ML19225A290
| ML19225A290 | |
| Person / Time | |
|---|---|
| Site: | 05000363 |
| Issue date: | 07/02/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| References | |
| NUDOCS 7907180767 | |
| Download: ML19225A290 (1) | |
Text
- RICQ 7"A y[t4 I9, UNITED STATES
(,g NUCLEAR REGULATORY COMMISSION y*
,(
%? ' sj c. 8 REGION I I
S 631 PARK AVENUE
%,, ' b"
,o KING OF PRLISSIA, PENNSYLVANIA 19406 Docket No. 50-363 DUL 2 1979 Jersey Central Power & Light Company ATTN:
Mr. I. R. Finfrock, Jr.
Vice President 250 Cherry Hill Road Parsippany, New Jersey 07054 Gentlemen:
The enclosed Bulletin 79-14 is forwarded to you for action. Written responses are required.
If you desire additional information > -- iing this matter, please contact this office.
Sincerely, yG f
/
/
oyce n.
ri'er M irector
Enclosures:
1.
List of IE Bulletins Issued in Last 12 Months cc w/encls:
M. K. Pastor, Project Manager
,r ns 003 790718o747
ENCLOSURE 1 UNIiED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C.
20555 IE Bulletin No. 79-14 Date:
July 2, 1979 Page 1 of 3 SEISMIC ANALYSES FOR AS-BUILT SAFETY-RELATED PIPING SYSTEMS Description of Circumstances:
Recently two issues were identified which can cause seismic analysis of safety-related piping systems to yield nonconservative results.
One issue involveJ algebraic summat.icn of loads in some seismic 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 sent to all power reactor 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 -n-conformances to design documents have occurred in a number of plants, this issue is generic.
The staff has determined, where design specifications and drawings are used to obtain input informatun 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,: Ding systems as described in documents from which seismic analysis input info:1ation was obtained, the licensee must consider the need to re evaluate the seismic analyses to con-sider the as-built configuration.
Action to be taken by Licensees and Permit Holders:
All power reactor facility licensees and construction permit holders are requested to verify, unless verified to an equivalent degree within the last 12 months, that the seismic analysis applies to the actual configura-tion of safety-related piping syste!
E-
~-
Seismic Category I systems as defin DUPLICATE DOCUMENT I
Entire document previously entered into system under:
ANO bb US No. of pages:
006 I
w-
~a
.u.-
o.,=
-s