05000382/FIN-2013008-01
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Finding | |
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| Title | Failure to Establish an Adequate Test Program to Demonstrate that the Train B Emergency Diesel Generator Exhaust Fan Would Perform Satisfactorily In Service |
| Description | A self-revealing apparent violation of 10 CFR Part 50, Appendix B, Criteria XI, Test Control, occurred because the licensee failed to establish an adequate test program to demonstrate that a safety-related component associated with the train B emergency diesel generator would perform satisfactorily in service. Specifically, the licensee failed to identify and perform adequate testing on the train B emergency diesel generator exhaust fan to demonstrate that the exhaust fan would perform satisfactorily in service. The test did not incorporate requirements and acceptance limits contained in applicable design documents such as the Final Safety Analysis Report, as updated. As a result, the licensee failed to ensure that for all operational tests that the safety-related exhaust fan would perform satisfactorily such that it would provide sufficient flow and remove heat during accident conditions. The licensee entered this condition into its corrective action program as Condition Report CR-WF3-2013-02530. The immediate corrective actions taken to restore compliance included the replacement of the train B emergency diesel generator exhaust fan assembly. The planned corrective actions included the review of the emergency diesel generator ventilation system monitoring plan. The failure to identify and perform testing to demonstrate that a safety-related component would perform satisfactorily in service in accordance with requirements contained in applicable design documents was a performance deficiency. The performance deficiency was more than minor because it was associated with the equipment performance attribute of the mitigating systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors performed the initial significance determination for the diesel generator room ventilation fan failure. The inspectors used the NRC Inspection Manual 0609, Attachment 4, Initial Characterization of Findings. The finding required a detailed risk evaluation because it involved a potential loss of one train of safety-related equipment for longer than the technical specification allowed outage time. The emergency diesel generator needed the ventilation exhaust fan to remain operable. The unit was not recoverable. The total exposure period was 25 days. The allowed outage time was 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The analyst determined the best estimated change to the core damage frequency was 4.4E-6/year. This finding was preliminarily characterized as low to moderate safety significance (White). The dominant core damage sequences included loss of offsite power events, leading to station blackout, coincident with the failure of the turbine driven auxiliary feedwater pump. Equipment that helped to mitigate the risk included recovery of an emergency diesel generator or manually starting a temporary emergency diesel generator set. The inspectors concluded that the finding reflected current licensee performance and involved a cross-cutting aspect in the resource component of the human performance area in that the licensee did not have complete, accurate and up-to-date operational surveillance test procedure. |
| Site: | Waterford  |
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| Report | IR 05000382/2013008 Section 1R22 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | Violation: White |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | C Speer G Replogle G Werner K Kennedy M Davis R Azuat Farinat Pruettc Youngt Pruettc Sandersj Clark K Kennedy L Casey M Dapas |
| Violation of: | Technical Specification - Procedures Technical Specification 10 CFR 50 Appendix B Criterion XI |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Waterford - IR 05000382/2013008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Waterford) @ 2013Q4
Self-Identified List (Waterford)
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