05000458/FIN-2012005-04
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Finding | |
|---|---|
| Title | Failure to Follow Procedure for Lifting Leads Results in Inoperability of Standby Service Water Fan |
| Description | The inspectors reviewed a self-revealing, non-cited violation of Technical Specification 5.4.1.a due to a failure to follow work order instructions. Specifically, station personnel failed to follow the requirements of Procedure GMP-0042, Lifted Leads and Jumpers, Revision 13 when removing and reinstalling a time-delay relay for a standby service water cooling fan. This issue was entered into the licensees corrective action program as Condition Report CR-RBS-2012-06325. The failure to follow work order instructions is a performance deficiency. This performance deficiency is more-than-minor because it is associated with the equipment reliability attribute of the mitigating systems cornerstone to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to ensure the correct wiring to the standby service water fan time-delay relay resulted in the inability of the fan to be started locally, which is required for remote shutdown of the plant. In accordance with NRC Inspection Manual Chapter 0609, Attachment 4, Initial Characterization of Findings, and NRC Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process for Findings At Power, Exhibit 2, Section A, question 3, this finding required a detailed risk evaluation because the finding represented an actual loss of function of at least a single train for greater than the technical specification allowed outage time. The risk of the condition was evaluated by a senior reactor analyst. The sequence that would result in a risk increase is control room abandonment with concurrent maintenance being performed on the alternate bank of 5 fans. This would leave only 4 functional fans in one division of standby service water, whereas 5 fans are needed per design to meet the safety function. The frequency of control room abandonment is approximately 5E-5/yr and the frequency of maintenance performed on one bank of standby service water fans is approximately 1E-2. Therefore, the frequency of a scenario where the failure of one fan to operate from the alternate shutdown panel would cause a measurable effect on risk is approximately 5E-7/yr. The other division of standby service water fans was unaffected by this condition. Accordingly, the significance of the performance deficiency was determined to be very low (Green). This finding has a human performance cross-cutting aspect associated with the work practices component in that the electricians failed to use adequate human error prevention techniques |
| Site: | River Bend  |
|---|---|
| Report | IR 05000458/2012005 Section 4OA3 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | A Barrett J Laughlin G Larkin D Proulx |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - River Bend - IR 05000458/2012005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2012Q4
Self-Identified List (River Bend)
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