ENS 45664
ENS Event | |
|---|---|
12:30 Jan 27, 2010 | |
| Title | Electrical Power Temporarily Removed from the Emergency Operations Facility for Maintenance |
| Event Description | This is an eight hour report per 10 CFR 50.72(b)(3)(viii). Seabrook Station will be implementing a modification to improve reliability of the electrical system serving the Emergency Operations Facility (EOF). Specifically, the existing manual transfer switch between the backup power diesel generator and the EOF building will be replaced with an automatic transfer switch.
This work will require that the main power feed to the EOF building be removed for a period of approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> today. During this time, a secondary power feed will remain in service which can supply some building loads. A second 3-hour period of 'partial power' may be necessary to complete the job; it is currently anticipated that this second 'partial power' period, if needed, will occur tomorrow, January 28. Power to all EOF loads will be available in between the two 3-hour periods discussed above. In addition, should an emergency be declared during one of the 3-hour periods, full power to the facility can be restored within approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. As a compensatory measure, the TSC will perform the key planning standard functions assigned to the EOF during the two 'partial power' time periods should the EOF be unable to do so; this includes offsite dose projections, development of protective action recommendations and offsite notifications. Emergency plan implementing procedures for the TSC contain the instructions necessary for TSC responders to perform functions. During the 2-day period that this work is being performed, there will be no backup power source for the EOF. All work associated with this switch upgrade will be performed in an expeditious manner consistent with the goal of minimizing EOF unavailability. All EOF responders have been briefed on this work and expected contingent actions. This job will start at approximately 0730 am this morning. We anticipate that all work will be completed by sometime tomorrow afternoon. We will provide a notification update upon completion of the job. The licensee has notified the NRC Resident Inspector.
Seabrook station has completed the installation of the automatic transfer switch at the Emergency Operations Facility (EOF). There is no planned work affecting EOF availability. Notified R1DO(Hansell). |
| Where | |
|---|---|
Seabrook  New Hampshire (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-4.85 h-0.202 days <br />-0.0289 weeks <br />-0.00664 months <br />) | |
| Opened: | Thomas Waechter 07:39 Jan 27, 2010 |
| NRC Officer: | Dong Park |
| Last Updated: | Jan 27, 2010 |
| 45664 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 545692020-03-06T02:00:0006 March 2020 02:00:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Plant Computer Outage for System Upgrade ENS 519322016-05-16T07:00:00016 May 2016 07:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitoring System Out of Service for Planned Upgrade ENS 483632012-10-01T08:24:0001 October 2012 08:24:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Is Unavailable for Service ENS 479172012-05-11T09:15:00011 May 2012 09:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Brief Loss of the Emergency Notification System Phone ENS 456642010-01-27T12:30:00027 January 2010 12:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Electrical Power Temporarily Removed from the Emergency Operations Facility for Maintenance ENS 452292009-07-27T11:52:00027 July 2009 11:52:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Removed from Service for Upgrades 2020-03-06T02:00:00 | |