05000327/FIN-2015007-02
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Finding | |
|---|---|
| Title | Failure to meet Design Basis Requirements to have Interlocks between Shared systems |
| Description | The inspectors identified a Green non-cited violation (NCV) of 10 CFR 50 Appendix B Criterion III, Design Control, for the licensees failure to ensure that plant licensing and design basis for shared Class 1E electrical systems were controlled and maintained. The licensing and design basis of shared electrical systems required mechanical interlocks to prevent an operator error that could parallel these diverse power sources in accordance with IEEE 308-1971 and Regulatory Guides 1.81 and 1.6. A modification removed the kirk-key interlocks. The issue was entered into the licensees corrective action program as CR 1064736. The licensee has administrative controls in place to limit the risk of this configuration pending determination of corrective actions. The inspectors determined that the performance deficiency was more than minor because it was associated with the Design Control attribute of the Mitigating Systems Cornerstone and the removal of mechanical interlocks that separated diverse shared electrical systems adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding was determined to have a cross-cutting aspect in the conservative bias area of Human Performance [H.14] because the licensees decision making-practices did not emphasize prudent choices over those that are simply allowable. |
| Site: | Sequoyah  |
|---|---|
| Report | IR 05000327/2015007 Section 1R17 |
| Date counted | Sep 30, 2015 (2015Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.17 |
| Inspectors (proximate) | D Terry-Ward J Bartley P Carman R Bennett T Fanelli |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Sequoyah - IR 05000327/2015007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Sequoyah) @ 2015Q3
Self-Identified List (Sequoyah)
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