ML20028D467
| ML20028D467 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/12/1983 |
| From: | Ernst M Office of Nuclear Reactor Regulation |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20028D338 | List: |
| References | |
| NUDOCS 8301190165 | |
| Download: ML20028D467 (2) | |
Text
__
i.
January 12, 1983 Docket No. 50-245 MEMORANDUM FOR:
Harold R. Denton, Director Office of Nuclear Reactor Regulation FROM:
Malcolm L. Ernst, Assistant Director for Technology Division of Safety Technology, NRR
SUBJECT:
MILLSTONE 1 INTEGRATED ASSESSMENT On December 13, the ACRS issued a letter on the Millstone SEP integrated assessment which implied that plant-specific PRAs were not any more useful than the more limited risk analyses developed for the other SEP plants.
You asked me about the meaning of this statement, particularly with regard to the broader implications on NREP.
We met with the ACRS on this issue on January 6, 1983, and determined the following:
1.
The meaning of the ACRS statement was very narrow and only meant that performance of a PRA would not be justified solely for the purpose of obtaining a risk perspective on the results of the SEP topic reviews.
We agree with that judgment.
2.
In general the ACRS still appears to support a program like NREP, although there is a valid concern regarding how one might make regulatory decisions based on the results of PRAs.
Dt. ring the discussion w.Lh the ACRS the staff made it clear that there were a number of Millstone issues of low risk significance which, based on the risk analysis, would not appear to warrant hardware changes.
- However, hardware changes were likely to be made by the licensee on their own initiative. We pointed out that had these changes been at NRC's initiative, some of them might not have been imposed. We also pointed out that the quantitative assessments at Millstone yielded some insights on certain issues that were different from the risk judgments made on similar issues 9301190165 830112 PDR ADOCK 05000245 O
PDR omce) suR m e) l ourp I. NRC fonM 3!8 p0 6q NRCM Opp _
@0V0GOMJ3COR D COPY usc e e - m w
l
? January 12, 1983 using the more qualitative PRA approach used on the previous SEP reviews.
These insights could influence future SEP reviews simply because less emphasis might be directed toward those areas where previous reviews have indicated little risk reduction benefit. is a copy of a memorandum that presents the results of the Millstone ACRS meeting and the policy implications of the risk insights gleaned from the PRA.
The ACRS letter of December 13, 1982, is included in that memorandum. is a copy of the ACRS letter of January 11, 1983, which provides the supplemental ACRS comments.
/s/
Malcolm L. Ernst, Assistant Director for Technology Division of Safety Technology, NRR
Enclosures:
1.
Memo to D. Eisenhut from F. Miraglia and M. Ernst dated 12/28/82 2.
Letter to W. Dircks from J. Ray dated 1/11/83 cc w/ enclosures:
T. Speis cc w/o enclosures:
F. Miraglia A. Thadani W. Russell DISTRIBUTION:
T Docket Filej(50-245)f 3 NRC PDR Local PDR NSIC M. Ernst AD/T R/F omcep.....A..,
..'D..S..T....
sua~wo
........./..L LM 1/..l. 7./83 oan >
. ~..
NRC FORM M 00-80) NRCM Ona.
. OFFICIAL RECORD COP 7.
usam a-mm