ML19224A484
| ML19224A484 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/02/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Herbein J METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7902130009 | |
| Download: ML19224A484 (2) | |
Text
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8 UNITED STATES
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NUCLEAR REGULATORY COMMISs!ON h
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February 2, 1979 Docket Nos. 50-289 50-320 Metropolitan Edison Company ATTN:
Mr. J. G. Herbein Vice President - Generation P. O. Box 542 Reading, Pennsylvania 19640 Gentlemen:
Enclosed is the first in a series of IE Information Notices which will supplement IE Circulars and Bulletins as means of communicating significant matters to licensees. The specific purpose of Information Notices is to provide early notification of possible significant matters.
It is expected that recipients will review the information for possible applicability to their facilities.
If further NRC evaluations of the subjects so indicate, :E Circulars or Bulletins will be issued to recommend or request specific licensee actions.
If you have any questions regarding the enclosed, please contact the Direqtor of the appropriate NRC Regional Office.
Sincerely,
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kn oyce H. Grier
' Director
Enclosures:
1.
IE Information Notice No. 79-01 2.
List of IE Information Notices Issued in 1979 g
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Metropolitan Edison Company 2
cc w/encls:
E. G. Wallace, Licensing Manager J. J. Barton, Project Manager R. C. Arnold, Vice President - Generation L. L. Lawyer, Manager - Generation Operations - Nuclear G. P. Miller, Superintendent J. L. Seelinger, Unit 1 Superintendent J. B. Logan, Unit 2 Superintendent G. A. Kunder, Unit 2 Superintendent - Technical Support I. R. Finfrock, Jr.
M.. R. Conrad G. F. Trowbridge, Esquire Mis 3 Mary V. Southard, Chairman, Citizens for a Safe Environment
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 IE Information Notice No. 79-01 Date:
February 2,1979 Psge 1 of 2 BERGEN-PATERSON HYDRAULIC SH0CK AND SWAY ARREST 0RS (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 additional unit to lockup in the extension direction. These failures were identified during surveillance testing and the affected models included HSSA-3-6, HSSA 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 exercisir.g greater care in reinstallation, the licensee committed to functionally test all Bergen-Paterson snubbers subjected to t'.asient conditions which cause either physical damage to or significant movement of niping.
This testing will include verification of piston movement, lockup and bleed. The Bergen-Paterson Technical Maintenance Manual recommands 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 transient 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 testir:g of the affected Bergen-Paterson units revealed that one of seven units failed the lockup test. This unit (Model No. HSSA-3-6) was dis-assembled and damage to the poppet valve and seat was observed.
The damage to the poppet valves is pm t
beinq reviewed by both the licensee and Bergen-Paterson. At th
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been completely defined nor has appr DUPLICATE DOCUMENT determined.
Other licensees have re damage; however, the cause and exte Entire document previously entered time.
Into system under:
ANO 7702/20059 9 - 13'7 79 No. Of pages:
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