ENS 50933
From kanterella
Jump to navigation
Jump to search
ENS Event | |
|---|---|
14:41 Mar 27, 2015 | |
| Title | Seismic Monitor Not Available for Emergency Plan Assessment |
| Event Description | Braidwood Generating Station has completed a review of seismic monitor performance. The emergency preparedness plan requires seismic monitoring instruments to diagnose an earthquake for emergency action levels (EAL) HA4 (natural and destructive phenomena affecting vital areas) or HU4 (natural and destructive phenomena affecting the protected area). Contrary to that requirement, this review identified 5 times in the past 3 years that the seismic monitor was non-functional such that emergency classification at the ALERT or UNUSUAL EVENT level could not be obtained with site instrumentation.
The seismic monitor is currently functional; however, the seismic monitor was determined to be non-functional on the following dates: 1. April 24, 2012 2. December 5, 2012 3. December 20, 2012 4. June 17, 2013 5. October 8, 2014 These non-functional conditions of the seismic monitor have been corrected and were entered into the Braidwood Corrective Action Program. While Exelon procedural direction allowed the use of offsite sources to obtain seismic data when the seismic monitor is incapable of assessing emergency plan Emergency Action Levels (EALs), this was not explicitly referenced in the Braidwood approved EALs. The loss of assessment capability is reportable to the NRC within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> of discovery in accordance with 10 CFR 50.72(b)(3)(xiii). This report is required per 10 CFR 50.72(a)(1)(ii) as an event that occurred within 3 years of the date of discovery. Corrective actions are in progress. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Braidwood  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+2.52 h0.105 days <br />0.015 weeks <br />0.00345 months <br />) | |
| Opened: | Linsay Green 17:12 Mar 27, 2015 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Mar 27, 2015 |
| 50933 - 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 50933\u003C/a\u003E - \u003Ca href=\"/Braidwood\" title=\"Braidwood\"\u003EBraidwood\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ESeismic Monitor Not Available for Emergency Plan Assessment\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 50933 - Braidwood\n","link":"","lat":41.24283055555556,"lon":-88.2290111111111,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (93 %) |
| After | Power Operation (93 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 563522023-02-06T11:30:0006 February 2023 11:30:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications and Assessment Capabilities ENS 553252021-06-24T14:01:00024 June 2021 14:01:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Capability ENS 540902019-05-26T00:30:00026 May 2019 00:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Main Control Room Area Radiation Monitors ENS 531802018-01-23T10:00:00023 January 2018 10:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability Due to Technical Support Center Planned Maintenance ENS 521032016-07-18T20:00:00018 July 2016 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability ENS 511542015-06-15T12:00:00015 June 2015 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Ventilation to Be Removed from Service for Planned Maintenance ENS 510922015-05-27T14:45:00027 May 2015 14:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 509572015-04-06T13:09:0006 April 2015 13:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 509332015-03-27T14:41:00027 March 2015 14:41:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Not Available for Emergency Plan Assessment ENS 504312014-09-06T11:13:0006 September 2014 11:13:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Air Conditioning Condensing Units Out of Service ENS 503972014-08-25T10:00:00025 August 2014 10:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Planned Maintenance ENS 502472014-07-01T12:15:0001 July 2014 12:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Alert and Notification System Failure ENS 501622014-06-01T18:14:0001 June 2014 18:14:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Cooling Capability ENS 497232013-10-16T19:20:00016 October 2013 19:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service ENS 483282012-09-21T01:35:00021 September 2012 01:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Inoperable ENS 478452012-04-18T02:30:00018 April 2012 02:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Process Computer Removed from Service for Planned Replacement ENS 476222012-01-26T03:00:00026 January 2012 03:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service Due to Planned Maintenance ENS 467662011-04-19T04:09:00019 April 2011 04:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Process Computer Removed from Service for Planned Replacement ENS 435902007-08-23T20:30:00023 August 2007 20:30:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Manual Reactor Trip Because of Lowering Condenser Vacuum ENS 431372007-02-01T15:25:0001 February 2007 15:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Phone Connections ENS 418582005-07-21T00:17:00021 July 2005 00:17:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Sirens Failed for One Hour ENS 409222004-08-04T12:15:0004 August 2004 12:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Notification Due to Inoperable Sirens 2023-02-06T11:30:00 | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_50933&oldid=421691"