ML20081K097
| ML20081K097 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/24/1995 |
| From: | Marsh W SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-88-20, NUDOCS 9503280396 | |
| Download: ML20081K097 (2) | |
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Southem Califomia Edison Company 23 PARKER STREET 1RVINE. CALIFORNIA 92718 March 24, 1995 wALTEn c. ensa me-
' At* WER OF NUCLS AR MEtauLATORY AFF AIRS (714) 4!b4 4403 U. S. Nuclear Regulatory Commission
' Attention: Document Control Desk Washington, D.C.
20555 Gentlemen:
Subject:
Docket Nos. 50-361 and 50-362 Response to Generic Letter 88-20, " Individual Plant Examination I
for Severe Accident Vulnerabilities" San Onofre Nuclear Generating Station Units 2 and 3 1
References:
1.
Letter from R. M. Rosenblum to Document Control Desk, December i
23, 1991, Docket No. 50-361 and 50-362, Individual Plant j
Examination of External Events (IPEEE), Generic Letter 88-20, i
Supplement 4, San Onofre Nuclear Generating Station.
J 2.
Letter from R. M. Rosenblum to Document Control Desk, June 9, 1992, Docket No. 50-361 and 50-362, Individual Plant Examination of External Events (IPEEE), San Onofre Nuclear Generating Station.
3.
Letter from Mel Fields to R. M. Rosenblum, June 22, 1992, Review of Response to Generic Letter 88-20, Supplement No. 4 -
Individual Plant examinations for External Events - San Onofre Unit Nos. 1 and 2 (TAC Nos. M83671 and M83672).
4 i
This letter provides a schedule update for submitting the Edison response to J
Generic Letter 88-20, Supplement No. 4 - Individual Plant Examination for External Events. The schedule has changed from June 1,1995 to December 31, 1995.
Edison originally proposed a submittal date of June 28, 1996 in Reference 1.
This proposed schedule was later accelerated to June 30, 1995 because of the increased resources available due to the permanent shutdown of SONGS 1 (Reference 2).
The NRC approved a submittal date of June 1,1995 (Reference 3) and requested that Edison inform the NRC of any changes in the schedule. This letter is to inform the NRC, as requested, that the current schedule for the SONGS 2&3 IPEEE submittal has been delayed to December 31, 1995.
Edison is performing a full-scope seismic Probabilistic Risk Assessment (PRA) for Units 2 & 3 to satisfy the IPEEE requirements. The full-scope effort involves the generation of seismic hazard curves, an evaluation of the soil-structure interactions, development of new floor response spectra for critical structures, numerous fragility evaluations of components and structures, analysis of relay chatter impact on equipment response, and extensive fault l
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tree modeling.
The iterative nature and phasing relationships associated with these efforts has required more time than anticipated when the completion date of Reference 2 was predicted. However, the project is sufficiently underway that Edison has full assurance that the new submittal date of December 31, 1995 will be met.
If you have any questions, please call me.
Sincerely, a$D 0 l cc:
L. J. Callan, Regional Administrator, NRC Region IV A. B. Beach, Director, Division of Reactor Projects, Region IV K. E. Perkins, Jr., Director, Walnut Creek Field Office, NRC Region IV J. A. Sloan, NRC Senior Resident Inspector, San Onofre Units 2 & 3 H. B. Fields, NRC Project Manager, San Onofre Units 2 and 3 L
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