05000316/FIN-2012008-05
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Finding | |
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| Title | Inadequate Procedure for Responding to a MODE 4 LOCA |
| Description | The inspectors identified a finding of very low safety significance and associated Non-Cited Violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, for the failure to include adequate venting instructions in the procedure use to respond to a MODE 4 loss-of-coolant accident. Specifically, the procedure did not include instructions to address all of the affected residual heat removal system high points, including the discharge piping. The finding was entered into the licensees corrective action program to leave one train of the system idle while the other train cools down the reactor coolant system below 200F to ensure that the discharge side of one train of residual heat removal system is not vulnerable to steam formation. The performance deficiency was determined to be more than minor because, if left uncorrected, it would have the potential to lead to a more significant safety concern. The finding screened as of very low safety significance (Green) using a Phase II evaluation. The inspectors determined that this finding had a cross-cutting aspect in the area of problem identification and resolution because the licensee did not thoroughly evaluate relevant external operating experience. Specifically, the licensees evaluation of Information Notice 2010-11 incorrectly concluded that procedures contained sufficient direction to preclude flashing. |
| Site: | Cook  |
|---|---|
| Report | IR 05000316/2012008 Section 4OA5 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Tilton N Feliz _Adorn |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Cook - IR 05000316/2012008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2012Q3
Self-Identified List (Cook)
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