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Nuclear Event – Potential Uncontrolled Radiation Release: Millstone Nuclear Power Plant, Connecticut

2016/04/11

North America – USA | State of Connecticut, Millstone Nuclear Power Plant [Unit 3]
Location: 41°18’43.0″N 72°10’07.0″W
Present Operational Age: ~30 years
Event: POT UNCNTRL RAD REL/ACCIDENT MITIGATION

Nuclear Event in USA on Saturday, 09 April, 2016 at 15:23 [EDT].

SECONDARY CONTAINMENT DETERMINED TO BE INOPERABLE DURING SURVEILLANCE TESTING

“During pre-planned surveillance testing of the Supplementary Leak Collection and Release System (SLCRS), an issue was found affecting the Secondary Containment boundary. Millstone Unit 3 is being moved to Mode 5 for a refuel outage where investigation and repairs will be made. This is reportable under 10CFR50.72(b)(3)(v)(C), a condition that could have prevented the fulfillment of a safety function for systems or structures to control the release of radioactive material, and 10CFR50.72(b)(3)(v)(D) to mitigate the consequences of an accident.”

The surveillance testing was being performed while Millstone 3 was being removed from service for an upcoming Refueling Outage.

The licensee has notified the NRC Resident Inspector and State and Local authorities.

Source: NRC  Event Number: 51860
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