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A planned maintenance evolution at the Dua … A planned maintenance evolution at the Duane Arnold Energy Center (DAEC) will have the potential to remove the plant computer systems (Plant Process Computer, Intranet, and Internet) from service. The TSC would be rendered non-functional with the loss of all computer systems. The replacement and testing of the automatic power transfer relay is expected to de-energize the computer systems for less than 20 minutes at any time.</br>If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures. Maintenance will be terminated and power will be restored to the plant computer systems. The restoration of power to all computer systems is estimated to take less than one hour.</br>This notification is being made in accordance with 10CFR50.72 (b)(3)(xiii) due to the potential loss of an Emergency Response Facility (ERF). An update will be provided once the plant computer systems power supplies have been restored to normal operation.</br>The licensee has notified the NRC Resident Inspector.</br>* * * UPDATE FROM STEVE BREWER TO CHARLES TEAL ON 08/10/11 AT 1305 EDT * * * </br>The TSC has been restored to operational status.</br>The licensee has notified the NRC Resident Inspector. Notified R3DO (Dickson).</br>* * * UPDATE FROM ROBERT SPADING TO JOE O'HARA ON 08/12/11 AT 2205 EDT * * * </br>The licensee is performing planned maintenance on the TSC automatic power transfer relay which could render the TSC inoperable if power to the TSC computers is lost. Maintenance is expected to commence at 2130 CDT.</br>The licensee has notified the NRC Resident Inspector. Notified R3DO (Peterson).dent Inspector. Notified R3DO (Peterson). +
06:00:00, 10 August 2011 +
47,138 +
02:06:00, 10 August 2011 +
06:00:00, 10 August 2011 +
A planned maintenance evolution at the Dua … A planned maintenance evolution at the Duane Arnold Energy Center (DAEC) will have the potential to remove the plant computer systems (Plant Process Computer, Intranet, and Internet) from service. The TSC would be rendered non-functional with the loss of all computer systems. The replacement and testing of the automatic power transfer relay is expected to de-energize the computer systems for less than 20 minutes at any time.</br>If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures. Maintenance will be terminated and power will be restored to the plant computer systems. The restoration of power to all computer systems is estimated to take less than one hour.</br>This notification is being made in accordance with 10CFR50.72 (b)(3)(xiii) due to the potential loss of an Emergency Response Facility (ERF). An update will be provided once the plant computer systems power supplies have been restored to normal operation.</br>The licensee has notified the NRC Resident Inspector.</br>* * * UPDATE FROM STEVE BREWER TO CHARLES TEAL ON 08/10/11 AT 1305 EDT * * * </br>The TSC has been restored to operational status.</br>The licensee has notified the NRC Resident Inspector. Notified R3DO (Dickson).</br>* * * UPDATE FROM ROBERT SPADING TO JOE O'HARA ON 08/12/11 AT 2205 EDT * * * </br>The licensee is performing planned maintenance on the TSC automatic power transfer relay which could render the TSC inoperable if power to the TSC computers is lost. Maintenance is expected to commence at 2130 CDT.</br>The licensee has notified the NRC Resident Inspector. Notified R3DO (Peterson).dent Inspector. Notified R3DO (Peterson). +
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00:00:00, 12 August 2011 +
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