Oct. 7, 2013
Tokyo Electric Power Co. said that a cooling pump that injects water into one of the damaged reactors at the Fukushima No. 1 power plant halted Monday, possibly due to another problem in the power switchboard.
The pump came to a halt at around 9:47 a.m., but the cooling of reactor 1 resumed immediately through a backup pump, Tepco said.
The Nuclear Regulation Authority separately said in a press release that a worker may have mistakenly pushed the stop button on a switchboard during an equipment check.
Reactors 1 to 3 suffered meltdowns shortly after the March 2011 Great East Japan Earthquake because the subsequent tsunami caused a facilitywide blackout and knocked out the backup cooling systems at the poorly protected plant, which is more than 40 years old.