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On March 30, 2009, at approximately 1843 h … On March 30, 2009, at approximately 1843 hours EDT, the control room reported a loss of power to non-safety 480 volt busses F1C and F1D. Initial investigation revealed an instantaneous ground over-current (50G) relay had actuated. This relay actuation resulted in the supply breaker tripping and all associated loads being de-energized. This resulted in a loss of 120 VAC non-essential electrical power to a portion of the Emergency Response Data System (ERDS).</br>In the event of an emergency, plant parameter data will be orally transmitted to the facilities through the status Board Ring Down circuit with back-up by the Private Branch Exchange, Off Premise Exchange, and various redundant intra-facility circuits throughout the emergency facilities. The ability to open and maintain an open line using the Emergency Notification System will not be affected and will be the primary means of transferring plant data to the NRC as a contingency until the ERDS can be returned to service during the period of unavailability.</br>This event is being reported in accordance with 10 CFR 50.72(b)(3)(xiii) as a condition that results in a major loss of emergency offsite communications capability. A follow-up notification will be made when the equipment is restored. </br>The NRC Resident Inspector has been notified." The unit is currently defueled.</br>* * * UPDATE FROM TOM STEC TO JOE O'HARA AT 1600 EDT ON 3/31/09 * * * </br>Last evening, power was restored to ERDS following maintenance. ERDS is capable of performing its intended function. Notified R3DO(Orth)ts intended function. Notified R3DO(Orth) +
22:43:00, 30 March 2009 +
44,945 +
23:04:00, 30 March 2009 +
22:43:00, 30 March 2009 +
On March 30, 2009, at approximately 1843 h … On March 30, 2009, at approximately 1843 hours EDT, the control room reported a loss of power to non-safety 480 volt busses F1C and F1D. Initial investigation revealed an instantaneous ground over-current (50G) relay had actuated. This relay actuation resulted in the supply breaker tripping and all associated loads being de-energized. This resulted in a loss of 120 VAC non-essential electrical power to a portion of the Emergency Response Data System (ERDS).</br>In the event of an emergency, plant parameter data will be orally transmitted to the facilities through the status Board Ring Down circuit with back-up by the Private Branch Exchange, Off Premise Exchange, and various redundant intra-facility circuits throughout the emergency facilities. The ability to open and maintain an open line using the Emergency Notification System will not be affected and will be the primary means of transferring plant data to the NRC as a contingency until the ERDS can be returned to service during the period of unavailability.</br>This event is being reported in accordance with 10 CFR 50.72(b)(3)(xiii) as a condition that results in a major loss of emergency offsite communications capability. A follow-up notification will be made when the equipment is restored. </br>The NRC Resident Inspector has been notified." The unit is currently defueled.</br>* * * UPDATE FROM TOM STEC TO JOE O'HARA AT 1600 EDT ON 3/31/09 * * * </br>Last evening, power was restored to ERDS following maintenance. ERDS is capable of performing its intended function. Notified R3DO(Orth)ts intended function. Notified R3DO(Orth) +
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00:00:00, 31 March 2009 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
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22:43:00, 30 March 2009 +
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