2 Juillet 2012
July 2, 2012
TOKYO (Kyodo) -- Tokyo Electric Power Co. said Sunday it has resumed cooling the spent fuel pool of the crippled Fukushima Daiichi power plant's No. 4 reactor following emergency repair work after the cooling system shut down on Saturday.
The water temperature of the pool had risen to 42.9 C when the utility known as TEPCO turned the cooling system back on shortly after 3 p.m., compared with 33.3 C at the time of the shutdown on Saturday morning.
TEPCO had feared that the temperature could reach 65 C, the upper limit designated in safety regulations.
The company believes a part in the emergency power unit for the cooling system caused the problem and plans to replace it soon.
The pool contains 1,535 fuel assemblies, including 204 unused ones. Previously, the cooling system at the No. 4 reactor was suspended on June 4.