ML19224D653
| ML19224D653 | |
| Person / Time | |
|---|---|
| Site: | Bailly |
| Issue date: | 07/02/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Shorb E NORTHERN INDIANA PUBLIC SERVICE CO. |
| References | |
| NUDOCS 7907130279 | |
| Download: ML19224D653 (1) | |
Text
UNITE D STATES
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'n NUCLEAR REGULATORY COMMISSION ull 3' 5.$j$6/e i
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coeu r ttys. itur40;s sour JUL 2 1979 Docket No. 50-367 Northern Irdiana Public Service Cocipany ATTN:
Mr. Eugene M. Shorb Senior Vice President 5265 Hohman Avenue Hammond, IN 46325 Gentlemen:
The enclosed IE Bulletin No. 79-14 is forwarded to you for action.
Written responses are required.
If you desire additional information regarding this matter, please contact tnis office.
Sincerely, James G. k [aki=
Kepp er Director
Enclosure:
cc w/ encl:
Central File; Direttor, NRE/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Mr. Dean Hansell, Office of Assistant Attorney General 444 315 7907 3 0;L7 f,
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U.S. NUCLEAR REGULATORY COMMISSION 6
0FFICE OF INSPECTION AND ENFORCEMENT REGION III July 2, 1979 IE Bulletin No. 79-14 SEISMIC ANALYSES FOR AS-BUILT SAFETY-RELATED PIPING SYSTEMS Description of Circumstances:
Recenty two issues were identified which can cause seismic analysis of safety-related piping systems to yield nonconse3vative results.
One issue involved algebraic summation of loads in some reismic analyses. This was addressed in show cause orders for Beaver Valley, Fitzpatrick, Maine Yankee and Surry.
It was also addressed in IE Bulletin 79-07 which was sont to all power reacter licensees.
The other issue involves the accuracy of the information input for seismic analyses.
In this regard, several potentially unconservative factors were discovered and subsequently addressed in IE Bulletin 79-02 (pipe supports) and 79-04 (valve weights). During resolution of these concerns, inspection by IE and by licensees of the as-built configuration of several piping systems revealed a number of nonconformances to design documents which could potentially affect the validity of seismic analyses. Nonconformances are identified in Appendix A to this bulletin.
Because apparently significant non-conformances to design documents have occurred in a nunber of plants, this issue is generic.
The staff has determined, where design specifications and drawings are used to chain input information for seismic analysis of safety-related piping systems, that it is essential for these documents to reflect as-built con-figurations. Where subsequent use, damage or modifications affect the con-dition or configuration of safety-related piping systems as described in documents from which seismic analysis input information was obtained, the licensea must consider the need to re-evaluate the seismic analyses to con-sider the as-built configuration.
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