analysis.

1553 139 f romgo.+51 s

October 30, 1979 Mr. Boyce Grier Page 2 The fabrication and installation is accomplished from isometric drawings, generated by the pipe fabricator from the piping draw- '

ing in accordance with the specification. The installation is controlled by the relevant " Quality Assurance Procedures" (QAP) and requires all deviations from the designed geometric configu-ration of one inch or greater, to be documented on either a "Nonconformance and Disposition Report" (N&D) or, if the de-viation was requested prior to installation to be documented on an " Engineering and Design Coordination Report" (E&DCR) . Prior to responding to the E&DCR or N&D, the effects of the deviation on the stress analysis is evaluated. Both the E&DCR and the N&D are controlled documents that are indexed to the affected document.

On completion of the installation, the system is inspected ac-cording to the pertinent QAP, using the system flow diagrams and piping isometric drawings to ensure that the system had been installed to the latest information, and that it conforms to the engineering specification.

When the inspection has been completed, and all N&D's resolved, an "as-built" piping isometric is developed to accurately re-flect the actual geometry of the piping, the actual location of the pipe support and the actual orientation of the valve opera-tors or handwheels. The "as-built" isometric drawings are re-viewed by Engineering (stress analyst) and any variation be-tween the approved configuration and the as-built conditions is resolved. If the resolution of the stress analysis affects the pipe supports, this also will be resolved. Any changes required are issued to Construction. The updated isometric drawing, re-flecting the engineer's approval is then issued to Field Quality Control for their verification that the installed system is as shown on the approved "as-built" isometric drawing.

We trust that the above has been responsive to your request.

Should you desire any additional information, please do not hesitate to contact us.

Very truly yours, cc: Mr. Victor Stello, Director p ,- -, Office of I&E I ') U.S. Nuclear Regulatory Comm.

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t,) n /) !.7 ~1 % c Washington, D.C. 20555

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/ /J . P. Ndvarro

Project' Manager Shoreham Nuclear Power Station 1553 140 CKS:jm cc: J. Higgins, NRC Site