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Nuclear Event | Plant Shutdown – Degraded Condition: North Anna Nuclear Generating Station, Virginia

2016/08/01

North America – USA | State of Virginia, Mineral, North Anna Nuclear Power Station
Location: 38°03’38.0″N 77°47’22.0″W
Present Operational Age: ~38 years
Event: PLANT S/D REQD BY TS – DEGRADED CONDITION

Nuclear Event in USA on Saturday, 30 July, 2016 at 11:52 [EDT].

TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO UNISOLABLE REACTOR COOLANT SYSTEM BOUNDARY LEAKAGE

“On July 30, 2016 at 1152 hours [EDT] following a containment walkdown to investigate an increase in RCS unidentified leakage to 0.15 gpm, a leak was identified on the seal return line from 2-RC-P-1C, ‘C’ Reactor Coolant Pump. The source of the leakage cannot be isolated and is considered RCS pressure boundary leakage. [Technical Specification] LCO 3.4.13, RCS Operational Leakage, Condition B for the existence of pressure boundary leakage was entered. Technical Requirement TR 3.4.6, ASME Code Class 1, 2, and 3 Components is also applicable. Unit 2 is projected to be taken to Mode 5 for repair.

“This event is reportable in accordance with 10 CFR 50.72(b)(2) for ‘the initiation of any nuclear plant shutdown required by the plant’s Technical Specifications’ and 10 CFR 50.72(b)(3)(ii)(A) for ‘any event or condition that results in the condition of the nuclear plant including its principal safety barriers, being seriously degraded.'”

The licensee will be notifying the Louisa County Administrator and has notified the NRC Resident Inspector.

Source: NRC  Event Number: 52137


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