05000387/FIN-2013002-05
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Finding | |
|---|---|
| Title | Inadequate Procedure for Control Room Cooling Fan Train Failure |
| Description | A self-revealing NCV of 10 CFR 50 Appendix B, Criteria V Instructions, Procedures, and Drawings, was identified because PPL did not ensure alarm response procedures (ARPs) for control room cooling fan train failures were adequate, which resulted in the subsequent loss of both trains of cooling during clearance order (CO) application for fan repair work. Specifically, the ARP actions were deficient in allowing an abnormal system control switch configuration that led to the inadvertent shutdown of the in-service B train fans during the application of the CO process to perform work on the failed A control room cooling fan train. PPL entered the issue into their CAP to repair the failed damper and also evaluate the extent-of-condition to ensure the adequacy of other applicable ventilation procedures. The inspectors determined the deficiency was more than minor because it was associated with the Procedure Quality attribute of the Mitigating System Cornerstone. The inadequate procedure resulted in the loss of control room cooling fans, which affects the objective to ensure the availability and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors determined through a review of IMC 0609 Appendix A, Exhibit 2, Mitigating Systems Screening Questions, that the finding was of very low safety significance (Green) because the finding was not related to a design or qualification deficiency, did not represent a loss of a credited mitigating system safety function because cooling was restored in a timely manner, and did not screen as potentially risk significant due to external initiating events. The control room operators immediately recognized the loss of cooling and took manual action to restart the B cooling train within 15 minutes to ensure control room temperatures were not adversely affected. The finding did not have a cross-cutting aspect because the inadequate ARP was an historical issue not indicative of current performance. Specifically, the procedures had not been adequately identified and revised in 2003 and this occurred outside of the nominal three-year period for evaluating present performance as defined in IMC 0612, section 03.15. Additionally, PPL has instituted procedure and CAP improvements since that time which would have prevented the performance deficiency. |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2013002 Section 4OA3 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | P Kaufman M Gray F Arner P Finney J Ayala J Greives C Lally |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| INPO aspect | |
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Finding - Susquehanna - IR 05000387/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2013Q1
Self-Identified List (Susquehanna)
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