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On February 26, 2013, during the Unit 1 re … 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 1 Under Vessel Leak Source Not Identified

Discovered date

23:59:59, 31 March 2013 +

Docket

05000321 + and 05000366 +

Event date

23:59:59, 31 March 2013 +

Finding

05000321/FIN-2013002-02 +

Finding integer

2 +

Finding type

Non-cited violation +

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DM.2 +

IR 05000321/2013002 +

Inspector

Frank Ehrhardt +, J Laughlin +, J Sowa +, A Nielson +, R Hamilton +, E Morris +, L Lake +, D Hardageb +, Caballerod Hardage +, Phil Niebaum + and Carmen Dykes +

Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.

00:48:21, 21 February 2018 +

Person