Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 46936 | 8 June 2011 12:08:00 | Flushing activities were in progress on the 2A Auxiliary Feedwater (AF) Pump suction line from the Essential Service Water System (SX). At 1011 (CDT), during this flushing activity, the flushing hose ruptured and caused flooding in the Auxiliary Building that had the potential to affect safety related equipment needed for the current operating mode. This was due to the flood waters contacting the motors of the 1A and 2A AF Pumps. At 1026, an Unusual Event was declared by the Shift Emergency Director because the conditions for EAL entry were met for EAL HU5. Specifically the EAL conditions were 'Flooding in the Auxiliary Building that has the potential to affect safety related equipment needed for the current operating mode.' Auxiliary Feedwater is required to be operable in Mode 1 for each unit. The leak was immediately isolated (within 45 seconds of hose rupture) and remains isolated. Maintenance personnel are in the process of testing the 1A and 2A AF Pump motor to determine operability. The appropriate Tech Spec Action Statements have been entered on each Unit for the AF Pumps. The leak also caused the wetting of MCC (Motor Control Center) 132X1, which feeds the 1B AF Pump control power. The Unit 0 (Common) Component Cooling Pump feed breaker cubicle was also wetted. Investigation into these components are also in progress. The licensee has entered Technical Specification LCO 3.7.5 Condition A which requires restoration of the one of the AF pumps within 72 hrs. There were no personnel injuries. The licensee has notified the NRC Resident Inspector.
At 1122 (CDT) on 6/8/11, the Unusual Event was terminated due to the flooding conditions no longer existing. Evaluation of wetted components are still in progress. The NRC Resident Inspector has been notified of event. Notified IRD (Gott), R3DO (Lara), NRR EO (Thorp), FEMA (Blankenship), and DHS (Flinter). |
| ENS 46694 | 24 March 2011 11:39:00 | During a planned maintenance activity on the Unit 2 main control room alarm cabinets, it was identified that all Unit 2 safety system annunciators were lost. This was identified at 1006 (CDT). Main Control Board indicators remained functional. At 1018 (CDT), the Shift Manager declared an Unusual Event under Emergency Action Level MU6. This was due to an unplanned loss of most (approximately 75%) safety system annunciators for > 15 minutes. The planned maintenance activity was not expected to affect the amount of annunciators that were lost. At 1030 (CST), the (planned maintenance) clearance order was cleared and power was restored to the Unit 2 annunciators. There was not transient on other plant equipment and the plant remained stable before and after this event. The cause for the unexpected loss of annunciators is not clearly understood and is still under investigation. The licensee notified the NRC Resident Inspector.
The Unusual Event was terminated at 1047 CDT on 03/24/11. All annunciators have been restored and an investigation will be conducted to determine the cause. Notified R3DO (Cameron) |
| ENS 46549 | 18 January 2011 15:19:00 | A non-licensed employee supervisor has a confirmed positive test for an illegal drug during a random fitness for duty test. The employees access to the plant has been cancelled. Contact the Headquarters Operations Officer for more details. The NRC Resident Inspector has been notified. |
| ENS 45161 | 24 June 2009 19:02:00 | At 1639 CDT on 6/24/09, it was discovered that a fish kill took place in the Braidwood Station's cooling lake due to increased temperature. As summer air temperature increased, the cooling lake temperature increased above 93 degrees F, the threshold at which species susceptible to increased temperature begin to perish. It was communicated to the Illinois Department of Natural Resources (IDNR) that a fish kill has occurred. This notification is being made in accordance with the Exelon Reportability Manual section SAF 1.9, Braidwood Station Facility Operating License Appendix B Section 4.1,'Unusual or Important Environmental Events', and 10CFR50.72(b)(2)(xi). See also EN #45151 for similar event. The licensee notified the NRC Resident Inspector. |