ML19269C749
| ML19269C749 | |
| Person / Time | |
|---|---|
| Site: | Bailly |
| Issue date: | 02/02/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Shorb E NORTHERN INDIANA PUBLIC SERVICE CO. |
| Shared Package | |
| ML19269C750 | List: |
| References | |
| NUDOCS 7902120147 | |
| Download: ML19269C749 (1) | |
Text
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UNITED STATES
/t NUCLEAR REGULATORY COMMISSION f
- f i ^^ l ' h REGION lil f
799 ROOSEVELT ROAD
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GLEN E LLYN, IL LINols 60137 FFR -
Docket No. 50-367
'lG Northern Indiana Public Service Company ATTN:
Mr. Eugene M. Shorb Senior Vice President 5265 Hohman Avenue Hammond, IN 46325 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.
Sinceren,
James G. Keppler Director
Enclosures:
1.
IE Information Notice No. 79-01 2.
List of IE Information Notices Issued in 1979 cc w/encls:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC NIC Mr. Dean Hansell, Office of Assistant Attorney General 780212 O 19'j'
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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 ARRESTORS (HSSA)
On December 4, 1978, Rancho Seco Nuclear Generating Station reported the failure of seven Bergen-Paterson HSSA (Snubber) units to lockup in the compression direction and the failure of one edditional unit to lockup in the extension direction. These failures were identified during surveillance testing and the affected models included HSSA-3-6, HSSA-10-6 and HSSA-20-6. When the units were disassembled, the licensee observed damage to the poppet valve and seat on the compression side of the valve blocks of the seven units that failed in the compression direction.
It was also observed that five of the seven units had the poppet spring entrapped between the poppet and the seat. The licensee attributed the seven failures in the compression direction to abusive handling during compression of the units for installation following testing at the previous refueling outage. The cause of the single failure in the extension direction has not been determined. In addition to exercising greater care in reinstallation, the licensee co==itted to functionally test all Bergen-Paterson snubbers subjected to transient conditions which cause either physical damage to or significant movec;r.t of piping. This testing will include veritication of piston movement, lockup and bleed. The Bergen-Paterson Technical Maintenance Manual recommends that additional inspections should be made on units which may.have participated in an unusual shock occurrence involving known damage to.' piping or equipment.
On January 3, 1979, the licensee reported that the decay heat removal system had been subjected to a tran>ient condition in the form of a
" water hammer." This transient, caused pipe movement great enough to damage two rigid pipe support wall attachments. The subsequent functional testing of the affected Bergen-Paterson units revealed that one of seven units failed the lockup test. This unit (Model No. HSSA-3-6) was disassembled and damage to the poppet valve and seat was observed.
The damage to the poppet valves is presently being reviewed by both the licensee and Eergen-Paterson. At this time, the cause of damage has not been completely defined nor has appropriate corrective action been determined. Other licensees have reported instances of poppet valve damage; however, the cause and extent of damage are not known at this time.
OdPS 7902120059
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 inf ormation for possible applicability to their f acilities.
If further NRC evaluations action or response is requested at this time.
so indicate, an IE Circular or Balletin will be issued to recommend or.
request specific licensee actions. If you have questions r4garding this matter, please contact the Director of the appropriate NRC Regional Office.
Page 2 of 2
IE Information Notice No. 79-01 February 2, 1979 1.'..3 TING OF IE INFORMATION ECTICES ISSUED IN 1979 Information Subject Date Issued To Notice No.
Issued An Inf,rmation Notice is a new method of communi ating items of potential interest to licensees. This item, Infocmation Notice No. 79-01, is the first of this new form of comnunication.
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