ML20199L260
| ML20199L260 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/07/1986 |
| From: | Terao D NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM) |
| To: | Shao L NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM) |
| References | |
| NUDOCS 8604100328 | |
| Download: ML20199L260 (4) | |
Text
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NUCLEAR REGULATORY COMMISSION 8\\ 3 E
M nE WASHINGTON, D. C. 20555 g/
s,......i MAR 7 1986 4
f Docket Nos: 50-44:./50-446 MEMORANDUM FOR: Larry C. Shao, Manager, Comanche Peak Task Force FROM:
David Terao, Piping & Supports Leader, Comanche Peak Task Force
SUBJECT:
AUDIT
SUMMARY
OF SWEC PIPING / SUPPORTS STATUS On February 24, 1986, the NRC staff and its consultants from Teledyne Engineering Services (TES) conducted an audit of the status of the CPSES piping and pipe support requalification effort currently being perfomed by Stone &
Webster Engineering Corporation (SWEC). The audit was held at the SWEC offices in New York, NY. The following paragraphs summarize the M ghlights of the items discussed during the audit. A list of attendees at the audit are included in Attachment 1 to this memorandum.
1.
Large Bore Piping / Supports Status From a total of 317 large bore pipe stress package: to be reanalyzed by SWEC, they have received 314 as-built piping packages from the site. As of the end of January 1986, SWEC was approximately 50 percent complete with the pipe stress reanalysis. SWEC had completed 153 pipe stress packages (subject to confirmation of data). The projected completion date for the piping reanalysis effort is the end of April 1986.
For the pipe support requalification effort, SWEC is approximately 50%
complete. From a total of approximately 4000 large bore pipe supports for which new support loads have been calculated from the piping reanalysis, SWEC has completed 1250 support calculations (pending confinnation *vhere required). There are currently 1000 pipe supports in progress with another 1700 supports in backlog. The projected completion date for the i
pipe support requalification effort is the end of June 1986.
2.
CPPP-8 Update The engineering walkdown performed by SWEC under Project Procedure CPPP-8 identified 440 observations. The observations were grouped and classified into 105 categories. A SWEC evaluation of 172 observations to date have resulted in a disposition of an observations as either (1) no action required, (2) TUGC0 action / review, or (3) SWEC programmatic action.
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_2-Currently, SWEC is in the process of evaluation 268 of the 440 observations. Although it is difficult for SWEC to establish a~ completion date for the CPPP-8 report, SWEC plans to have a draft report of the CPPP-8 results available for staff review by the end of March 1986. The staff discussed its plans to audit the observations identified by the walkdown in the near future in order to determine the need for sample l
expansion. SWEC stated that the sample population inspected in the CPPP-8 walkdown included cver 2500 pipe supports from 70 pipe stress problems and that they believed the types of as-built concerns identified in the walkdown are comprehensive and all-inclusive.
3.
Load Combinations and Acceptance Criteria l
The staff raised a concern regarding the load combinations and stress acceptance criteria used by SWEC for piping and pipe support design.
l Currently, the load combinations and acceptance criteria presented in Section 3.9B.3 of the CPSES FSAR do not agree with the load combinations and acceptance criteria presented in Project Procedure CPPP-7.
In addition, the method of load combination used by SWEC (i.e., SRSS) is not consistent with the method of load combination stated in the FSAR (i.e.,
l absolute sum except for LOCA and SSE for which the SRSS method is used.
l The applicant stated that the FSAR will be revised to reflect the criteria used by SWEC. Currently, the FSAR reflects the design criteria previously l
used by Gibbs & Hill. The staff also noted that the functional capability l
criteria for piping which the staff evaluated in the SER based on Gibbs &
Hill's analysis needs to be addressed by SWEC in the FSAR revision to l
assure that the FSAR comitments have been satisfied.
The staff further raised questions regarding the pipe support allowables i
presented in CPPP-7. The applicant committed to rereview Tables 3.5-7, 3.5-2 and 4.7.2-1 through 4.7.2-7 in CPPP-7 on load combinations and the stress acceptance criteria for piping and pipe supports. This item remained unresolved and will be discussed further at the next sti.ff audit.
4.
S)ecial Technical Issues Tle staff discussed the topics to be addressed at the next special technical issues meeting to be held at the SWEC offices in Cherry Hill, NJ, during March 18-20, 1986. The topics to be discussed will include the l
resolutions to the following technical issues:
1.
Pipe Support Generic Stiffness 2.
Valve Modelling/ Qualification 3.
Safety Factors 4.
U-Bolt Twisting 5.
Gaps 6.
SSER-8 Review 7.
SSER-10 Review 8.
SSER-11 Review 9.
Seismic Acceleration of Pipe Support Mass l
- 10. Local Stresses in Piping l
- 11. Welding
- 12. Richmond Inserts
- 13. A36 and A307
- 14. Anchor Bolts l
L
MAR 7 1966 15. Strut Angularity
- 16. Component Qualification
- 17. Lccal Stress in Pipe Suppcrt P! embers
- 18. Wall-to-Wall / Floor-to-Ceiling Restraints
- 19. U-Bolt Cinching
- 20. Axial / Rotational Restraints e
A total of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> were involved with this audit. The next status audit was tentatively scheduled for March 31. 1986.
g David Terao Comanche Peak Task Force cc:
V. Noonan T. Westennan C. Trannell A. Vietti-Cock G. Mizuno S. Hou D. Landers,TES R. Hookway, TES P. Chen, ETEC i
P m
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. Attachment I NRC Audit of_the Status of SWEC Pipitig/ Supports Recualification February 24. 1986 Name Affiliation D. Terao NRC R. Hookway TES/NRC J. Finneran TUGC0
_ D. A. Van Duyne SWEC R. Normandeau SWEC R.-Wrucke SWEC i
C. Watters SWEC R. Klause SWEC D. Hernon SWEC 4
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