ENS 48019
ENS Event | |
|---|---|
21:57 Jun 12, 2012 | |
| Title | Loss of the Plant Process Computer System |
| Event Description | At 1757 EDT on 6/12/12, Brunswick Nuclear Plant experienced a fault on the Emergency Response Facility Information System (ERFIS) uninterruptible power supply (UPS) electrical bus 'A'. This resulted in a loss of site Safety Parameter Display System (SPDS), Emergency Response Data System (ERDS) and Plant Process Computer (PPC) for both Unit 1 and Unit 2. The cause of the fault is not yet understood and under investigation. No other major plant effects occurred and no major plant evolutions are planned.
During the loss of SPDS, the emergency response capability of that system was lost to the site. During the loss of ERDS, the automatic data transfer feature of that system was lost for transmissions to the NRC, however manual data transfer is still available. During the loss of the PPC, automatic core thermal power averaging and automatic core thermal limit monitoring was lost. Manual calculations are available for these functions. Unit 1 SPDS was restored to the Emergency Operations Facility (EOF) at 1949 EDT. Unit 2 SPDS was restored to the EOF at 2030 EDT. ERDS and PPC remain unavailable with troubleshooting in progress. Both units reduced power to 98% as a conservative measure. The NRC Resident Inspector has been notified.
The Unit 1 and 2 ERFIS, SPDS, and ERDS functions were restored by approximately 0630 hours0.00729 days <br />0.175 hours <br />0.00104 weeks <br />2.39715e-4 months <br /> on June 13, 2012, after an alternate power supply configuration was established. In addition, the PPC functions were restored by approximately 1630. Compensatory actions will be maintained until the UPS 'A' bus is restored and returned to normal configuration. The Brunswick Emergency Response Organization (ERO) Site Emergency Coordinator and Emergency Response Manager have been briefed on the compensatory actions in place. Investigation of this condition will be documented in the corrective action program in Condition Report (CR) 542704. The NRC Resident Inspector was notified. Notified R2DO(Ayres) |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+3.68 h0.153 days <br />0.0219 weeks <br />0.00504 months <br />) | |
| Opened: | John Miller 01:38 Jun 13, 2012 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Jun 14, 2012 |
| 48019 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (98 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (98 %) |
WEEKMONTHYEARENS 547722020-07-10T13:00:00010 July 2020 13:00:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Common Emergency Operations Facility Maintenance ENS 520692016-07-06T22:07:0006 July 2016 22:07:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Notification to the United States Department of Transportation ENS 504592014-09-15T17:09:00015 September 2014 17:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Activation Capability ENS 503552014-08-12T08:32:00012 August 2014 08:32:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unusual Event for a Halon Release Near the Tsc and Eof ENS 483622012-10-01T12:45:0001 October 2012 12:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) / Emergency Operations Facility (Eof) Out-Of-Service for Planned Maintenance ENS 480322012-06-17T17:30:00017 June 2012 17:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Outage of Erfis, Spds, Erds, and Ppc ENS 480192012-06-12T21:57:00012 June 2012 21:57:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of the Plant Process Computer System ENS 473112011-10-01T20:00:0001 October 2011 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Erds Connectivity Due to a Computer Issue ENS 472152011-08-29T16:00:00029 August 2011 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Out of Service for Maintenance ENS 458132010-04-05T03:34:0005 April 2010 03:34:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Activation Capability ENS 427242006-07-24T21:00:00024 July 2006 21:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss and Restoration of Spds System ENS 419912005-09-14T12:32:00014 September 2005 12:32:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Emergency Preparedness Sirens ENS 419262005-08-17T20:15:00017 August 2005 20:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Emergency Sirensout of Service Due to Severe Weather ENS 409552004-08-14T16:25:00014 August 2004 16:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Several Offsite Emergency Preparedness Sirens Due to Adverse Weather ENS 403152003-11-12T15:03:00012 November 2003 15:03:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Siren Test Failure 2020-07-10T13:00:00 | |