ML20138H431
| ML20138H431 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/01/1997 |
| From: | Nunn D SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9705070176 | |
| Download: ML20138H431 (2) | |
Text
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9 so-m um-k EDISON
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Vice President An LDISON INTLRNATIONAL Company May 1, 1997
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l U. S. Nuclear Regulatory Commission l
Attention: Document Control Desk Washington, DC 20555-0001 Gentlemen:
Subject:
Docket Nos. 50-361 and 50-362 Request for Information Pursuant to 10 CFR 50.54(f) Regarding Adequacy and Availability of Design Bases Information San Onofre Nuclear Generating Station (SONGS) Units 2 and 3
Reference:
Letter dated February 12, 1997 from Harold B. Ray (Edison) to the Documen't Control Desk (NRC); Same subject This letter is to clarify certain information in the above referenced letter.
Specifically, page 2 of the cover letter, page 1 of Enclosure E, and page 4 of Enclosure F state that Edison's Design Basis Documentation (DBD) program i
included the generation of new Appendix R safe shutdown logic diagrams.
The DBD program initiated a major effort to generate a new set of Appendix R safe shutdown logic diagrams to replace its existing ones. Although the generation of new diagrams was initiated, they were never completed or issued.
In the course of the effort an assessment indicated that it would be more cost-effective to revise the original logic diagrams than to complete the new ones. Therefore, work on the new diagrams was terminated.
The Appendix R safe shutdown logic diagram effort produced a report identifying issues requiring resolution including deficiencies in the existing logic diagrams.
These logic diagram issues were formally documented and tracked. The last issue was closed in December of 1996.
Despite the change in direction, the overall effort achieved its original objective which was to generate a set of reliable Appendix R safe shutdown logic diagrams.
9705070176 970501
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PDR ADOCK 05000361 P
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Document Control Desk Should you have any questions or require additional information regarding this' please contact me.
Sincerely,
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E. W. Merschoff, Regional Administrator, NRC 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 M. B. Fields, NRC Project Manager, San Onofre Units 2 and 3 i
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