Announcements

At around 6:57 PM on March 18, there was an incident where the power supply facilities in the Main Anti-earthquake Building at Fukushima Daiichi Nuclear Power Station momentarily stopped. The updates on the incident are provided below.

[ Unit 4 spent fuel pool alternative cooling system ]

 The primary system of Unit 4 spent fuel pool alternative cooling system was started at 1:20 PM, and the secondary system was restarted at 4:13 PM today using a diesel generator.

Since the secondary system had received power from the regular M/C in the Process Building, it was stopped at 6:48 PM today, and it was restarted using the power from the regular M/C in the Process Building.

When the system was restarted, the temperature of the spent fuel pool was 31 Celsius and there were enough margins to the operational limit of 65 Celsius.

 [ Unit 3 spent fuel pool alternative cooling system ]

 The Unit 3 spent fuel pool alternative cooling system was restarted at 10:43 PM for the primary and secondary system. Now we are checking the temperature of the pool when we restarted the system.

 [ Common pool cooling purification system ]

 It is supposed to restart the common pool cooling purification system by 8:00 PM on March 20. However, we are working on it to start the system before the planned time. Soon after we restart the system, we will inform you about it.