ML20140J031

Summarizes Site Audit of as-built Piping Penetrations.Audit Conducted to Gain Understanding of Adequacy of Piping Penetration as-built Data Used by S&W for Piping Reanalysis Effort

ML20140J031
Person / Time
Site:	Comanche Peak
Issue date:	03/25/1986
From:	Terao D NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
To:	Shao L NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
Shared Package
ML20140J036	List: ML20140J031 ML20140J060
References
NUDOCS 8604040248
Download: ML20140J031 (3)

Text

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[ ;E p, NUCLEAR REGULATORY COMMISSION W ASHINGTON, D. C. 20555 h/k@g  !

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% ..,** WAR 2 51glg Docket Nos.: 50-445/50-446 MEMORANDUM FOR: Larry C. Shao, Manager, Comanche Peak Task Force FROM: David Terao, Piping & Supports Leader, Comanche Peak Task Force

SUMMARY

OF SITE AUDIT ON AS-BUILT PIPING PENETRATIONS On March 11-12, 1986, the NRC staff and its consultants from Teledyne Engineering Services (TES) conducted an audit at the Comanche Peak site. The purpose of the audit was to gain an understanding of the adequacy of the piping penetration as-built data used by Stone & Webster Engineering Corporation (SWEC) for their piping reanalysis effort. Previously, the staff audited the SWEC piping reanalysis for a portion of the residual heat removal (RHR) system at the SWEC New York office and identified several items related to the piping penetration data used by SWEC for the piping analytical model. Consequently, the staff detennined a need to review (1) how the penetration data was developed, (2) the completeness of the penetration data for use in piping analysis, and (3) the accuracy of the penetration data. A list of personnel contacted during the site audit is included in Attachment 1 to this memorandum.

The staff discussed with the applicant, the process used to establish the data in the penetration seal schedule (PSS). The staff found that Southwest Research Institute (SWRI) had been contracted by the applicant for establishing the penetration program. SWRI reviewed all physical plant drawings to locate penetrations through floors, walls, and slabs. All penetrations including piping, HVAC, electrical (Cable tray and conduit), instrument / tubing, tornado vent, plumbing lines, and seismic gaps were identified. SWRI perfomed a plant walkdown of penetrations to verify the penetration data. The data was compiled in a penetration seal schedule (PSS) which provides a computerized listing of the penetrations and associated data. The PSS are available in various fomats depending on their use. The staff reviewed the listing for the mechanical (piping) penetrations (PEN-DESC) which is sorted by pipe line number. The staff noted that ungrouted piping penetrations are not required to l be listed in the PSS. Accordingly, the PSS may or may not list ap ungrouted piping penetration. A copy of the guideline for interpreting the computer data reports was provided to the staff and is included in Attachment 2 to this mcmorandum.

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. W.AR 2 5'1986 A concern was raised regarding the QA document control associated with the PSS reports. The staff will continue its review of this item as part of its overall review of the adequacy of the as-built piping verification activities.

The staff reviewed the completeness of the as-built penetration data used by SWEC for proper modelling of the piping. The as-built information provided by TUGC0 to SWEC includes by (1) the penetration seal schedule (PEN-DESC), (2) sleeve take-off sheets, (3) pip.ing isometric drawings (BRPs), and (4) penetration detail drawings for developing the piping analytical model. The PSS report provides the penetration identification number, location, type, size, sealant required, temperature, and other pertinent information about the penetration. The sleeve take-off sheets shows the as-built clearances between the outside pipe wall and the penetration sleeve. The piping isometric (BRP) drawings show the piping penetrations for all safety-related piping systems.

The penetration detail drawings provide the physical details of typical penetration sleeves and sealing arrangements. In addition, the staff reviewed a copy of SWEC Project Memorandum No. 14 dated January 8, 1986 which provides to the piping analysts the stiffnesses to be used for modelling the sealant materials in the pipe sleeves.

For a sample verification walkdown, the staff selected several piping stress problems at random and included stress problem 1-0428 from the residual heat removal system. The staff had previously audited the piping analysis results for stress problem 1-042B at the SWEC New York office and the walkdown of this stress problem was considered a continuation of that effort. The purpose of the staff walkdown was to verify the accuracy of the as-built penetration data used by SWEC. The staff focused on the accuracy of the penetration data provided in the penetration seal schedule and in the piping isometric (BRP) ,

drawings compared to the actual installed condition. The results of the staff walkdown will be documented in an audit report currently being prepared by TES.

A total of 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> were involved in this audit.

t David Terao Comanche Peak Task Force cc: V. Noonan T. Westennan C. Trammel A. Vietti-Cook G. Mizuno S. Hou D. Landers, TES R. Hookway, TES R. Stuart, TES

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YAR 2 [ 1;aS Attachment 1 Attendance List March 11-12, 1986 CPSES Site Audit (Penetrations)

Name Company John Burgess TUGC0 John Oliver SWEC Kim Anger TUGC0 Roger Stuart TES Steve Superson .TES David Terao NRC i

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