ML19269C729
| ML19269C729 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 02/02/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Linder F DAIRYLAND POWER COOPERATIVE |
| Shared Package | |
| ML19269C730 | List: |
| References | |
| NUDOCS 7902120132 | |
| Download: ML19269C729 (1) | |
Text
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UNITED STATES 4
y e-NUCLEAR REGULATORY COMMISSION y
- r 799 ROOSEVELT ROAD y
REGloN lll GLEN ELLYN, ILLINotS 60137 Docket No. 50-409 FEB 0 21979 Dairyland Power Cooperative ATTN:
Mr. F. W. Linder General Manager 2615 East Avenue - South La Crosse, WI 54601 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 m garding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely,
[Q O k [er* --
James G. Kepp Director
Enclosures:
1.
IE Information Notice No. 79-01 2.
List of IE Information Notices Issued in 1979 cc w/encls:
Mr. R. E. Shimshak, Plant Superintendent Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR pSIC STIC Anthony Roisman, Esq.,
Attorney 7902120 iScl
U.S. NUCLEAR REGULATORY COMMISSION
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OFFICE OF INSPECTION AND ENFORCEMENT REGION III February 2,1979 lE Information Notice No. 79-01
- BERGEN-PATERSON HYDRAULlC SHOCK AND SWAY ARRE d
On December 4, 1978, Rancho Seco !iuclear Generating Station reporte) uni the failure of seven Bergen-Paterson HSSA (Snubberdditional unit to the compression direction and the failure of one aThese failures were identified during lockup in the extension direction.
36 surveillance testing and the affected models included HSSA,When th i n side HSSA-10-6 and HSSA-20-6.
observed damage to the poppet valve and seat on the compress o ion 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.
busive attributed the seven failures in the compression direction to a handling during compression of the units for installation following The cause of the single testing at the previous refueling outage. failure in the extension direc In addition mitted to to exercising greater care in reinstallation, the licensee ificant movement conditions which cause either physical damage to or sign This testing will include verification of pisten movement The Bergen-Paterson Technical Maintenance Manual of piping.
hich lockup and bleed. recommends that additional inspections should be made on l i g known damage may have participated in an unusual shock occurrence invo v n to." piping or equipment.
l On January 3, 1979, the licensee reported that the decay heat remova h form of a system had been subjected to a transient condition in t ecaused pipe moveme This transient, The subsequent functional
" 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 the licensee and Bergen-Paterson.
i been not been completely defined nor has appropriate corrective however, the cause and extent of damage are not known at determined.
damage; this time.
fd W ISO 2120059
February 2, 1979 IE Information Notice No. 79-01 This information is provided as an early notification of a possibly It is expected that recipients will review the significant matter.
No specific information for possible applicability to their facilities.
If further NRC evaluations action or response is requested at this time.
so indicate, an IE Circular or L l'stin will be issued to recommend or.
If you have questions regarding request specific licensee actions.
this matter, please contact the Director of the appropriate NRC Regional Office.
Page 2 of 2
IE Information Notice ;o. 79-01 February 2, 1979 LISTING OF IE INFORMATION NOTICES ISSUED IN 1979 Information Subject Date Issued To Issued Notice No.
An Information Notice is a new method of communicating items of potential interest to licensees. This item, Information Notice No. 79-01, is the first of this new form of c.ommunication.
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