05000259/FIN-2015001-03
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Finding | |
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| Title | Failure to Maintain an Operating Procedure Resulted in the D EDG EXceeding its Technical Specification Allowed Outage Time |
| Description | A Self Revealing NCV of 10 CFR Part 50 Appendix B, Criterion V Instructions, Procedures, and Drawings was identified for the licensees failure to maintain an adequate operating procedure for the D Emergency Diesel Generator (EDG) that resulted in inoperability that exceeded the allowed outage time. The licensees immediate corrective actions were to restore the D EDG to operability and to replace the D EDG control switch with one that matched the other seven EDGs. The violation was entered into the licensees corrective action program as PER 990793. The performance deficiency was more than minor because it adversely affected the mitigating systems cornerstone objective of equipment performance. This violation required a Phase II analysis because the 0612 Appendix A Mitigating Systems Exhibit question of whether the finding represented an actual loss of a single trains function for greater than its technical specification allowed outage time was answered yes. The regional Senior Reactor Analyst performed a detailed risk analysis for the performance deficiency using the NRCs risk software, and the Unit 2 model. Assumptions included using a conservative screening value for the operator recovery, and the assumption that a common cause failure was not involved. The dominant risk sequences were the loss of offsite power, failures of suppression pool cooling, failure to recover power within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, and failure of alternate low pressure injection. The short period the EDG was unavailable, and the lack of a common cause resulted in a Green finding. The performance deficiency was assigned a crosscutting aspect of Resources because the licensee did not properly prioritize procedure upgrade resources to ensure that procedures for the D EDG were adequate (H.1). |
| Site: | Browns Ferry  |
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| Report | IR 05000259/2015001 Section 1R15 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | A Ruh D Dumbacher D Retterer L Pressley M King T Stephen |
| Violation of: | 10 CFR 50 Appendix B Criterion V Technical Specification Technical Specification - Procedures |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
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Finding - Browns Ferry - IR 05000259/2015001 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2015Q1
Self-Identified List (Browns Ferry)
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