ML20141M817

Summary of 860210 Audit W/Teledyne Engineering Svcs in Boston,Ma Re S&W Piping Dynamic Transient Analysis.List of Attendees Encl

ML20141M817
Person / Time
Site:	Comanche Peak
Issue date:	02/21/1986
From:	Terao D NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
To:	Shao L NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
References
NUDOCS 8602280282
Download: ML20141M817 (3)

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\.....* FEB 21 E Docket Nos. 50-445/50-446 MEMORANDUM FOR: Larry C. Shao, Group Leader, Comanche Peak Task Force FROM: David Terao, Piping & Supports Leader, Comanche Peak Task Force

SUBJECT:

AUDIT

SUMMARY

OF CPSES TRANSIENT ANALYSES On February 10, 1986, the NRC staff and its consultants from Teledyne Engineering Services (TES) conducted an audit of the piping dynamic transient analyses perfomed by Stone & Webster Engineering Corporation (SWEC) for Comanche Peak. The audit was held at SWEC offices in Boston, MA. The following paragraphs summarize the highlights of the topics discussed during the audit. A list of persons attending the audit are included in Attachment 1 to this memorandum.

1. Process for the Selection of Fluid Transients The staf f discussed with SWEC those piping systems at CPSES which are susceptible to the dynamic fluid transients. The fluid transient of concern are those which produce a sudden one-dimensional force along the pipe axis. SWEC has established a special fluid transient group which reviews the piping systems and pipe configurations and develops the time-history forcing functions used in the piping dynamic analyses.

The fluid transient group used NUREG-0582, " Water Hamer in Nuclear Power Plants" for guidance in detennining which systems are most susceptible to water hamer loadings. SWEC also reviewed the input from previous fluid transient analyses perfomed by Gibbs & Hill.

A general di;cussion regarding the susceptibility of steam-generator water hamer in the feedwater piping arose. The staff questioned whether CPSES had implemented Westinghouse generic recomendations for reducing the possibility of water hamer in Model 04 and D5 steam generators as a result of the CRSK0 event. In addition, it was unclear whether the licensing comitment to perform preoperational tests for water hamer had been implemented yet. The applicant stated it would review the staff's questions and address it at a later date.

2. Systems Subject to Fluid Transients 5WEC gave a detailed presentation describing for each piping system the nature and type of fluid transient which could occur in each system, the conditions causing the most limiting conditions, and the severity of the loadings. In those cases where system modifications could be implemented to eliminate or reduce the possibility for a fluid transient, the modifications or proposed resolutions were presented. Discussion also focused on the assumptions used to develop the forcing functions although it was noted by SWEC that the assumptions and methodology used were the same as those used in other SWEC designed nuclear /

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L. C. Shao c'. - g, , y The SWEC presentatiori covered the containment spray, service water,

! chemical and volume control system (CVCS), main steam, safety injection, residual heat removal, and feedwater systems.

It was noted that SWEC is not using the revised ASME Code Case N-411 l

damping values fur the time history analysis but rather is using the damping values given in Regulatory Guide 1.61.

Table 1, attached to this memorandum, provides a sumary of the fluid transients anticipated for CPSES for each piping system.

Schedule and Status of Completion The schedule for completion of the fluid transient analysis of each piping system is provided below.

Unit 1 Unit 2 Scheduled Scheduled Percent Completion Percent System Completion Complete Date Complete Date 02-21-86 50 CT 02-05-86 100 03-11-86 10 SI 02-24-86 80 03-14-86 20 SW 02-05-86 100 01-13-06 100 RH 10-29-85 100 03-21-86 15 CS 01-25-86 100 03-09-86 10 MS 02-24-86 90 02-17-86 60 FW 02-15-86 75 The staff discussed its plan to audit the' transient analysis for the residual heat removal (RH) system during the week of February 24, 1986, at the SWEC offices in New York, NY, as part of the piping system reanalysis audit.

No violations were A total of 30 staff hours was involved with this audit.

identified.

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David Terao Piping & Supports Leader Comanche Peak Task Force

Attachment:

As stated .

cc: V. Noonan T. Westerman C. Tramell A. Vietti-Cook S. Hou G. Mizuno D. Landers (TES) i i

R. Hookway (TES)

P. Chen (ETEC)

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