05000333/FIN-2010006-02
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Finding | |
|---|---|
| Title | Calculations for Offsite Power Availability |
| Description | The team identified a finding involving a non-cited violation of 10 CFR 50, Appendix B, Criterion III, \"Design Control,\" in that Entergy did not verify the adequacy of design with respect to establishing the basis for the offsite power minimum voltage and the degraded voltage relay reset setpoint. Specifically, Entergy failed to adequately evaluate the results of load flow studies that determined safety bus voltage would be below the relay reset value following some design basis events. The team concluded that this could result in separation of the vital busses from the offsite power supply during some design basis events. Entergy entered this issue in the corrective action ii Enclosure program to verify offsite power was operable, and instructed the offsite grid operator to raise the minimum grid voltage limit and revise the post accident grid loading profile. The finding is more than minor because it is associated with the design control attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The team determined the finding was of very low safety significance (Green) because it was a design deficiency confirmed not to result in a loss of the offsite power supply operability or functionality. This finding had a cross-cutting aspect in the area of Human Performance Resources because the licensee did not ensure that personnel, equipment, procedures, and other resources are available to ensure complete, accurate and up-to-date design documentation. Specifically, the acceptance criteria in the recently completed calculations that evaluated the offsite power voltage limit was not correct which resulted in an incorrect evaluation of the results of the calculation. |
| Site: | FitzPatrick  |
|---|---|
| Report | IR 05000333/2010006 Section 1R21 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | K Mangan G Skinner J Schoppy D Orr T Tinkel L Doerflein P Mckenna |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - FitzPatrick - IR 05000333/2010006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (FitzPatrick) @ 2010Q3
Self-Identified List (FitzPatrick)
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