05000361/FIN-2008005-03
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Finding | |
|---|---|
| Title | Failure to Report Changes to Mitigating Systems Performance Index Risk Coefficients |
| Description | The inspectors sampled licensee submittals for the Mitigating Systems Performance Index - Residual Heat Removal System performance, for Units 2 and 3, for the period from the 3rd quarter 2007 through the 2nd quarter 2008. To determine the accuracy of the performance indicator data reported during those periods, performance indicator definitions and guidance contained in Nuclear Energy Institute Document 99-02, Regulatory Assessment Performance Indicator Guideline, Revision 5, was used. The inspectors reviewed the licensees operator narrative logs, issue reports, mitigating systems performance index derivation reports, event reports and NRC integrated inspection reports for the period of July 2007 through June 2008, to validate the accuracy of the submittals. The inspectors reviewed the mitigating systems performance index component risk coefficient to determine if it had changed by more than 25 percent in value since the previous inspection, and if so, that the change was in accordance with applicable Nuclear Energy Institute guidance. The inspectors also reviewed the licensees issue report database to determine if any problems had been identified with the performance indicator data collected or transmitted for this indicator. Specific documents reviewed are described in the attachment to this report. These activities constitute completion of two mitigating systems performance index residual heat removal system samples as defined by Inspection Procedure 71151-05. The inspectors identified that the licensee had made changes to the risk (Birmbaum) coefficients over several quarters and had failed to report these changes as required by Nuclear Energy Institute Document 99-02. The NRC is reviewing the bases for the changes and the effect the changes have had on the reported Performance Indicator data. The licensee documented this issue in Nuclear Notification 200255473. The failure to include a comment that provided a summary of any changes to the Mitigating Systems Performance Index coefficients with the quarterly data submittals is being considered an unresolved item pending further NRC review: URI 05000361;05000362/2008005-03, Failure to Report Changes to Mitigating Systems Performance Index Risk Coefficients |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2008005 Section 4OA1 |
| Date counted | Dec 31, 2008 (2008Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71151 |
| Inspectors (proximate) | P Elkmann B Henderson R Kopriva L Carson S Garchow J Reynoso G Warnick M Young M Hay R Baldwin A Fairbanks S Makor T Buchananp Elkmant Steadham J Reynoso G Warnick C Osterholtz M Hay |
| INPO aspect | |
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Finding - San Onofre - IR 05000361/2008005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2008Q4
Self-Identified List (San Onofre)
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