ENS 49935
ENS Event | |
|---|---|
13:11 Mar 20, 2014 | |
| 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) Standard 805, an update to the Brunswick Steam Electric Plant (BSEP) Safe Shutdown Analysis has been performed which identified circuit configurations where fire damage, under certain postulated fire scenarios, could impact the ability to safely shut down following a fire, in accordance with 10 CFR 50, Appendix R.
Affected fire areas are CB-23E, RB1-N, RB1-S, RB2-N, RB2-S, TB1, DG-07, and DG-16E. A fire in one of these areas could potentially affect the post fire capability of the following safe shutdown systems: 1) Containment Overpressure Protection, 2) Emergency Bus Load Shed, 3) Control Room HVAC, or 4) Emergency Diesel Generator Building HVAC. This is reportable as an unanalyzed condition that significantly degrades plant safety in accordance with 10 CFR 50.72(b)(3)(ii)(B). Fire protection compensatory measures (i.e. roving fire watches) currently exist in the affected fire areas. This event did not result in any adverse impact to the health and safety of the public. The safety significance is minimal. Fire watches were already ongoing in these areas prior to the time of discovery. The conditions identified here are based on hypothetical fire scenarios that have not actually occurred. This condition has been entered into the Corrective Action Program (i.e. CR 676576). Previous similar events were reported in NRC Event Reports 47341 and 49222, and in Brunswick LERs 1-2011-002 and 1-2013-002. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-1.62 h-0.0675 days <br />-0.00964 weeks <br />-0.00222 months <br />) | |
| Opened: | Craig Oliver 11:34 Mar 20, 2014 |
| NRC Officer: | Charles Teal |
| Last Updated: | Mar 20, 2014 |
| 49935 - NRC Website
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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 | |