ML18081A757
| ML18081A757 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 10/30/1979 |
| From: | Schneider F Public Service Enterprise Group |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-14, NUDOCS 7912170190 | |
| Download: ML18081A757 (4) | |
Text
Frederick W. Schneider Vice President Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201 /430-7373 Production October 30, 1979 Mr. Boyce H. Grier, Director U.S. Nuclear Regulatory Conunission Off ice of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. Grier:
NRC IE BULLETIN NO. 79-14, SUPPLEMENT 2 NO. 1 UNIT SALEM GENERATING STATION In response to your letter of S.eptember 7, 1979, transmitting NRC I&E Bulletin 79-14, Supplement 2, which was received on September 10, 1979, the attached report sununarizing the results of the stress walk conducted, is hereby submitted for your review.
If you require additional information, we will be pleased to discuss it with you.
Very truly yours, Attach.
CC:
Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D.C.
Office of Nuclear Reactor Regulation Division of Operating Reactors Washington, D.C.
Mr. L. J. Norrholm Hancocks Bridge, N.J.
I/VP:
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REFER.fil1CES:
NRC BULLETIN I&E 79-14, dated July 2, 1979 Rev. 1, dated July 18, L979 Supplement 1, -dated August 15, 1979 Supplement 2, dated September 7, 1979 SEISMIC ANALYSIS OF "AS BUILT" SAFETY RELATED PIPING SYSTEMS SALEM NO. 1 UNIT The following is a supplemental response on the subject Bulletin.
The stress walk on those safety related piping systems identified on Attachment C of our letter dated August 16, 1979, has been completed.
A total of 885 piping lines were involved, of which 875 lines were walked.
Th balance of 10 piping lines were in areas which were inaccessible and, therefore, were not inspected.
NRC Bulletin 79-14, Supplement 2, dated September 7, 1979 provided additional information with regard to the implementation of Bulletin requirements.
Listed below is the guideline that was followed when implementing the specific Bulletin requirements.
NON-CONFORMANCES The Engineering bepartment has determined the acceptability of the calculations that contained "as built" conditions.
If the "as built" condition necessitated recalculating the piping in question, this was done and necessary modifications were im-plemented in the field.
No non-conformances have been. found, however, 125 discrepancies have been identified as a result of the field walk.
The majority of the items that have been identified as dis-crepancies include loose bolts on hanger supports, bent pipe support rods, removal of temporary supports that are not in-tended to function as hangers, cleaning of* debris on sliding supports.
These discrepancies apply to all systems as listed on Attachment C.
Detailed description of work required to establish acceptability, including documentation, will be on file at our Newark and Site offices.
The discrepancies that were not modified had stress calculations rerun taking into con-sideration those discrepancies and the results were found to be within approved acceptance criteria.
In addition, we had identi-fied three pipe hangers which were reported as failed Seismic I pipe supports, as they were found with a broken U-Bolt, a cracked weld, and a damaged pipe guide.
The hangers were in the Safety Injection and Chemical Volume Control Systems.
These items have since been repaired and accepted.
NRC Bulletin 79-14 VISUAL APPROXIMATIONS During the field walk, specific dimensions were checked and visual approximations were made by comparison with existing physical items of known dimensions since verification in those areas was not practical.
However, every care has been taken to ensure that pertinent data was accounted for to enable our Engineering Depart-ment to determine the validity of the seismic analyses.
INSULATION In areas where thermal insulation interferes with the inspec.tion of pipe supports,.attachment welds, saddles and support con-figurations, it was partially removed to verify supports within the required degree of accuracy.
However, there are areas where loose insulation and damaged insulation have been found.
These areas were documented and the Station Maintenance Department will correct the discrepancies.
Stress Engineering has reviewed the impact of this kind of discrepancy on seismic acceptability and found no adverse effects on system operability.
CLEARANCES
- Attachments and penetrations have been checked for proper clearance to ensure allowance for thermal growth of the piping during plant operation.
No discrepancies were observed.
LOOSE BOLTS Loose bolts were identified and corrected as any other discrepancy.
VALVE WEIGHT While investigating the correct weights of the valves, the quality assurance records were checked and found to be in accordance with the seismic analysis.
DIFFICULT ACCESS More than 98%*of all safety related piping and supports have been inspected.
All of the piping in~ide the pressure boundary has been inspected.
Two Auxiliary Feedwater lines are buried under-
- ground.
The 2% balance not inspected is in high radiation areas in the Auxiliary Building and in physically inaccessible areas.
Since no non-conformances exist in the piping inspected (98%),
we are therefore confident the remaining 2% is acceptable.
.L
NRC Bulletin 79-14 CONCLUSIONS Based on the completed field walk, PSE&G concludes that the "as built" piping systems conform to the stress isometrics which had been used for performing the seismic analyses.
Consequently, Salem Unit #1 has no known adverse conditions affedting systems operability and, therefore, remains to be a safe plant.
RCK:rl