05000244/FIN-2015001-01
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Finding | |
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| Title | Inadequate Corrective Actions Result in Failure of Bus 18 Undervoltage Solid State Switchboard Card |
| Description | A self-revealing Green NCV of Title 10 of the Code of Federal Regulations (10 CFR), Appendix B, Criterion XVI, Corrective Action, was identified for failure to establish measures to assure that a condition adverse to quality associated with the availability of the bus 18 solid state switchboard card (SS1) was promptly identified and corrected. Specifically, Ginna did not adequately complete previous corrective actions to ensure carbon resistors in risk significant components were identified and replaced in a timely manner prior to the occurrence of age-related failures, which resulted in the failure of a safety-related bus undervoltage solid state switchboard card and indication of an undervoltage condition. The inspectors determined that the failure to implement corrective actions to identify and correct a condition adverse to quality was a performance deficiency within Exelon Generation Companys, LLC (Exelons) ability to foresee and correct and should have been prevented. Specifically, Exelon failed to adequately execute corrective actions to identify and replace carbon resistors in risk significant components, which resulted in a failure of the bus 18 undervoltage solid state switchboard card. The inspectors determined that the failure to implement corrective actions was more than minor, because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, technical specifications (TSs) require each safeguard bus to have two operable channels of loss of power diesel generator start instrumentation. However, this failure caused one channel to be declared inoperable and resulted in operators entering the TS action statement. Additionally, the bus 18 undervoltage solid state switchboard card failed while in service, incurred unnecessary unavailability hours, provided false indication of an undervoltage condition, and resulted in a maintenance preventable functional failure. The inspectors evaluated the finding using IMC 0609.04, Initial Characterization of Findings. The attachment instructs the inspectors to utilize IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power. The inspectors determined the self-revealing performance deficiency was not a deficiency affecting the design or qualification of a mitigating structure, system, and component; did not represent a loss of system and/or function; and did not represent an actual loss of function of at least a single train. Therefore, the inspectors determined this finding to be of very low safety significance (Green). In accordance with IMC 0612, the finding does not have a cross-cutting aspect, because the performance deficiency occurred more than 3 years ago, would not likely occur today under similar circumstances, and is not reflective of present plant performance. In June 2011, when the performance deficiency occurred, the work planning process did not require the use of formal documentation, and briefings were not required for risk-significant work. However, today documentation and briefings are both required for risk-significant work done in the plant. Additionally, Exelon technicians replaced the failed card, completed an extent of condition review and entered the issue into the CAP. |
| Site: | Ginna  |
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| Report | IR 05000244/2015001 Section 1R12 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | D Dodson D Schroeder E Burket H. Anagnostopoulus N Perry S Horvitz T Fish |
| Violation of: | Technical Specification Technical Specification - Procedures |
| INPO aspect | |
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Finding - Ginna - IR 05000244/2015001 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Ginna) @ 2015Q1
Self-Identified List (Ginna)
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