ML19207B544
| ML19207B544 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 08/15/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7908300225 | |
| Download: ML19207B544 (1) | |
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UNITED STATES e
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,,,4 P'ALNUT CR E E K, CALIFORNIA 94596 August 15, 1979 Docket No. 50-133 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94105 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
The enclosed supplement to Bulletin 79-14 is forwarded to you to provide added guidance on the intent of the Bulletin.
If you desire additional information regarding this matter, please contact this office.
Sincerely, mf[L R. H. Engelken Director
Enclosure:
Supplement IE Bulletin No. 79-14 cc w/ enclosure:
W. Barr, PG&E W. Raymond, PG&E E. Weeks, PG&E, Humboldt Bay 852 320-79083 009 df
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6820 Accession No:
7908080360 UNITED STATES NUCLEAR REGULATORY CCHilSSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 August 15, 1979 Suoplement IE Bulletin Mo. 79-14 SEISMIC ANALYSIS FOR AS-BUILT SAFETY-RELATED PIPING SYSTEMS Discriptior, of Circumstances:
IE Eulle-in No. 79-14 was issued on July 2,1979 and revised on July 18, 1979.
The bulletin requested licensees to take certain actions to verify tht seismic analyses are applicable to as-built plants." This supplement to the bulletin provides additional guidance and definition of Action Items 2, 3, and 4.
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To comply with the requests in IE Bulletin-79-14, it will be necessvy for licensees to do the following:
2.
Inspect Part of the Accessible Piping For each system selected by the licensee in accordance with Item 2 of the Bulletin, the licensee is exoected to verify by physical inspection, to the extent practicable, that the inspection elements meet the acceptance criteria.
In perfoming these inspectons, the licensee is expected to use measuring techniques of sufficient accuracy to demonstrate that acceptance criteria are met.
Where inspection elements important to the seismic analysis cannot be viewed because of thermal insulation or location of the piping, the licensee is expected to remove themal insulation or provide access.
Where physical inspection is not practicable, e.g., for valve weights and materials of construction, the license is expected to verify confomance by inspection of quality assurance records.
If a nonconfomance is found, the licensee is expscted in accordance with Item 4 of the Bulletin to cerfom an evaluation of the significance of the nonconfomance as rapidly as possible to detemine whether or not the operability of the system might be jeopardized during a safe shutdown earthquake as defined in the Regulations.
This evaluation is expected to be done in two phases involving an initial engineering judgement (within 2 days), followed by an analytical engineering evaluation (within 30 days). Where either phase of the evaluation shows that system operability is in jeopardy, the licensee is expected to meet the applicable technical specification action statement and complete the inspections required by Item 2 and 3 of the Bulletin as soon as possible.
The licensee must report the results of these inspections in accordance with the require-ments for content and schedule as given in Item 2 and 3 of the Bulletin.
3.
Inspect Remaining Piping The licensee is expected to inspect, as in Item 2 above, the remaining safety-related piping systems which were seismically analyzed and to report the results in accordance with the requirements for content and schedule as given in Item 3 of the Bulletin.
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Sucolement IE Bulletin No. 79-14 Page 2 of 2 August 15, 1979 4A.
Evaluate Moncomformances With regard to Item 3A for the Bt11etin, the licensee is expected to include in the initial engineering judgement his justification for continued reactor operation.
For aha analytical engineering evaluation, the licensee is expected to perform vhe evaluation by using the same analytical technique used in the seignic analysis or by an alternate, less cerclex technicue prcvided that the ligensee can shew that it is conservative.
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If either part of the evaluation show('that the system may not perform its intended function during a desic. basis earthquake, the licer.see must promptly comply with applicable action statements and reporting requirements in the Technical Specifications.
- 48. Submit Monconformance Evaluations The licensee is expected to submit evaluations of all nonconformances and, where the licensee concludes that the seismic analysis may not be conservative, submit schedules for reanalysis in accordance with Item 4B of the Bulletin or correct the noncomformances.
4C. Correct Nonconformances If the licensee elects to correct nonconformances, the licensee is expected to submit schedules and work descriptions in accordance with Item 4C of the Bulletin.
40.
Improve Oualtiy Assurance If noncomformance; are identified, the licensee is expected to evaluate and improve quality assurance procedures to assure that future modifica-tions are handled efficiently.
In accordance with Item 40 of the Bulletin, the licensee is expected to revise design documents and seismic analyses in a timely manner.
The schedule for the action and reporting requirement.s given in the Bu'ietin as originally issued remains unchanged.
Approved by GAO, B180225 (R0072); cleararce expires 7-31-80.
Approval was given under a blanket clearance specifically for ideritified generic problems.
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