ENS 46932
ENS Event | |
|---|---|
14:40 Jun 7, 2011 | |
| Title | Fire in the West Switchgear Room |
| Event Description | At 0940 CDT an alert (HA 2, EAL 1) for operating Mode less than 210 degrees F [was] declared for a fire affecting the operability of plant safety systems required to establish or maintain safe shutdown. Time of fire was 0930 CDT. Control room received multiple alarms [and] 480 V bus 1B4A amps were observed to be oscillating. Bus 1B4A was secured [and] buses 1B3A and 1B3A-4A were lost. Halon activated properly. [At] 0956 CDT all notifications to applicable personnel were completed. At 1000 CDT 4160v buses 1A2 / 1A4 were secured to facilitate fire fighting. Spent fuel pool cooling was lost [as a result of the de-energized busses and the licensee] entered AOP-36 for loss of SFP cooling. Heat up rate [was] determined by STA. Current time to boil for SFP is 88.3 hrs. Spent fuel pool cooling is currently back in service. This condition is being reported pursuant to 10 CFR 50.72(a)(1)(i) for declaration of an emergency class specified in the licensee's approved emergency plan.
Plant was in AOP-1 for flood mitigation. The fire is not believed to be flood related. Plant remains in AOP-1. At about 0930 CDT the licensee noted fire in the west switchgear room. The fire brigade responded and found a room filled with smoke but no active fire. Halon did discharge in the room. At 0956 CDT, offsite assistance was called and Blair Fire Department responded to the site. Blair Fire Department confirmed no active fire in the switchgear room. All offsite power remained available as well as the emergency diesel generators if needed. The licensee is currently attempting to ventilate the room. A thorough inspection of the affected area and determine the caused of the electrical fault will be facilitated once the room has been fully ventilated. The licensee has notified appropriate State and local government. The licensee notified the NRC Resident Inspector. A media or press release is also anticipated.
Entered Alert for HA 3, EAL 1 access to a vital area (Switchgear and Turbine Building basement) due to toxic gases present from the fire in the West Switchgear room. The licensee entered HA 3 at 1144 CDT. Their exit criteria is that the switchgear room is cleared for unimpeded access. The licensee has notified the NRC Resident Inspector. Notified the R4IRC (Kennedy)
At 1315 CDT, Fort Calhoun Nuclear Station has exited Alert HA 2, EAL. It has been confirmed that no fire remained in the vital area. Plant shutdown cooling remained in-service and spent fuel pool cooling was restored and temperature verified to be lowering. The licensee has also exited Alert HA 3, EAL 1 after it was confirmed that the environmental conditions from the event and associated Halon discharge does not affect the ability to safely operate or safely shutdown the reactor due to being in Mode 5 and shutdown cooling remaining in-service. Fort Calhoun remains in Unusual Event HU 1, EAL 5 for River Level greater than 1004' elevation as reported under EN #46929. The licensee has notified appropriate State and local government. The licensee has also notified the NRC Resident Inspector. The NRC made notifications of the event termination to DHS, FEMA, DOE HHS and USDA. |
| Where | |
|---|---|
Fort Calhoun  Nebraska (NRC Region 4) | |
| Reporting | |
| Emergency class: | Alert |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-3.32 h-0.138 days <br />-0.0198 weeks <br />-0.00455 months <br />) | |
| Opened: | Robert Kros 11:21 Jun 7, 2011 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Jun 7, 2011 |
| 46932 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 514392015-10-02T14:05:0002 October 2015 14:05:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event ENS 492412013-08-06T12:22:0006 August 2013 12:22:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to High Winds ENS 470512011-07-15T00:13:00015 July 2011 00:13:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Suspected Introduction of Contraband Into the Protected Area ENS 469322011-06-07T14:40:0007 June 2011 14:40:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Fire in the West Switchgear Room ENS 469292011-06-06T13:00:0006 June 2011 13:00:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unusual Event Declared Due to River Level ENS 464902010-12-19T06:08:00019 December 2010 06:08:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Quickly Concluded Notice of Unusual Event Due to a Loss of Communications ENS 448512009-02-13T21:26:00013 February 2009 21:26:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event - Engineering Analysis Requires Technical Specification Shutdown ENS 436362007-09-13T10:01:00013 September 2007 10:01:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event for a Hydrazine Spill in the Turbine Building ENS 401942003-09-23T18:20:00023 September 2003 18:20:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event ENS 401652003-09-17T13:43:00017 September 2003 13:43:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Post Alert Emergency Declaration Based on Calculated Rcs Inventory Loss 2015-10-02T14:05:00 | |