Timeline of Dominion Virginia Power nuclear plant outages
In the past two years, the company's four reactors have experienced 14 unplanned shutdowns.
Date
Unit
Outage duration
Cause
Oct. 23, 2009
North Anna 1
5.78 days
Repair pinhole leak in pipe weld.
Dec. 9, 2009
North Anna 2
2.99 days
Inadvertent opening of a switchyard breaker leading to loss of power to circulating water pumps.
April 27, 2010
North Anna 2
1.55 days
Automatic voltage regulator trip due to human error in computer program.
June 8, 2010
Surry 1
3.48 days
Unit tripped because of dropped electrical lead resulting in loss of vital electric system.
June 16, 2010
North Anna 2
2.81 days
Unit tripped because of lightning strike.
July 11, 2010
Surry 2
4.73 days
Repair leak in circulating water line.
July 14, 2010
North Anna 1
4.43 days
Repair two leaks in steam generator sampling line.
May 28, 2010
North Anna 2
6.39 days
Reactor trip caused by lightning strike.
Nov. 6, 2010
North Anna 2
1.8 days
Repair main generator hydrogen coolant leak.
Feb. 2, 2011
Surry 2
15.83 days
Automatic reactor trip due to failure of a stop valve affecting reactor coolant flow.
April 16, 2011
Surry 1
7.04 days
Automatic reactor trip from loss of off-site power as a result of a tornado touching down in plant electrical switchyard.
April 16, 2011
Surry 2
Automatic reactor trip from loss of off-site power as a result of a tornado touching down in plant electrical switchyard (planned refueling outage began immediately after the trip).
Aug. 23, 2011
North Anna 1 and 2
Both reactors tripped automatically because of the earthquake in central Virginia.
Dominion Virginia Power
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