All Fukushima Daini units in cold shutdown

15 March 2011

All four units at the Fukushima Daini nuclear power plant have now achieved cold shutdown - where coolant water is at less than 100ºC - with full operation of cooling systems, Tepco reported. All the reactors shut down automatically during last week's earthquake and have remained safe. While unit 3's shutdown went as expected, damage to the emergency core cooling systems of units 1, 2 and 4 led to the announcement of emergency status. These three reactors were prepared for potential pressure release, but this was never required. Unit 1 announced cold shutdown at 1.24 am on 14 March and unit 2 followed at 3.52 am. Tepco has now announced that unit 4 achieved cold shutdown at 7.15 pm on 15 March. Water levels are now stable in all four reactors and offsite power is available, the company said.