ENS 51173
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ENS Event | |
|---|---|
08:42 Jun 23, 2015 | |
| Title | Loss of Emergency Preparedness Capability Due to Phone System Failures |
| Event Description | At 0342 [CDT], as a result of severe weather conditions in the area, Exelon Generation Company, LLC (EGC) identified that the Emergency Notification System (ENS), Health Physics Network (HPN) phone systems, and their associated back-up system, the commercial phone system, had failed at Dresden Nuclear Power Station (DNPS). A loss of the primary phone system concurrent with the loss of the associated back-up system is a reportable condition in accordance with 10 CFR 50.72 (b)(3)(xiii) - Major Loss of Emergency Preparedness Capabilities.
As a result of the failed communication systems, DNPS contacted the NRC to notify them of the issue and provided an alternate phone number for the Shift Manager for use until the systems were restored. As of 0743 [CDT], ENS, HPN, and the commercial phone systems were restored and verified to be working properly. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+1.73 h0.0721 days <br />0.0103 weeks <br />0.00237 months <br />) | |
| Opened: | Ryan Chamberlin 10:26 Jun 23, 2015 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Jun 23, 2015 |
| 51173 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 563612023-02-06T11:30:0006 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 525422017-02-08T14:51:0008 February 2017 14:51:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Emergency Ventilation System Inoperable ENS 523702016-11-16T17:05:00016 November 2016 17:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation System Inoperable ENS 521072016-07-20T16:30:00020 July 2016 16:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Out-Of-Service for Planned Preventative Maintenance ENS 520982016-07-18T20:00:00018 July 2016 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communications Capability ENS 516642016-01-20T10:00:00020 January 2016 10:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Preventative Maintenance ENS 512322015-07-15T05:04:00015 July 2015 05:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service Due to Planned Maintenance ENS 511732015-06-23T08:42:00023 June 2015 08:42:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Preparedness Capability Due to Phone System Failures ENS 507592015-01-26T09:55:00026 January 2015 09:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Preventative Maintenance ENS 502892014-07-21T10:25:00021 July 2014 10:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Preventative Maintenance ENS 497872014-02-03T06:43:0003 February 2014 06:43:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Emergency Ventilation System Out of Service for Planned Maintenance ENS 491882013-07-14T21:00:00014 July 2013 21:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Preventative Maintenance ENS 471192011-08-03T09:00:0003 August 2011 09:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Preventative Maintenance ENS 469012011-05-28T14:12:00028 May 2011 14:12:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Inbound Phone Call Capabilities on Commercial and Fts Lines ENS 461062010-07-19T04:30:00019 July 2010 04:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications Capability Due to Planned At&T Fiber Optic Cable Outage ENS 459512010-05-24T22:25:00024 May 2010 22:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Declared Inoperable ENS 455502009-12-08T19:28:0008 December 2009 19:28:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Preventative Maintenance ENS 441302008-04-09T21:15:0009 April 2008 21:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of All Ens Telephone Lines on Site After Maintenance ENS 407462004-05-14T00:15:00014 May 2004 00:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Ens and Commercial Phone Lines to Control Rooms 2023-02-06T11:30:00 | |
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