05000397/FIN-2011008-03
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Finding | |
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| Title | Failure to Verify Control Rod Drive System Lineup |
| Description | The team documented a Green self-revealing violation of Technical Specification 5.4.1(a), because operators failed follow the control rod drive scram testing procedure, in that they failed to verify that no conflicting activities were in progress. Consequently, control rods were moving much faster than normal because the control rod drive exhaust system header was vented. In addition, plant operators had failed to follow operational performance standards in that they failed to know the plant status at all times and they proceeded with the surveillance when they were not aware of the expected results. Further, once the control rod behavior was clearly outside the expected norms, operators associated the unusual performance to inappropriate causes and continued to test additional control rods. The licensee entered the finding into their corrective action program as Action Request 248171. The finding was more than minor because it affected the configuration control 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. Operation of the control rod drive system with the exhaust header vented could cause damage. Further, control rods withdrawing faster than the normal under certain power configuration could challenge fuel integrity. The inspectors used NRC Inspection Manual 0609, Appendix G, Shutdown Operations Significance Determination Process, to evaluate the significance of the finding. The finding did not require a quantitative assessment because adequate mitigating equipment remained available and the finding did not constitute a loss of control, as defined in Appendix G. Therefore, the finding screened as Green. The finding had a crosscutting aspect in the area of human performance associated with Work Practices because operators failed to properly utilize human error prevention techniques such as holding pre-job briefings as well as self and peer checking. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2011008 Section 4OA3 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | G Replogle W Walker G Apger J Groom M Hayes C Henderson |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Columbia - IR 05000397/2011008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2011Q4
Self-Identified List (Columbia)
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