ENS 49222
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ENS Event | |
|---|---|
14:42 Jul 29, 2013 | |
| Title | Fire Related Unanalyzed Condition That Could Impact Credited Safe Shutdown Analysis |
| Event Description | This is a non-emergency notification. In preparation for converting from 10 CFR 50. Appendix R, to NFPA (National Fire Protection Association) 805, a review of the Brunswick Steam Electric Plant (BSEP) Safe Shutdown Analysis identified conditions that may not ensure required equipment remains available under certain postulated fire scenarios. The analysis determined that the effects of a postulated fire in specific fire areas could prevent critical systems or components from performing their intended functions, potentially resulting in the inability to achieve and maintain safe shutdown. Alternate safe shutdown procedures currently credited with bringing about operator actions to mitigate a postulated fire have been found not to contain needed actions.
Affected fire areas are RB1-N, RB1-S, RB2-N, RB2-S, DG-07, and DG-08E. A fire in one of these areas could potentially adversely affect Emergency Diesel Generators (EDGs) 2, 3, and 4 along with EDG Building ventilation system components that could fail vital auxiliaries (HVAC) to the affected switchgear rooms. This is reportable as an unanalyzed condition that significantly degrades plant safety in accordance with 10 CFR 50.72(b)(3)(ii)(B). Most required fire watches were already in place as a result of a previous similar event reported in Brunswick ENS 47341 and Brunswick LER 1-2011-002. Two additional actions have been taken to establish fire watches in areas containing electrical busses E6 and E7. This condition has been entered into the Corrective Action Program (i.e., CR 619341). The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+2.62 h0.109 days <br />0.0156 weeks <br />0.00359 months <br />) | |
| Opened: | Stuart Byrd 17:19 Jul 29, 2013 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Jul 29, 2013 |
| 49222 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 499352014-03-20T13:11:00020 March 2014 13:11:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire-Related Unanalyzed Condition That Could Impact Credited Safe Shutdown Analysis ENS 492222013-07-29T14:42:00029 July 2013 14:42:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire Related Unanalyzed Condition That Could Impact Credited Safe Shutdown Analysis ENS 482532012-08-30T01:34:00030 August 2012 01:34:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Local Control Capability of Emergency Diesel Generator #2 Not Available Under Certain Conditions ENS 474522011-11-17T18:45:00017 November 2011 18:45:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition on Startup Following Maintenance Outage ENS 473412011-10-13T14:00:00013 October 2011 14:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire Related Unanalyzed Condition That Could Impact Equipment Credited in Safe Shutdown Analysis ENS 444252008-08-19T15:10:00019 August 2008 15:10:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Alternate Safe Shutdown Local Start Capability of All Four Emergency Diesel Generators May Not Be Available Under Certain Conditions ENS 411602004-10-29T20:00:00029 October 2004 20:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Discovered in 480 Volt Switchgear Room 2014-03-20T13:11:00 | |
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