ENS 50038
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ENS Event | |
|---|---|
20:15 Apr 15, 2014 | |
| Title | Technical Specification Required Shutdown Due to Failure of Control Room Air Conditioning |
| Event Description | At 1505 CDT the 'A' control room air conditioner (VA-46A) trouble alarm annunciated in the control room. The unit was confirmed to be not functioning properly and was declared inoperable at time 1515 [CDT]. The 'B' control room air conditioner (VA-46B) was previously declared inoperable due to maintenance. With both control room air conditioners inoperable the plant entered technical specification 2.0.1, a 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> shutdown action statement. Repairs to the 'B' had been previously planned and are in progress to allow the unit to be returned to service as soon as possible. Troubleshooting and subsequent repairs to the 'A' unit are in progress. At 1812 [CDT], the station commenced a shutdown to comply with the required action statement.
The NRC Resident Inspector has been informed.
At time 2050 [CDT], VA-46A was declared operable based on installation of an emergency temporary modification. TS 2.0.1 has been exited. Shutdown has been secured and FCS is stable at a nominal 33% power. The licensee notified the NRC Resident Inspector. Notified the R4DO (Gaddy). |
| Where | |
|---|---|
| Fort Calhoun Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-0.98 h-0.0408 days <br />-0.00583 weeks <br />-0.00134 months <br />) | |
| Opened: | Michael Peak 19:16 Apr 15, 2014 |
| NRC Officer: | Charles Teal |
| Last Updated: | Apr 15, 2014 |
| 50038 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 502142014-06-20T05:01:00020 June 2014 05:01:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 500382014-04-15T20:15:00015 April 2014 20:15:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Failure of Control Room Air Conditioning ENS 497042014-01-09T11:18:0009 January 2014 11:18:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Inoperable Raw Water Pumps. ENS 463682010-10-27T17:22:00027 October 2010 17:22:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unit Commenced Shutdown After Declaring Containment Spray Inoperable ENS 458282010-04-08T21:22:0008 April 2010 21:22:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Inoperable Steam Generator Inlet Isolation Valve 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 424862006-04-10T15:55:00010 April 2006 15:55:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Personnel Air Lock Door Equalizing Valve Leaking by 2014-06-20T05:01:00 | |
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