ML19208B923
| ML19208B923 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 09/07/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7909240161 | |
| Download: ML19208B923 (1) | |
Text
- 'd UNITED STATES E'*
j NUCLEAR REGULATORY COMMISSION 3
.C REGION V j g S
19'JO N. CALIFORNI A BOULEVARD
,e SUITE 202, WALNUT CREEK PLAZA
- ee,*
WALNUT CREEK, CALIFORNIA 945'J6 September 7,1979 Docket tio. 50-133 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: fir. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
The enclosed Supplement 2 to Bulletin fio. 79-14 is forwarded to you to provide added guidance on the intent of the Bulletin.
If you desire additional information regarding this natter, please contact this office.
Sincerely,
/W2,$dk R. H. Engelken Director
Enclosures:
1.
Supplement 2 to IE Bulletin flo. 79-14 2.
List of IE Bulletins Issued in Last Six lionths cc w/ enclosures:
W. Barr, PG&E W. Raymond, PG&E E. Weeks, PG&E, Humboldt Bay 383274
/
790924016\\
4 SSIfiS:
6820 Accesstion flo.: 7908220109 UNITED STATES fiUCLEAR REGULATORY COMMISS10tl CFFICE OF IflSPECTI0f1 Afl0 EttFORCEf4EflT WASHIf1GT0ft, D.C.
20555 September 7, 1979 IE Bulletin flo. 79-14 Supplement 2 3EI'"'IC P ALYSIS FOR AS-E' JILT SAFETY-RELATED PIPING SYSTEMS Description of Circumstances:
IE Bulletin flo. 79-14 was issued on July 2, revised on July 18, and first supplenented on August 15, 1979.
The bulletin requested licensees to take certain actions to verify that seisnic analyses are applicable to as-built plants. Supplement 2 provides the following additional guidance with regard to inplementation of the bulletin requirements:
flonconformances One way of satisfying the requirements of the bulletin is to inspect safety-related piping systems against the specific revisions of drawings which were used as input to the seismic analysis.
Some architect-engineers (A-E) however, are recortmending that their customers inspect these systems against the latest revisions of the drawings and mark then as necessary to define the as-built configuration of the systems. These drawings are then returned to the AE's offices for comparison by the analyst to the seismic analysis input.
For licensees taking this approach, the seismic analyst will be the person who will identify nonconformances.
The first supplement to the bulletin provided guidance with regard to evaluation of nonconformances. That guidance is appropriate for licensees inspecting against later drawings.
The licensee should assure that he is promptly notified when the AE identifies a nonconformance, that the initial engineering judgment is completed in two days and that the analytical engineering evaluation is completed in 30 days.
If either the engineering judgement or the analytical engineering evaluation indicates that system operability is in jeopardy, the licensee is expected to meet the applicable technical specification action statement.
Visual Approximations Some licensees are visually estimating elements, and have not documented whic DUPLICATE DOCUMENT
.g Visual estimation of dimensions is not where visual estimates are used, the a yntiredocumentpreviouslyentered ance requirements.
Further, in docume 'nto system under:
ically identify those data that were v 33g 79gg gjg7 No. of pages:
[
_ -.._ _ _.. _.