ML19224D649
| ML19224D649 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 07/02/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| References | |
| NUDOCS 7907130259 | |
| Download: ML19224D649 (1) | |
Text
.
\\ f [b --)
ga arcq e #
'o UNITED STATES
! \\*,., 7/[,g NUCLEAR REGULATORY COMM SSION o, h 'h[dl
- /
~ /
c REGION 111 3
f 799 ROOSEVELT ROAD
\\ '.%/ [/
GLEN ELLYN, ILLINOIS 60137
- ..+
'I J',..
Docket No. 50-440 Docket No. 50-441 The Cleveland Electric Illuminating Company ATTN:
Mr. Dalwyn R. Davidson Vice President - Engineering P, O. Box 5000 Cleveland, 03 44101 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 this office.
Sincerely, Q & n ba -_
(/ James G. KeppTer Director
Enclosure:
IE Bulletin No. 79-14 cc w/ encl:
Centri.1 Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Harold W. Yettn, Power Siting Commission Mr. Daniel D. Wilt, Attorney 444 272 v
790713009)
Q
e U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III July 2, 1979 IE Bulletin No. 79-14 SEISMIC ANALYSES FOR AS-BUILT SAFETY-RELATED PIPING SYSTDiS Description of Circumstances:
Recenty two issues were identified which can cause seismic analysis of safety-related piping systems to yield nonconservative results.
One issue involved algebraic summation 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 addassed 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 t i ilt configuration of several piping systems revealed a number of noncoaformances to design c.ocuments which could potentially affect tue 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 number of plants, this issue is generic.
The staff has determined, where design specifications and drawings are used to obtain 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 licensee must consider the need to re-evaluate the seismic analyses to con-sider the ac-built configuration.
m.
..m DUPLICATE DOCUMENT
Entire document previously entered
, -[,
4kk L
into system under:
I ANO 7 h
b No. of pages:
s
, u. : - m -
u....
- w. m-
.m~
- ,~ ~; s.y y ' y ~
L