information about Fukushima published in English in Japanese media info publiée en anglais dans la presse japonaise
19 Mars 2013
http://www.tepco.co.jp/en/announcements/2013/1225705_5502.html
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.
At 0:12 AM today, the common pool cooling purification system was restarted.
When the system was restarted, the temperature of the common pool was 31.8 Celsius and there were enough margins to the operational limit of 65 Celsius.
All of the systems we explained on yesterday's press conference have been restarted.
http://www.tepco.co.jp/en/announcements/2013/1225703_5502.html
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.
We announced that the Unit 3 spent fuel pool alternative cooling system was restarted in the previous announcement and stated “We are checking the temperature of the pool when we restarted the system.”
When the system was restarted, the temperature of the spent fuel pool was 17 Celsius and there were enough margins to the operational limit of 65 Celsius.
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.
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.
-The primary and secondary systems of Unit 1 spent fuel pool alternative cooling system were started at 2:20 PM and cooling has been restarted.
-Unit 3 spent fuel pool alternative cooling system is planned to be restarted at 8:00 PM today.
-The primary system of Unit 4 spent fuel pool alternative cooling system was started at 1:20 PM. The secondary system is planned to be restarted at 8:00 PM today.
-Common pool cooling purification system is planned to be restarted at 8:00 AM tomorrow.
Other affected facilities are currently being recovered. The current water temperatures of the suspended spent fuel pools have no impact on the spent fuel pool water temperature control.
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.
The cesium absorption apparatus (Kurion) of the water treatment facility which was suspended due to the incident was started at 12:01 PM today, and the steady flow rate was achieved at 12:17 PM. No problem has been found with its operation.
The power supply facilities for which soundness was confirmed have been recovered as follows. Units 1 and 4 spent fuel pool alternative cooling systems are currently being recovered.
- The regular M/C in the Process Building has received power from the backup M/C in the Process Building at 9:03 AM today.
- The common M/C4A has received power from the regular M/C in the Process Building at 10:01 AM today.
The current water temperatures of the suspended spent fuel pools have no impact on the spent fuel pool water temperature contro
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.
Upon investigation, the following facilities were confirmed to be suspended.
- Common pool cooling purification system
- Nitrogen supply equipment (Nitrogen separator B)*
*After confirming the soundness of the power supply, the equipment was started at 3:00 AM on March 19 and nitrogen supply was started at 3:10 AM. Nitrogen injection had continued while the equipment was suspended as the other nitrogen supply equipment (nitrogen separator A) was in operation.
No problem has been found with the following facilities.
- Units 1-3 nitrogen injection systems
- Nitrogen supply equipment (Nitrogen separator A)
Since it takes a certain amount of time for the spent fuel pool/common pool water temperatures to increase, the temperatures will not immediately reach the maximum allowed temperature (65℃). The amounts of time to reach the maximum allowed temperature (65℃) are as follows.
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