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| Entered date | Event description | |
|---|---|---|
| ENS 54239 | 25 August 2019 15:51:00 | On August 25, 2019, at 1102 (CDT), Quad Cities Unit 1 experienced an automatic scram from 100 percent power. All rods fully inserted and there were no complications. The trip was initiated from a main generator ground fault relay. Troubleshooting of the fault is in progress. All systems responded as designed. There were no systems inoperable and no TS (Technical Specification) action statements were in progress prior to the Reactor Scram. Reactor water level dropped below the Group 2 and Group 3 Reactor Water Level Isolation set-points as expected, and recovered via the Feedwater system. Standby Gas Treatment System auto started and Reactor Building Ventilation Isolation occurred as expected. Unit 1 remains in Mode 3. Decay heat is being removed using the steam bypass valves to the condenser and the safety relief valves did not lift as a result of the trip. This report is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A). The NRC Resident Inspector has been notified. Unit 2 was not affected. |
| ENS 52127 | 26 July 2016 18:12:00 | On July 26, 2016 at 1252 hours (CDT), the Control Room Emergency Ventilation (CREV) system was declared inoperable due to a toxic gas analyzer spurious alarm which resulted in the 'B' Air Filtration Unit (AFU) being inadvertently isolated. In this condition, Control Room Emergency Ventilation (CREV) system cannot be guaranteed to achieve required design flow rate. Tech Spec 3.7.4, Condition A was entered which requires the CREV system to be restored to an operable status in seven (7) days. The CREV system maintains a habitable control room environment and ensures the operability of components in the control room emergency zone during accident conditions as well as protection of the operators from a high dose environment assumed during a design basis accident. This notification is being made in accordance with 10 CFR 50.72(b)(3)(v)(D), 'Event or Condition That Could Have Prevented Fulfillment of a Safety Function,' because the CREV system is a single train system required to mitigate the consequences of an accident. The NRC Resident Inspector has been notified. |