ML20217D261
| ML20217D261 | |
| Person / Time | |
|---|---|
| Issue date: | 01/07/1998 |
| From: | Diaz N NRC COMMISSION (OCM) |
| To: | Hoyle J NRC OFFICE OF THE SECRETARY (SECY) |
| Shared Package | |
| ML20217D082 | List: |
| References | |
| SECY-97-287-C, NUDOCS 9803270361 | |
| Download: ML20217D261 (2) | |
Text
1 NOT ATION VOTE RESPONSE SHEET TO: John C. Hoyle, Secretary i: ROM: COMMISSIONER DIAZ tiUBJECT: SECY-97-287 - FINAL REGULATORY GUIDANCE ON RISK-INFORMED REGULATION: POLICY ISSUES ApprovedhI" 0,4 Disapprovedb / Abstain l l
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Entered on "AS" Yes No 182 "c82s 288" CORRESPONDENCE PDR
h COMMISSIONER DIAZ' COMMENTS ON SECY-97-287 I approve the staff's recommendations regarding allowing very small risk increases independent of the baseline CDF and LERF. The licensees should track the cumulative effect of the approved changes as well as the changes realized using the 50.59 process. The staff should monitor licensee's cumulative risks by implementing the associated tasks in the PRA Implementation Plan.
I approve the staff's recommendation regarding the treatment of the uncertainties of the PRA results.
Although I agree with the staff's recommended interim approach for the acceptance guidelines for shutdown operations,I beli eve ht at h t e shd s s are well un ders t ut own rik oo dand therefore, (
further studies by RES in this area as outlined in the PRA Implementation Plan are not needed. J The Commission has provided its guidance on ensuring safety during shutdown operations in the j
- SRM associated with SECY-97-168.
DG-1061 describes an acceptable approach for using PRA in making risk-informed decisions on plant-specific changes to its current licensing basis. Therefore, the risk consideration for temporary plant configuration changes should not be part of DG-1061. I believe the Commission guidance in the SRM for SECY-97-173 set forth the basic principles in dealing with risks 1 associated with temporary plant configuration changes, thus, specific acceptance guidelines for temporary changes are not necessary. The licensees should assess potential risks associated with the temporary changes based on these basic principles. I support staff's recommendation of only using time-averaged guidelines for changes to the current licensing basis as well as temporary changes, except as supplemented iu DG-1065 for technical specification allowed outage times. I disapprove the proposal to undertake additional assessment of such guidelines for temporary clanges.
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