ML20141K484

Trip Rept of 851025 Audit at S&W Ofcs in New York,Ny Re Piping & Pipe Support Effort.List of Attendees Encl

ML20141K484
Person / Time
Site:	Comanche Peak
Issue date:	11/22/1985
From:	Shao L NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
To:	Noonan V NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
References
NUDOCS 8601220543
Download: ML20141K484 (5)

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/ NOV g g y MEMORAN0l#1 FOR: Vjncent S. Noonan, Director, Comanche Peak Project FROM: Larry C. Shao, Manager, Engineering Group .

Comanche Peak Project

SUBJECT:

TRIP REPORT

SUMMARY

FOR AUDIT OF SWEC PIPING AND PIPE SUPPORT EFFORT On October 25, 1985, the staff and its consultants from Teledyne Engineering Services (TES) perfomed an audit at the Stone & Webster Engineering Corporation (SWEC) offices in New York, NY. The purpose of the audit was: (1) pro toreviewthestatusofthepipingandpipesupportdesignadequacy(3)

(2) to review the SWEC CPPP-8 Engineering Walkdown Procedure, and gram, to discuss the small bore piping requalification effort. A list of the meeting attendees is attached to this memorandum.

Status of Piping and Pipe Support Effort For Unit 1, a total of approximately 300 large bore piping stress problems will be reanalyzed by SWEC. The SWEC procedures covering the piping and support effort is CPPP-6 and CPPP-7. At this time, both procedures are in draft fom and planned to be issued fomally on November 1,1985.

The SWEC piping stress analysis will use the refined building amplified response spectra (ARS) previously developed by Gibbs & Hill. SWEC discussed the possibility of using the damping values pemitted in Code Case N-411 for problems where snubber reduction is desired. If these damping values are used, new ARS would have to be generated. The N-411 ARS would be generated by Gibbs &

Hill.

9601220543 851122, .y PDR ADOCK O 5 1

NOV

. Vincent S. Noonan 22 m The staff discussed the transients to be evaluated in the SWEC large bore -

piping reanalysis. Nine piping systems were considered for transient loadings:

1. Safety injection

2. Containment spray

3. Chemical volume and control

4. Main steam

5. Feedwater

6. Steam generator blowdown / cleanup

7. Residual heat removal (RHR)

8. Service water

9. Auxiliary feedwater (AFW)

Fluid transients have been developed for systems 1 through 6, above. For service water, transients may be eliminated through system modifications (e.g.,

installingstandpipes). The AFW system is being evaluated b the need for dynamic transient loadings (e.g., water hammer)y .

SWEC SWEC to determine is also reviewing the RHR system for transient loadings. The staff will continue to monitor the transient loadings to be included in the piping stress analyses. In ,

addition, the staff plans to review a system subject to dynamic transients in detail from the design analysis to a system walkdown.

The staff discussed the status of the large bore piping and pipe support effort. Five offices of SWEC are currently staffed for the large bore piping and pipe support effort. Stress packages were transmitted to the five offices in mid-September 1985. To date, 184 out of 300 packages have been received by SWEC from TUGCO. One hundred fifty-one stress packages have been assigned to a SWEC office and is in process. Forty-eight stress packages are 90% complete.

The breakdown is as follows:

Number of Pipe Stress Packages Responsible SWEC Office 98 New York, NY 29 Houston, TX 12 Cherry Hill, NJ 8 Toronto, Canada 4 Boston, MA The pipe support requalification effort is being perfonned primarily in New York. From the 48 stress packages which are 90% complete,159 out of approximately 400 pipe supports are currently being evaluated. Eighty-four pipe supports are complete but need final confinnation.

In addition, SWEC has established a document control center in New York to interface between the site and the five SWEC offices. SWEC has also established a gang hanger group and an equipment nozzle allowable group in New York. Bi-weekly visits to the five offices are also conducted by SWEC to ensure consistency of work and a coordinated effort.

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2 Vincant S. Noonan  :

The staff discussed the schedule for issuance of SWEC procedures related to the piping and pipe support design activities. The scheduled dates for the

procedures to be issued are as follows

CPPP-6 designflowchart-Unit 1) -

November 1,1985(Rev.1)  !

CPPP-7 designguidelines) - November 1, 1985  ;

CPPP-8 engineering walkdown) -

October 29, 1985

~

CPPP-9 design flowchart - Unit 2) -

later .

CPPP-10 operatingmodes) - November 1, 1985 ,

i CPPP-15 (small bore piping design) -

later l Small Bore Piping and Supports SWEC discussed the tentative plans for the requalification of small bore piping. The procedure for the small bore piping requalification is currently under development. The procedure will be CPPP-15 for Unit 1. The staff will review the small bore procedure when it is available and report our findings in a supplemental report. -

Review of Draft Procedure CPPP-8 e

The staff reviewed a draft copy of SWEC procedure CPPP-8, " Piping and Support

) System Evaluation Walkdown Procedure." The procedure describes an engineering walkdown of a selected sample of large bore piping systems to identify

} potential interactions between piping and pipe supports. The procedure is scheduled to be issued on November 1, 1985. The walkdown is scheduled to begin on November 12, 1985. The staff is planning to audit the implementation and

, results of the walkdown during the week of November 18, 1985.

.s

~ Based on our review of the CPPP-8 procedure, the staff concludes that the procedure provides an adequate methodology for identifying the interactions S between piping and pipe supports which could potentially impact the validity of

) piping and pipe support design and analysis. The staff also finds the random sample of 50 stress packages plus an engineered sample of 20 stress packages provides a sufficient number of piping systems to adequately evaluate the likelihood for potential interactions between piping and pipe supports.

L. C. Shao, Manager >

Engineering Group Comanche Peak Project

Enclosure:

List of meeting attendees cc: See next page i

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Vincent S. Noonan gg 22 NGS cc w/ encl: D. Eisenhut, NRR C. Trammell, DL

< J. Calvo, TRT S. Burwell, DL -

1 A. Vietti, D' C. Early. DL' >

S. Hou. TRT G. Mizuno. ELD J. Fair, IE P. Chen, ETEC D. Landers, TES R. Hookway, TES

! D. Terao, TRT I

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NOV 22 Bes ENCLOSURE 1 LIST OF ATTENDEES FOR OCTOBER 25, 1985 MEETIhG ON AUDIT OF CPSES PIPING AND PIPE SUPPORT STATUS NAME AFFILIATION R. Klause SWEC C. Fonseca SWEC K. Y. Chu SWEC P. Dunlop SWEC R. Wrucke SWEC R. Stuart TES/NRC Consultant

R. Hookway TES/NRC Consultant D. Terao NRC .

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