ML20211K137
| ML20211K137 | |
| Person / Time | |
|---|---|
| Issue date: | 11/07/1986 |
| From: | Bernero R Office of Nuclear Reactor Regulation |
| To: | Speis T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20209E138 | List: |
| References | |
| FOIA-87-10 NUDOCS 8611170045 | |
| Download: ML20211K137 (1) | |
Text
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MEMORANDUM FOR: Themis P. Speis, Director HOV 071985 Division of Safety Review and Oversight FROM:
Robert M. Bernero, Director Division of BWR Licensing
SUBJECT:
DRAFT REPORTS " PREVENTION AND MITIGATION OF SEVERE ACCIDENTS IN A BWR-4 WITH A MARK I CONTAINMENT",
DATED SEPTEMBER 1986 AND " PREVENTION AND MITIGATION OF SEVERE ACCIDENTS IN A BWR-6 WITH A MARK III CONTAINMENT Pursuant to your request, we have reviewed the subject documents in the light of current plans for implementing certain provisions of the Comission's Severe Accident Policy Statement.
It is our understanding that final versions of these reports will be transmitted to licensees as accompanying appendices to a proposed generic letter requesting them to perform individual plant evaluations in accordance with staff approved methodology based upon the IDCOR work. Although we find that the technical content of the reports to have considerable merit, the proposed guidelines and criteria, which are very prescriptive, appear to preempt the whole idea behind the individual plant evaluation concept as a search for potential vulnerabilities (outliers) that are plant specific.
In effect these guidelines and criteria would have the appearance of saying to these licensees that the staff expects their IPEs to reach the same (essentially generic) conclusions not only(as to what should be
" fixed", but to some extent how to implement the fixes.
Guideline 8A - of the BWR-4 report appears to be the single exception to this statement and could be viewed as a potential supplement, if that is necessary, to the IDCOR proposedIPEmethodology.-)
It is not at all clear to us that there is a need for these particular
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licensees to spend the time and money to carry out the analyses, at least for the containment portions, when it appears that we are very close to agreerrent as to measures that might be justifiably " required" to improve substantially the safety margins of the BWR containments in consideration of potential l
severe accident stresses.
It is for this reason that DBL has taken an initiative in this regard.
I suggest, therefore, that we continue to o
coordinate our efforts regarding BWR containments and would urge your consideration of some modification of your earlier plans, as set forth in SECY-86-76, regarding the need for back end IPEs for BWR containments. The DBL staff is prepared to work with your staff to this pnd.
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DISTRIBUTION L
Central File Robert M. Bernero, Director DBL R/F CLainas Division of BWR Licensing PD#2 R/F RHouston MThadani cc:
H. R. Denton DMu11er
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DATE :9 /9 /86
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