ENS 49448
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ENS Event | |
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17:11 Oct 18, 2013 | |
Title | Technical Specification Required Shutdown Due to Loss of Cooling to Switchgear Rooms |
Event Description | Wolf Creek has commenced a plant shutdown in accordance with Technical Specifications. The A train class 1E electrical equipment air conditioning unit was declared non-functional due to a possible failed oil pressure sensor. This failure could prevent the [AC] unit from performing its required function over its required mission time, as required by Technical Specifications 3.8.4, 3.8.7, and 3.8.9. The following safety related electrical equipment was declared inoperable: 4.16KV bus NB01; 480 volt AC buses NG01 and NG03; 120 volt instrument AC inverters and buses NN11, NN13, NN01 and NN03; 125 VDC chargers and buses NK11, NK13, NK01 and NK03.
Technical Specification 3.0.3 was entered at 1141 CDT on 10/18/2013 from Technical Specification 3.8.7 due to two out of four 120 VAC inverters (NN11 and NN13) being inoperable. Plant shutdown to Mode 5 commenced at 1211 CDT. All electrical systems listed above remain available but are declared inoperable due to inadequate room cooling capability. No major equipment is out of service. No switchgear room temperature limits were challenged. The NRC Resident Inspector has been notified. See event notifications; EN #49339, EN #49126, and EN #49008 for similar events. |
Where | |
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Wolf Creek ![]() Kansas (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
Time - Person (Reporting Time:+-3.4 h-0.142 days <br />-0.0202 weeks <br />-0.00466 months <br />) | |
Opened: | Jeff Isch 13:47 Oct 18, 2013 |
NRC Officer: | John Shoemaker |
Last Updated: | Oct 18, 2013 |
49448 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (80 %) |
WEEKMONTHYEARENS 545082020-02-02T00:45:0002 February 2020 00:45:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown Due to Containment Purge Valve Excessive Leakage ENS 522182016-09-02T13:08:0002 September 2016 13:08:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 510742015-05-16T02:48:00016 May 2015 02:48:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to 2 Ac Inverters Inoperable ENS 510712015-05-15T09:36:00015 May 2015 09:36:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to 2 Ac Inverters Inoperable ENS 494482013-10-18T17:11:00018 October 2013 17:11:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Loss of Cooling to Switchgear Rooms ENS 493392013-09-11T22:31:00011 September 2013 22:31:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Loss of Cooling to Switchgear Rooms ENS 491262013-06-17T16:11:00017 June 2013 16:11:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Non-Functional Class 1E Electrical A/C Unit ENS 490082013-05-06T22:33:0006 May 2013 22:33:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown Required Due to Non-Functional Class 1E Air Conditioning Unit ENS 479982012-06-06T08:27:0006 June 2012 08:27:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Inadequate Cooling Available to Support Electrical Power Systems ENS 471542011-08-15T15:55:00015 August 2011 15:55:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown - Contaminated Oil Sample ENS 464572010-12-06T10:18:0006 December 2010 10:18:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Exceeding Allowed Outage Time on the 'A' Emergency Diesel Generator ENS 463092010-10-05T03:00:0005 October 2010 03:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 461982010-08-23T13:14:00023 August 2010 13:14:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Both Edgs and an Rhr Loop Inoperable ENS 459852010-06-07T23:44:0007 June 2010 23:44:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Voiding in the Component Cooling Water System ENS 456632010-01-26T21:25:00026 January 2010 21:25:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Entry Into Technical Specification Required Shutdown ENS 439852008-02-14T00:50:00014 February 2008 00:50:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification 3.0.3 Required Shutdown ENS 438952008-01-11T22:22:00011 January 2008 22:22:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech. Spec. Required Shutdown Due to Gas Voiding in Discharge Piping ENS 420042005-09-21T03:40:00021 September 2005 03:40:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Commenced Due to Inoperability of Residual Heat Removal Containment Sump Isolation Valves 2020-02-02T00:45:00 | |
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