ML20141K456

Summary of 851206 Audit at Plant Re S&W Piping & Pipe Support Requalification Program.List of Attendees Encl

ML20141K456
Person / Time
Site:	Comanche Peak
Issue date:	12/17/1985
From:	Terao D NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
To:	Shao L NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
References
NUDOCS 8601220532
Download: ML20141K456 (5)

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p W Docket Nos.: 50-445/50-446 MEMORANDUM FOR: Larry C. Shao, Group Leader, C/P FROM: David Terao, Mechanical Engineer, C/P

SUBJECT:

AUDIT SUM ERY OF SWEC PIPING AND PIPE SUPPORT REQUALIFICATION l

On December 6,1985, the NRC staff and its consultants audited the status of '

the Comanche Peak piping and pipe support requalification effort currently being performed by Stone & Webster Engineering Corporation (SWEC). The staff discussed the following items with SWEC

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1. CPPP-8 Field Walkdown Results

2. Small Bore Piping Status Update t - 3. Piping and Pipe Support Reevaluation Status

4. Technical Issues Update

5. SWEC Scope vs. CPRT Program Plan A brief sumary of the details of the above listed items are discussed in the following paragraphs. A list of the meeting attendees are included in Attachment 1 to this memorandum.

1. CPPP-8 Field Walkdown Results SWEC described the approach used for their field walkdown program as presented in Project Procedure CPPP-7, " Piping Walkdown Procedure," i

, Revision 0, dated October 28, 1985. The purpose of the procedure was to 3 establish a program for field walkdown of selected large bore piping i i stress problems by experienced pipe stress and pipe support engineers in~

i order to review physical relationships between piping and pipe supports and critical configurations which may impact the conclusions regarding overall piping system design and acceptance.

SWEC discussed the background, selection of stress packages and engineers, their required training and indoctrination, and the preliminary walkdown observations. SWEC is planning to return to the site for a verification of certain observations whose deviations might have been attributed to  !

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changes cr modifications being implemented at that time. Tha final SWEC report is scheduled to be issued in February 1986. Following the SWEC i presentation, the staff discussed its coments and SWEC clarified questions raised by the staff which resulted from our review of the SWEC observations. The staff did not identify any deviations in the SWEC i walkdown as a result of our review. '

Small Bore Piping Status 2.

SWEC discussed its plans for the requalification of small bore piping and supports. The procedure for the small bore piping requalification is currently under development. The procedure will be Project Procedure CPPP-15 for Unit 1. The staff will review the small bore procedure when it is available and report our findings in a supplement report.

Currently, SWEC is planning to perfom an as-built walkdown for small bore piping in mid-January 1986 similar to the as-built walkdown performed by SWEC under Project Procedure CPPP-5 for large bore piping. ,

3 The staff raised a question of whether the attributes evaluated for the small bore piping walkdown should be different than those evaluated for large bore piping. The staff will discuss this item further wig s.CC l during our review of the small bore piping as-built walkdown.

3. Piping and Pipe Support Requalification Status

Under Unit 1, a total of 316 ASME Class 2 and 3 as-built piping stress j packages will be reanalyzed by SWEC. As of November 15, 1985, a total of 220 packages have been received by SWEC and assigned to the various offices. The percentage assigned to each SWEC office has been divided as i follows

Percent Assigned Responsible SWEC Office 50% New York, NY 25% Houston, TX 8% Cherry Hill, NJ 8% Boston,~MA 8% Toronto, CA A total of approximately 200 SWEC engineers are involved with the piping stress reanalyses and pipe support requalification effort (approximately 100 pipe stress engineers and 100 pipe support engiseers).

i For piping stress analyses, 109 stress packages are in progress.

Seventy-three stress packages (in addition to the 109 in progress) have been completed pending confirmation of certain data.

For pipe support requalification, 354 pipe support designs are in i

' progress. In addition, 295 supports have been completed. The mejority of the pipe support effort has been completed in New York and Toronto. The i

Cherry Hill and Boston offices are currently being staffed to provide further manpower in the pipe support effort.

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The modifications to pipe supp::rt hardware to date have beIn primarily for snubbsr reduction (47 snubbers eliminated) and additional anchorages i (added to small bore piping systems to eliminate use of overlap technique inanalysis).

The SWEC Project Procedures CPPP-6 and s?PP-7 which cover the piping and -

pipe support requalification effort have been completed by SWEC.

However, their fomal issuance by TUGC0 has been delayed pending a detemination of proper distribution to parties involved in the CPSES hearings.

4. Technical Issues Update The staff reviewed a draft copy of a SWEC document entitled, " Evaluation  ;

of Generic Technical Issues," dated November 5,1985. This document ,

provides the resolution of many external source issues (i.e., Walsh-Doyle, ASLB, Cygna, and NRC staff concerns) and is planned to be issued as a formal project document. However, only about one-third of the technical issues listed have been completed. The other issues are in various stages of completion. The issues which are nGtsd as 100% complete are the following:

1. Friction Forces 6. Mass Point Spacing

2. A500 Grade B Tube Steel 7. High Frequency Mass Participation

3. OBE/SSE Damping 8. Fluid Transients

4. Support Mass in Piping Analysis 9. Safety Factors

5. Interative Design 10. A36 ana A307 Steel The staff plans to engage in a series of audits with the applicant and SWEC (and possibly the CPRT) to discuss the resolution of the special technical issues in January 1986.

5. SWEC Scope vs. CPRT Program Plan The CPRT Program Plan in DSAP IX Attachment 2 describes the major activities associated with the SWEC piping and pipe support requalification effort. The staff discussed with SWEC the procedures which control each of those six major activities. . The SWEC task and the applicable procedure are as follows:

1. Development of Comanche Peak Pipe Stress and Pipe Support Design Criteria (CPPP-7).

2. Verification of As-Built Information (CPPP-5) .

3. Review and Verification of System Design Input, Seismic Acceleration, and Fluid Transients (CPPP-10).

, 4. Varification of Existing Pipe Support Design Documents (This task has '

been changed and is part of Task 6.).

, 5. Resolution of Special Technical Concerns (" Evaluation of Generic

TechnicalIssues").

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6. Reanalysis of Piping Systems and Reevaluation of Pipe Support Designs  !

(CPPP-6).

A total of 20 inspection-hours were involved with this audit.

David Terao, Mechanical Engineer Comanche Peak Project i

cc: V. Noonan T. Westerman C. Tranne11 J. Calvo A. Vietti-Cook S. Hou G. Mizuno J. Fair P. Chen, ETEC D. Landers, TES R. Hookway, TES i

, DEC 17 ATTACitlENT 1 NAME COMPANY John Finneran TUGC0 David Terao NRC W. P. Chen ETEC Roger Stuart Teledyne Bob Hookway Teledyne Rick Nonnandeau S&W Alan Chan S&W Ron Klause S&W Peter Dunlop S&W K. Y. Chu- SWEC Don Hernon SWEC-Ron Wrucke SWEC l

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