ENS 48253
ENS Event | |
|---|---|
01:34 Aug 30, 2012 | |
| Title | Local Control Capability of Emergency Diesel Generator #2 Not Available Under Certain Conditions |
| Event Description | On August 28, 2012, during planned maintenance on Emergency Diesel Generator No.2, a post-maintenance continuity testing associated with the Alternate Safety Shutdown (ASSD) switch on Emergency Diesel Generator No.2 (EDG 2) revealed unexpected results when the switch was taken to the LOCAL position. Troubleshooting activities determined the switch to be operating properly, meaning the contacts are actually open. However, a current path preventing isolation of the control room circuit remained. It was determined that a wire, not identified in EDG wiring diagrams, created a short between two ASSD switch contacts.
At 2134 hours0.0247 days <br />0.593 hours <br />0.00353 weeks <br />8.11987e-4 months <br /> Eastern Daylight Time (EDT) on August 29, 2012, it was concluded that the condition may impact the ability of EDG 2 to perform its intended ASSD function. In the event of a fire, an induced fault could potentially affect the ability to locally control EDG 2. Local control of EDG 2 is credited in the safe shutdown analysis. Therefore, this condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. This condition did not result in any adverse impact to the health and safety of the public. This condition has no affect on the Technical Specification operability of EDG 2 and it was fully capable of performing its intended design basis accident response functions given the as-found condition of the circuitry. The initial safety significance of this condition is minimal. This condition has no affect on the Technical Specification operability of EDG 2 and it was fully capable of performing its intended design basis accident response functions given the as-found condition of the circuitry. Repairs to the ASSD switch wiring have been completed. Post maintenance testing is occurring at this time. Planning is in progress to inspect the remaining Emergency Diesel Generators for similar conditions. 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 | |
| LER: | 05000325/LER-2012-005 |
| Time - Person (Reporting Time:+1 h0.0417 days <br />0.00595 weeks <br />0.00137 months <br />) | |
| Opened: | Mike O'Dell 02:34 Aug 30, 2012 |
| NRC Officer: | Dong Park |
| Last Updated: | Aug 30, 2012 |
| 48253 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 48253\u003C/a\u003E - \u003Ca href=\"/Brunswick\" title=\"Brunswick\"\u003EBrunswick\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ELocal Control Capability of Emergency Diesel Generator #2 Not Available Under Certain Conditions\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 48253 - Brunswick\n","link":"","lat":33.95840833333333,"lon":-78.00979722222222,"icon":"/w/images/7/75/Duke_Energy_icon.png"}],"imageoverlays":null} | |
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 | |