ENS 45205
ENS Event | |
|---|---|
18:00 Jul 13, 2009 | |
| Title | Temporary Loss of Power to Ten Emergency Notification Sirens |
| Event Description | On Monday July 13, 2009, at approximately 1100 PDT, Southern California Edison discovered a loss of the ability to activate 10 Community Alert Sirens (CAS) located on the Camp Pendleton Marine Corp Base. Prior to the discovery, the most recent test demonstrating operability of the sirens was performed on July 10, 2009, at approximately 1152 PDT. On July 13, 2009, at approximately 1130 PDT, SCE re-established the ability to activate the sirens. SCE is currently conducting an investigation to determine the cause of the problem, to try to ascertain the time that the loss of ability to activate the sirens occurred, and to identify the cause of the delay in reporting this event.
SCE assumes the sirens were inoperable for greater than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, and therefore, is reporting this event as a loss of emergency offsite capability, in accordance with 10 CFR 50.72(b)(3)(xiii). At the time of this report, Unit 2 and Unit 3 were operating at about 99 percent and 100 percent power, respectively. A CAS power panel was found with a tripped breaker. An investigation into the cause of the breaker trip is ongoing. The licensee notified the NRC Resident Inspector.
During a follow up investigation, SCE identified information to indicate the loss of the ability to activate the 10 Community Alert Sirens located on the Camp Pendleton Marine Corp Base occurred at approximately 1800 PDT on July 10, 2009. Therefore, the sirens were inoperable for greater than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. Additionally, SCE verified that, prior to the discovery of the inoperable sirens, the most recent test demonstrating operability of the sirens was performed on July 10, 2009 at 1053 PDT (not 1152 PDT as initially reported). The NRC Resident Inspector has been notified and will be provided with a copy of this report. Notified R4DO Vincent Gaddy. |
| Where | |
|---|---|
San Onofre  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+28.3 h1.179 days <br />0.168 weeks <br />0.0388 months <br />) | |
| Opened: | Mike Mcbrearty 22:18 Jul 14, 2009 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jul 16, 2009 |
| 45205 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (99 %) |
| After | Power Operation (99 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 475502011-12-23T13:00:00023 December 2011 13:00:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Out of Service ENS 467112011-03-30T14:00:00030 March 2011 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Sirens Out of Service Due to Inadvertent Securing of Power ENS 465032010-12-22T03:32:00022 December 2010 03:32:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Access to Primary Emergency Operations Facility Not Possible Due to Road Flooding ENS 457142010-02-21T16:00:00021 February 2010 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Power Outage at Primary Emergency Operations Facility (Eof) ENS 456342010-01-19T03:50:00019 January 2010 03:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Inaccessible Due to Road Flooding ENS 454622009-10-23T19:05:00023 October 2009 19:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Preparedness Capabilities ENS 452052009-07-13T18:00:00013 July 2009 18:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Temporary Loss of Power to Ten Emergency Notification Sirens ENS 443552008-07-18T15:00:00018 July 2008 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Inoperable for Maintenance Work ENS 442512008-05-30T22:05:00030 May 2008 22:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Power Outage at Primary Emergency Operations Facility (Eof) ENS 438372007-12-11T19:05:00011 December 2007 19:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Major Loss of Communications Capability ENS 419582005-08-29T17:45:00029 August 2005 17:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Safety Parameter Display System and Emergency Response Data System Planned Upgrade Outage ENS 414772005-03-09T08:00:0009 March 2005 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Loss of the Emergency Response Data System ENS 413202005-01-10T03:45:00010 January 2005 03:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness San Onofre Emergency Operations (Eof) Inaccessible Due to Road Flooding 2011-03-30T14:00:00 | |