ML20148E121
| ML20148E121 | |
| Person / Time | |
|---|---|
| Issue date: | 05/15/1997 |
| From: | Diaz N NRC COMMISSION (OCM) |
| To: | Hoyle J NRC OFFICE OF THE SECRETARY (SECY) |
| Shared Package | |
| ML20148E047 | List: |
| References | |
| SECY-97-088-C, SECY-97-88-C, NUDOCS 9706020285 | |
| Download: ML20148E121 (2) | |
Text
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l,'
- NOTATION VOTE -
! l RESPONSE SHEET j l
j i j .TO: John C. Hoyle, Secretary 4
FROM: COMMISSIONER DIAZ i
SUBJECT:
SECY-97-088 - NRC STAFF'S POSITION ON l l AUGMENTED EXAMINATION REQUIREMENTS FOR BOILING WATER REACTOR PRESSURE VESSELS
- PURSUANT TO 10 CFR 50.55A(g) (6) (ii) (A)
! jQ
, Approved Disapproved N //n Abstain f 'tP'V j
Not Participating Request Discussion i
COMMENTS:
i i
A
~
/S NAfGRE )
j Release Vote / / 5-)547 i DATE Withhold Vote / /
Entered on "AS" Yes No 9706020285 970530 PDR COMMS NRCC CORRESPONDENCE PDR
l COMMISSIONER DIAZ' COMMENT ON SECY-97-088 Neither SECY-97-088 nor the 5/15 Commission briefing on the same subject supported the staff's recommendations of augmented inspection of essentially 100% of the circumferential and ,
longitudinal reactor pressure vessel (RPV) welds on an expedited basis. Furthermore, I did not !
find sufficient technical basis to support the staff s denial of BWRVIP's proposal of a technical j alternative. Therefore, I do not support staffs proposal to issue the attached letter to the BWRVIP. I suggest the following staff actions for the resolution of this issue.
The staff should issue its Safety Evaluation on the technical altemative proposed by the BWRVIP. This should be done with full consideration of NRC's defense-in-depth philosophy l and a thorough review of the probabilistic fracture mechanics submitted in support of the l proposed alternative. I believe that a well executed and timely inspection of 100% of the longitudinal welds in BWR RPVs will provide a reasonable baseline for safety determination.
Upon completion of this inspection, the staff will then consider whether additional requirements for circumferential RPV weld inspections are warranted.
For the longer term, in response to the petition for rulemaking by the BWRVIP, the staff should take into consideratim the technical merits from the results of the ASME code committee's effort as well as the results from licensees' reactor vessel weld inspections.
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