ML20059A853
| ML20059A853 | |
| Person / Time | |
|---|---|
| Issue date: | 10/22/1993 |
| From: | Thomas Scarbrough Office of Nuclear Reactor Regulation |
| To: | Norberg J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9310270164 | |
| Download: ML20059A853 (2) | |
Text
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WASHINGTON, D.C. 20566-0001
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' October 22, 1993 MEMORANDUM FOR: James A. Norberg, Chief l
Mechanical Engineering Branch Division of Engineering THRU:
George Johnson, Section Chief Pumps and Valves Section Mechanical Engineering Branch Division of Engineering FROM:
Thomas G. Scarbrough Pumps and Valves Section Mechanical Engineering Branch Division of Engineering i
SUBJECT:
PUBLIC MEETING WITH NUMARC TO DISCUSS PRESSURE LOCKING AND THERMAL BINDING 0F GATE VALVES On October 4,1993, the NRC staff held a public meeting with the Nuclear Management and Resources Council (NUMARC) to discuss the potential for pressure locking and thermal binding of gate valves in nuclear power plants.-
1 Meeting participants included representatives of NUMARC and the Institute of Nuclear Power Operations (INPO); NRC staff members from the Offices of Nuclear i
Reactor Regulation (NRR), of Nuclear Regulatory Research (RES), and for the
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Analysis and Evaluation of Operational Data (AE0D); and a staff contractor i
from the Idaho National Engineering Laboratory (INEL). Enclosed is a list of the meeting participants.
In a letter dated February 8, 1993, the NRC staff forwarded AE0D study S92-07,
" Pressure Locking and Thermal Binding of Gate Valves," to NUMARC and.
3 recommended that NUMARC undertake an effort to develop specific guidance on approaches to analyze and remedy the potential problem.
In a letter to the NRC staff on May 24, 1993, NUMARC stated that it had-requested its members to provide data from their facilities regarding problems they have encountered 4
with pressure locking and thermal binding, and their resolution. NUMARC also i
stated that it had requested its members to provide information regarding what they had done to determine if they have systems which are susceptible to the problem. At the October 4 meeting, NUMARC stated that it did not consider additional guidance or a workshop necessary because the survey did not find any problems not previously identified. NUMARC did not have any information on licensee actions to determine whether systems are susceptible to the problem.
In addition, NUMARC stated that only one-third of the licensees responded to the survey. As a result of the information from licensees, the NUMARC representatives stated that the issue had not reached the threshold level of significance for NUMARC to address it.
The INP0 representative stated that he considers most licensees to have implemented previous INPO guidance on pressure locking and thermal binding.
($1 Dr. Earl J. Brown of AE00 provided a summary of the results of recent visitsq. {N I
by AE0D staff to nuclear power plants to discuss the pressure locking and' s
4 thermal binding issue with licensees.
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ENCLOSURE PARTICIPANTS AT THE PUBLIC MEETING TO DISCUSS PRESSURE LOCKING AND THERMAL BINDING 0F GATE VALVES (October 4, 1993)
HAME ORGANIZATION B. D. Liaw NRC/NRR/DE J. A. Norberg NRC/NRR/DE/EMEB J. E. Rosenthal NRC/AEOD E. J. Sullivan, Jr.
NRC/NRR/DE/EMEB-T. G. Scarbrough NRC/NRR/DE/EMEB E. J. Brown NRC/AEOD G. H.- Weidenhamer NRC/RES/EMEB R. J. Kiessel NRC/NRR/0GCB J. O. Schiffgens NRC/NRR/SPSB C. C. Hsu NRC/AEOD W. J. Hall NUMARC R. C. Callaway NUMARC D. J. Rains NUMARC G. B. Fader INP0 R. Steele INEL r
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