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| Entered date | Event description | |
|---|---|---|
| ENS 48527 | 20 November 2012 18:27:00 | At 1321 (CST) hours on November 20, 2012, the 1B Drywell Radiation Monitor exhibited degraded performance at the conclusion of surveillance testing. This monitor provides the input into one division of the primary containment isolation logic for a Group II isolation. As a result, the channel was placed in a tripped condition in accordance with Technical Specification 3.3.6.1, Condition B. Given both divisions are required to complete the Group II isolation logic, this condition is reportable in accordance with 10 CFR 50.72(b)(3)(v)(C) as an event or condition that could have prevented the fulfillment of a safety function. The station is currently taking action to troubleshoot and restore the 1B Drywell Radiation Monitor to an operable condition. The NRC Resident Inspector has been notified.
ENS Retraction - Drywell Radiation Monitor Inoperable The purpose of this notification is to retract the ENS Report made on November 20, 2012, at 1827 EST hours (ENS Report # 48527). Further evaluation performed by Quad Cities Station confirms the 1B Drywell Radiation Monitor would have performed its safety function when required. Based on this subsequent evaluation, ENS Report # 48527 is being retracted. Note: On November 21, 2012, the 1B Drywell Radiation Monitor was successfully repaired and returned to Operable status. The licensee informed the NRC Resident Inspector. Notified R3DO (Bloomer). |
| ENS 48114 | 17 July 2012 17:36:00 | On July 17, 2012, at 1120 hours the Control Room Emergency Ventilation Air Conditioning (CREV AC) system was declared inoperable due to a cooling water leak from the condenser on the Refrigeration Compressor Unit (RCU). The leakage originates from an apparent gasket leak at a bolted connection on the condenser. As a result, Technical Specification 3.7.5, Condition A, was entered. A repair plan and schedule is being developed. The CREV AC system maintains a habitable control room environment and ensures the operability of components in the control room emergency zone during accident conditions. This notification is being made in accordance with 10 CFR 50.72(b)(3)(v)(D) because the CREV system is a single train system, and loss of the CREV AC could impact the plant's ability to mitigate the consequences of an accident. The licensee has notified the NRC Resident Inspector.
The licensee is retracting this report based on the following: The purpose of this notification is to retract the ENS Report made on July 17, 2012, at 1120 hours (ENS Report # 48114). Further evaluation performed by Quad Cities Station confirms the CREV AC system would have performed its safety function. Based on this subsequent evaluation, ENS Report # 48114 is being retracted. Note: On July 18, 2012, the CREV AC system was successfully repaired and CREV AC system was returned to Operable status. The licensee informed the NRC Resident Inspector. Notified R3DO (Giessner). |