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| Entered date | Event description | |
|---|---|---|
| ENS 47801 | 3 April 2012 07:36:00 | The Unit 2 DC Cook Nuclear Plant (CNP) Plant Process Computer (PPC) will be removed from service on Tuesday, April 3, 2012 at 0800 EDT to support scheduled maintenance. This will cause the entire Unit 2 PPC, including the ERDS (Emergency Response Data System) to be unavailable to the NRC Operations Center. The planned maintenance also affects the Safety Parameter Display System (SPDS), the Real Time Data Repository (RDR), and PPC data to Emergency Response Facilities at CNP. The scheduled maintenance, returning of equipment to service, and post maintenance testing is expected to be completed by 0000 EDT on Wednesday, April 4, 2012. Compensatory measures exist within the DC Cook Emergency Response procedures to provide plant data via the Emergency Notification System to the NRC Operations Center until the ERDS can be returned to service. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to any event that results in a major loss of emergency assessment capability, offsite response capability, offsite communications capability (e.g. significant portion of control room indication, Emergency Notification System, or offsite notification system).
At time 1500 EDT, the Plant Process Computer and ERDS system has been restored to service. The licensee has notified the NRC Resident Inspector. Notified R3DO (Dickson). |
| ENS 44390 | 7 August 2008 12:13:00 | At 1215 EDT on Thursday, August 7, 2008, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system charcoal filter was removed from service for scheduled preventive maintenance on one of the TSC air conditioning systems. The charcoal bed filtration system is also out of service in support of the maintenance on the air conditioning system. Under certain accident conditions the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. Air conditioning system maintenance is scheduled to complete at 1515 EDT on Thursday, August 7, 2008. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility. The licensee has notified the NRC Resident Inspector.
The TSC air conditioning system was returned to functional status at 16:25 on Thursday, August 7, 2008. This follow up notification is being made to provide closure from the initial notification under 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility. The licensee has notified the NRC Resident Inspector. Notified R3DO (David Hills) |
| ENS 42739 | 30 July 2006 11:15:00 | On July 30, 2006, at 0730, a plant shutdown was initiated in accordance with Technical Specification (TS) Action 3.6.5.B.1. This action requires that the unit be placed in Mode 3 within six hours if containment air temperature is not restored to within limits during the previous eight hours. On July 29, 2006, at 2026 TS Action 3.6.5.A was entered due to containment lower compartment average air temperature exceeding the TS Limiting Condition for Operation 3.6.5.B limit of 120 degrees Fahrenheit. Efforts to reduce the containment temperature during the eight hour completion time of Action 3.6.5.A were unsuccessful. In accordance with normal plant operating procedures, the unit shutdown was completed by initiating a manual reactor trip from 16.5% Reactor Power following a controlled plant shutdown on July 20, 2006, at 1014. All safety systems and plant equipment used in the shutdown functioned as designed. All rods inserted fully without incident. No PORV/safety valves lifted. Decay heat is being removed with AFW. Unit 2 containment air temperature is 117 degrees Fahrenheit. The licensee notified the NRC Resident Inspector. |
| ENS 41233 | 30 November 2004 15:03:00 | A licensed employee was determined to be under the influence of alcohol during a random test. The employee's access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details. The licensee informed the NRC resident operator. |