05000461/FIN-2015002-05
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Finding | |
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| Title | Failure to Evaluate the Operational Impact of the TDRFP Lockout Switch Position |
| Description | A self-revealed finding was identified for failure to evaluate the consequences of an adverse condition in accordance with the operational decision making process. Specifically, contrary to Procedure OPAA1061011006, Operational Decision Making Process, Revision 14, the licensee failed to adequately implement the procedure to ensure the consequences of leaving the emergency governor trip test and lockout switch for the A turbine driven reactor feed pump (TDRFP) in the lockout position were evaluated. This resulted in the loss of the manual trip function for the A TDRFP. The licensee documented the issue in the CAP as AR 02440052. The licensee completed the scheduled maintenance and returned the switch to its normal position. The licensee also revised the surveillance procedure to document the limitations associated with putting the emergency governor trip test and lockout switch in the lockout position. The inspectors determined that the failure to assess the consequences of leaving the switch in the lockout position were evaluated, as required by Procedure OPAA1061011006 was a performance deficiency. Specifically, by not evaluating leaving the emergency governor trip test and lockout switch in the lockout position, the licensee lost the ability to manually trip the A TDRFP. This challenged the operators during the reactor shutdown and nearly resulted in a Level 8 reactor SCRAM. The performance deficiency was more than minor in accordance with IMC 0612, Power Reactor Inspection Reports, Appendix B, Issue Screening, dated September 7, 2012, because, if left uncorrected, the performance deficiency had the potential to lead to a more significant safety concern. The performance deficiency was also associated with the configuration control attribute of the Initiating Events cornerstone and adversely affected the cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown and power operations and is therefore a finding. Using IMC 0609, Attachment 4, Initial Characterization of Findings, and Appendix A, The Significance Determination Process for Findings at Power, issued June 19, 2012, the finding was screened against the Initiating Events cornerstone and determined to be of very low safety significance (Green) because the finding did not cause a reactor trip or the loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition. The inspectors determined this finding affected the cross-cutting area of human performance in the aspect of resources where leaders ensure that personnel, equipment, procedures, and other resources are available and adequate to support nuclear safety. Specifically, the surveillance procedure for the reactor feed pump turbine (RFPT) emergency governor and trip mechanism test incorrectly stated if an actual signal was generated during testing, the lockout valve would de-energize to allow the trip mechanism to operate and trip the RFPT. [H.1] (Section 4OA2) |
| Site: | Clinton  |
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| Report | IR 05000461/2015002 Section 4OA2 |
| Date counted | Jun 30, 2015 (2015Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | S Bell S Mischke W Schaup A Dahbur C Phillips E Sanchez-Santiago J Bozga K Stoedter |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
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Finding - Clinton - IR 05000461/2015002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2015Q2
Self-Identified List (Clinton)
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