ML20035E736
| ML20035E736 | |
| Person / Time | |
|---|---|
| Issue date: | 03/08/1993 |
| From: | Selin I, The Chairman NRC COMMISSION (OCM) |
| To: | Chilk S NRC OFFICE OF THE SECRETARY (SECY) |
| References | |
| FRN-57FR14514, REF-GTECI-B-56, REF-GTECI-EL, TASK-B-56, TASK-OR AE06-1-026, AE6-1-26, NUDOCS 9304190169 | |
| Download: ML20035E736 (2) | |
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REi. EASED TO THE PDR HOTATION V O T E' ggjq, 4
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w ir RESPONSE SHEET
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T0:
SAMUEL J. CHILK, SECRETARY OF THE COMISSION l
FROM:
THE CHAIRMAN i
SUBJECT:
SECY-93-044 - RESOLUTION OF GENERIC SAFETY ISSUE B-56, " DIESEL GENERATOR RELIABILITY" I'
APPROVED x
DISAPPROVED ABSTAIN Nor PARTICIPATING REQUEST DISCUSSION l
C0l44ENTS:
See attached comments.
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l MM 93o419o169 930aos PDR CoMMS NRCC conneseosoence eor SIGNATURE
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RELEASE VOTE
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5// 'hJ WITHHOLD VOTE
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YESy/No L l0 ENTERED ON "AS"
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i Chairman's comments on SECY-93-044 l
f I approve the staff's proposed option, but I would like to emphasize the following thoughts and concerns:
The importance of maintaining ac power, and consequently in having reliable diesel generator performance, in assuring a low likelihood of core damage has consistently been shown in risk assessment studies.
l Since promulgation of the station blackout rule, the nuclear industry has made real progress in improving the reliability of j
diesel generators to start and run upon demand, and the current industry-wide average reliability, in excess of 98 percent, is quite satisfactory.
In balancing the recognition of these efforts and the high level of actual diesel generator reliability l
achieved against the clear need to maintain cuch performance, I believe that a rule is not necessary.
Nevertheless, I consider it imperative that this action not be l
misinterpreted as a signal that past efforts and vigilance can now be relaxed or possibly disbanded.
Hence, I urge both staff l
and the industry to continue with an aggressive program of l
maintenance as well as root cause analysis that vill continue to offer assurance that diesel generator reliability will be maintained at a satisfactory level in the future.
Finally, I urge that staff and industry focus on (1) evaluation methods and techniques that will permit rapid and early means of detecting significant degradation of diesel generator reliability, (2) examine diesel generator testing frequency and balance these with considerations of additional wear, and (3) explore the potential vulnerabilities of those applications where fewer than two safety-related power sources per unit, on average, are installed.
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