05000461/FIN-2013009-01
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Finding | |
|---|---|
| Title | Insulation Resistance Testing for Unit Substation Transformers Was Incorrectly Performed |
| Description | A finding of very low safety significance (Green) and associated non-cited violation (NCV) of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was self-revealed from an event that resulted in a reactor scram. Specifically, during troubleshooting of the Unit Substation A transformer failure on December 08, 2013, it was identified that the licensee incorrectly measured the resistance between the three phases of the transformer windings instead of measuring the resistance between the phase windings and ground. The licensee entered this concern into its Corrective Action Program as IR 01594794, and satisfactorily remeasured the insulation resistance for the un-faulted transformer 1AP11E. The performance deficiency was determined to be more than minor because it was associated with the Mitigating Systems cornerstone attribute of equipment performance and 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 screened as very low safety significance (Green), because the inspectors answered No to all Mitigating Systems Screening questions in Exhibit 2 of Appendix A of IMC 0609. The finding was determined to have a cross-cutting aspect in the area of human performance, associated with the work control component, in that the licensee failed to ensure supervisory and management oversight of work activities, including contractors, such that nuclear safety is supported. H.4(c). [Section 4OA3.2.b (1)] |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2013009 Section 4OA3 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | A Boland A Dahbur B Bonser C Phillips J Mcghee |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| CCA | H.2, Field Presence |
| INPO aspect | LA.2 |
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Finding - Clinton - IR 05000461/2013009 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2013Q4
Self-Identified List (Clinton)
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