ENS 49914
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ENS Event | |
|---|---|
20:30 Mar 13, 2014 | |
| Title | Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment |
| Event Description | A review of industry Operating Experience identified that there were unprotected DC control circuits for non safety-related DC motors which are routed from the turbine building to other separate fire areas. Fuses used to protect the motor power conductors appear to be inadequate to protect the control conductors. The concern is that under fire safe shutdown conditions, it is postulated that a fire in one area can cause short circuits potentially resulting in secondary fires or cable failures in other fire areas where the cables are routed. The secondary fires or cable failures are outside the assumptions of the 10 CFR 50 Appendix R Safe Shutdown Analysis.
This condition is reportable as an 8-hour ENS report in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Compensatory measures (fire watches) have been implemented for affected areas of the plant. The NRC Resident Inspector has been notified. . |
| Where | |
|---|---|
Ginna  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-1.58 h-0.0658 days <br />-0.0094 weeks <br />-0.00216 months <br />) | |
| Opened: | Tom Joachimczyk 18:55 Mar 13, 2014 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Mar 13, 2014 |
| 49914 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 499142014-03-13T20:30:00013 March 2014 20:30:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment ENS 493742013-09-20T20:00:00020 September 2013 20:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Potential Design Basis Flooding Issues Related to Battery Room Wall Penetrations and Cable Vault Floor Drains ENS 489182013-04-12T14:10:00012 April 2013 14:10:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Missing Backflow Preventer ENS 483332012-09-21T18:00:00021 September 2012 18:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Identified in Appendix R Fire Scenario ENS 471672011-08-18T14:00:00018 August 2011 14:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition That Could Potentially Impact Both Trains of 480V Safeguards Buses ENS 467352011-04-06T19:30:0006 April 2011 19:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Degraded Fire Barrier ENS 428312006-09-07T02:00:0007 September 2006 02:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Historical Unanalyzed Condition Identified ENS 425882006-05-18T19:00:00018 May 2006 19:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unevaluated Failure of Charging Pump in Fire Scenario ENS 408932004-07-22T13:42:00022 July 2004 13:42:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Gap Discovered in Control Room Envelope ENS 401842003-09-19T22:00:00019 September 2003 22:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition 2014-03-13T20:30:00 | |
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