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Nuclear Event – Potential Uncontrolled Radiation Release: LaSalle County Nuclear Generating Station, Unit 1 & 2, Illinois

2016/02/11

Technological Hazard –  Potential Uncontrolled Radiation Release

North America – USA | State of Illinois – LaSalle County Station, Unit 1 & 2
Location: 41°14’44.0″N 88°40’09.0″W
Present Operational Age: ~32 years
Event: POT UNCNTRL RAD REL – ACCIDENT MITIGATION

SECONDARY CONTAINMENT INOPERABLE

“This report is being made pursuant to 10CFR50.72(b)(3)(v)(C), event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material and 10CFR50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequences of an accident. LaSalle Station’s Unit 1 and Unit 2 were in Mode 1. At 2207 [CST] [on 2/10/16], Secondary Containment Differential Pressure dropped below the Technical Specification (TS) 3.6.4.1 minimum of 0.25 inches water vacuum. The initial indications are a failure of one Unit 1 Reactor Building Exhaust Isolation Damper, which resulted in a trip of the Unit 1 Reactor Building Exhaust Fans. At 2245, Secondary Containment Differential Pressure was restored to within the TS 3.6.4.1 limits by securing and isolating the Unit 1 Reactor Building Ventilation System. Troubleshooting plans are being developed to determine cause of the damper failure and to correct the deficient condition.”

The licensee has notified the NRC Resident Inspector.

Source: NRC Event Number: 51725

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