05000321/FIN-2013005-02
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Finding | |
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| Title | Failure to Promptly Identify Source of Leakage Under Unit 1 Reactor Vessel |
| Description | NRC inspectors identified a non-cited violation (NCV) of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, for the licensees failure to promptly identify the source of leakage under Unit 1 reactor vessel on February 26, 2013. On October 25, 2013, the licensee identified the source of under vessel leakage to be from two bolts on a control rod drive mechanism to restore compliance. This violation was entered into the licensees corrective action program as condition report (CR) 723942. The failure to promptly identify leakage from control rod drive mechanism 06-35 on February 26, 2013, as required by 10 CFR 50 Appendix B, Criterion XVI, Corrective Actions, was a performance deficiency. This performance deficiency affected the initiating events cornerstone and was determined to be more-than-minor because, if left uncorrected, failure to identify the location of leakage sources within the drywell has the potential to lead to a worse leak and a more significant safety concern. The inspectors screened this finding utilizing IMC 0609 Attachment 4, Initial Characterization of Findings, dated June 19, 2012. The finding screened as Green using the initiating events loss of coolant accident initiator screening questions because the finding degradation assessment did not result in exceeding the reactor coolant system leak rate for a small loss of coolant accident and did not affect the functions of other systems used to mitigate a loss of coolant accident. The inspectors determined this performance deficiency had a cross cutting aspect in the human performance area decision-making attribute because the licensee did not use conservative assumptions in decision making by demonstrating that a condition adverse to quality was identified or did not exist in order to proceed with plant startup. |
| Site: | Hatch  |
|---|---|
| Report | IR 05000321/2013005 Section 1R20 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | B Caballero D Hardage E Morris F Ehrhardt J Laughlin P Niebaum |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Hatch - IR 05000321/2013005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Hatch) @ 2013Q4
Self-Identified List (Hatch)
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