05000321/FIN-2013002-02
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Finding | |
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| Title | Unit 1 Under Vessel Leak Source Not Identified |
| Description | On February 26, 2013, during the Unit 1 reactor coolant system 920 psig normal operating temperature primary containment drywell walkdown, licensee personnel discovered a 15 drop-per-minute water leak under the reactor vessel. At the time of the discovery, personnel within the drywell were unable to go under Unit 1 reactor vessel to identify the source of the leak because they did not meet radiological work permit dress requirements for going under vessel. The leak description was reported to the sites Outage Command Center and CR 596805 was initiated. CR 596805 documented that the leak was accepted by management. Justification for accepting the leak is documented in technical evaluation 596805, which states in part No steam leaks were visible, no sounds of leakage were heard, through indirect observation the water appeared to be cold. The drywell atmosphere consisted of humid air and due to the drywell cooler discharging in the area, it appeared to be condensation. Based on his judgment, it did not appear to the individual performing the walkdown to be pressure boundary leakage. Hatch Unit 1 Technical Specification 3.4.4, Reactor Coolant System Operational Leakage, limits reactor coolant system leakage to no pressure boundary leakage. 10 CFR 50, Appendix B, Criterion XVI, Corrective Actions, requires in part that measures shall be established to assure that conditions adverse to quality are promptly identified. Because the licensee accepted the leak without determining the source, the inspectors need more information to determine if the abnormal condition (leak identified under Unit 1 reactor vessel) constitutes a violation of Technical Specification 3.4.4 for pressure boundary leakage, and/or a violation of 10 CFR 50 Appendix B, Criterion XVI, for not promptly identifying a condition adverse to quality. To resolve this URI inspection of Unit 1 primary containment drywell is required to identify the source of the leak described in CR 596805. URI 05000321/2013002-02, Unit 1 Under Vessel Leak Source Not Identified |
| Site: | Hatch  |
|---|---|
| Report | IR 05000321/2013002 Section 1R20 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | F Ehrhardt R Hamilton L Lake E Morris A Nielson J Sowa C Dykes D Hardageb Caballerod Hardage E Morris F Ehrhardt J Laughlin P Niebaum |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI Technical Specification |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Hatch - IR 05000321/2013002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Hatch) @ 2013Q1
Self-Identified List (Hatch)
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