05000397/FIN-2012005-05
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Finding | |
|---|---|
| Title | Failure to Follow Shutdown Cooling Isolation Logic Bypass Procedures Results in Loss of Safety Function |
| Description | The inspectors identified a non-cited violation of Technical Specification 5.4.1.a, Procedures, for the licensees human performance associated with operation of the residual heat removal system shutdown cooling isolation logic. On October 1, 2012, following a review of Action Request 270846, the inspectors identified 29 examples where the licensee disabled both divisions of the low reactor vessel water level (Level 3) isolation logic for the shutdown cooling isolation valves RHR-V-8 and RHR-V-9, contrary to station procedures. This issue was entered into the licensees corrective action program as Action Request 271826. This performance deficiency was more than minor because it adversely affected configuration control attribute of the Barrier Integrity Cornerstone objective to ensure that physical design barriers protect the public from radionuclide releases caused by accidents or events. The senior resident inspector performed the initial significance determination for the finding using the NRC Inspection Manual 0609, Appendix G, Shutdown Operations Significance Determination Process. Using Checklist 7, BWR Refueling operations with RCS Level > 23 Feet, the finding required a Phase 2 quantitative assessment because the automatic isolation function of the decay heat removal system (on low vessel level) was not operable. A Region IV senior reactor analyst performed a modified Phase 2 analysis and determined the finding was of very low safety significance. The inspectors determined that this finding had a cross-cutting aspect in the area of human performance associated with the decision making component because the licensee failed to use a systematic process when not following the procedural requirements associated with the residual heat removal shutdown cooling system. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2012005 Section 4OA2 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | W Walker J Laughlin J Groom M Hayes C Henderson |
| CCA | H.13, Consistent Process |
| INPO aspect | DM.1 |
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Finding - Columbia - IR 05000397/2012005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2012Q4
Self-Identified List (Columbia)
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