Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 45653 | 25 January 2010 09:09:00 | At 0930 on Monday, January 25, 2010, the Cook Nuclear Plant (CNP) Unit 1 Plant Process Computer (PPC) will be removed from service for scheduled maintenance which will take the Emergency Response Data System (ERDS) out of service. The scheduled maintenance is planned from 0930 hours EST until 1530 hours EST. Personnel will be performing computer system backups and maintenance. Compensatory measures exist within the CNP Emergency Response procedure to provide plant data via the Emergency Notification System 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 NUREG 1022 Revision 2 for CFR 50.72(b)(3)(xiii) due to any event that results in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability (e.g., significant portion of control room indication, Emergency Notification System, or offsite notification system).
The Unit 1 Plant Process Computer and the Emergency Response Data System (ERDS) were returned to functional Status at 11:35 on Monday, January 25, 2010. This follow up notification is being made to provide closure from the initial notification under CFR 50.72 (b)(3)(xiii) due to any event that results in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability (e.g., significant portion of control room indication, Emergency Notification System, or offsite notification system). The NRC Resident Inspector has been notified. Notified R3DO(Lipa) |
| ENS 45454 | 21 October 2009 23:39:00 | At 0001 on Thursday, October 22, 2009, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system air conditioning and filtration systems will be removed from service for a scheduled maintenance activity. The Motor Control Center providing electrical power to several TSC ventilation components will be de-energized to facilitate replacement of the U1 CD Emergency Diesel Generator room ventilation supply fan starter (1-88X-DGS-2). 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. The TSC ventilation system availability is scheduled to be restored at 0800 on Thursday, October 22, 2009. The licensee has notified the NRC Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the unavailability of an emergency response facility.
The TSC ventilation was restored to service at 0937 EDT. The licensee will notify the NRC Resident Inspector. Notified the R3DO (Kozak). |
| ENS 43956 | 2 February 2008 07:44:00 | The DC Cook Unit 1 Reactor was manually tripped from 93% power due to high vibrations on main turbine bearings #5 and 6. This event is reportable under 10CFR50.72(b)(2)(iv)(B), RPS actuation, as a four (4) hour report and under 10CFR50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report. Preliminary evaluation indicates all plant systems functioned normally following the Reactor Trip. DC Cook Unit 1 remains stable in Mode 3 while conducting the post Trip Review. No radioactive release is in progress as a result of this event. The DC Cook Resident NRC Inspector was notified 02/02/08 at approximately 0535 EST. The electrical grid is stable and Unit 1 is being supplied by offsite power. Unit 2 is not affected. All control rods fully inserted. Decay heat is being removed via steam dumps to the main condenser. |