ML19269C707
| ML19269C707 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 02/02/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| Shared Package | |
| ML19269C708 | List: |
| References | |
| NUDOCS 7902120108 | |
| Download: ML19269C707 (1) | |
Text
~
disc /
p accW UNITED STATES 4
NUCLEAR REGULATORY COMMISSION y9 ff }' Cj REGloN 111 j
799 ROOSEVELT ROAD GLEN E LLY N, ILLINOIS 60137 s,
Docket No. 50-483 Docket No. 50-486 KB 02 R9 Union Electric Company ATTN:
Mr. John K. Bryan Vice President - Nuclear P. O. Box 149 St. Louis, MO 63166 Gentlemen:
This Information Notice is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities. No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely, WA $
(/ James G. Kepp er Director
Enclosures:
1.
IE Information Notice No. 79-01 2.
List of IE Information Notices Issued in 1979 cc w/encls:
Mr. W. H. Weber, Manager, Nuclear Construction Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR SIC IC Feoion I & IV Ms. K. Drey Hon. C. J. Frass, Chairman Missouri Public Service Commission
'iS0212 OIOS
t s
U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III February 2, 1979 IE Information Notice No. 79-01 BERGEN-PATERSON HYDRAULIC SHOCK AND SWAY,3RESTORS (HSSA) 1978, Rancho Seco Nuclear Generating Station reported (Snubber) units to lockup in On December 4, the failure of seven Bergen-Paterson HSSA ional unit to the compression direction and the failure of one additThese failures were identified lockup in the extension direction.
HSSA-3-6, surveillance testing and the affected models includedWhen the units we i
ide HSSA-10-6 and HSSA-20-6.
observed damage to the poppet valve and seat on the compress on s sion of the valve blocks of the seven units that failed in the comp The licensee poppet spring entrapped between the poppet and the seat.
direction.
i abusive attributed the seven failures in the compression direct on to handling during compression of the units for installation following The cause of the single the previous refueling outage.
In addition failure in the extension direction has not been determined.
testing at mitted to to exercising greater care in reinstallation, the licensee co=all Ber ent conditions which cause either physical damage to or sign functionally test The Bergen-Patersen Technical Maintenance Manual of piping.
hich lockap and bleed.reconmends that additional inspections should be made on may.htve participated in an unusual shock occurrence to,'piph g or equipment.
l On January 3,1979, the licensee reported that the decay heat remova form of a system had been subjected to a transient condition in the
" water hammer."
damage two rigid pipe support wall attachments.
l d that one of seven testing of the affected Bergen-Paterson units revea e(Model No. HSSA-3-6) was This unit units failed the lockup test. disassembled and damage to the poppet valve The damage to the poppet valves is presently being reviewed by b At the licensee and Bergen-Paterson.
been not been completely defined nor has appropriate correcti however, the cause and extcnt of damage are not known at determined.
damage; this time.
]OP6 79021go959
February 2, 1979 lE Information Notice No. 79-01 f a possibly This information is provided as an early notification orecipients will review the It is expected that i
No specific significant matter.information for possible applicability to their f acilit es.If fu action or response is requested at this time.so indicate, a d to recommend or request specific licensee actions.
f the appropriate NRC Regional this matter, please contact the Director o Office.
Page 2 of 2
IE Information Notice No. 79-01 February 2, 1979 LISTING OF IE INYORMATION NOTICES ISSUFr IN 1979 Issued To Date Information
~ Subject Issued Notice No.
An Information Notice is a new method of communicating items of This item Informati,on Notice potential interest to licensees.No. 79-01, is the first of this new form of co l
8