Foundation, Concrete and Earthquake Engineering

Major Events of Fukushima Dai-ichi Nuclear Power Station Unit 2 After Earthquake (1/4/2011 Update)

The massive 9.0-magnitude quake and the tsunami on 11 March have killed more than 11,000 people, with at least 16,700 people still missing across north-eastern Japan along with a massive Nuclear crisis. Major events of Fukushima Dai‐ichi Nuclear Power Station Unit 2 upto today are:

11th 14:46 Under operation, Automatic shutdown by the earthquake

11th 15:42 Report based on the Article 10 (Total loss of A/C power)

11th 16:36 Occurrence of the Article 15 event (Inability of water injection of the Emergency Core Cooling System )

 13th 11:00 Started to vent.

14th 13:25 Occurrence of the Article 15 event (Loss of reactor cooling functions)

14th 16:34 Started to inject water to the Reactor Core.
A partial meltdown of fuel rods caused high levels of radioactivity in a water leak at the No 2 reactor

14th 22:50 Occurrence of the Article 15 event (Unusual rise of the pressure in PCV)

15th 00:02 Started to vent.

15th 06:10 Sound of explosion
The leak was detected in a tunnel linked to the No 2 reactor

15th around 06:20 Possible damage of the suppression chamber

20th 15:05~17:20 Approximately 40 ton seawater injection to the Spent Fuel Pool (SFP) via the Fuel Pool Cooling Line (FPC)

20th 15:46 Power Center received electricity.

21st 18:22 White smoke generated. The smoke died down and almost invisible at 07:11 March 22nd.

22nd 16:07 Injection of around 18 tons of seawater to SFP

25th 10:30~12:19 Sea water injection to SFP via FPC

26th 10:10 Started to inject fresh water to the Reactor Core.

26th 16:46 Lighting in the Central Control Room was recovered.
On March 23, white smoke billowing from a window in the No. 2 reactor building at the Fukushima Daiichi nuclear power plant 
27th 18:31 Switched to the water injection to the core using the temporary motor‐driven pump.

29th 16:30 ~18:25 Switched to the temporary motor‐driven pump injecting fresh water to SFP.

30th 9:25~23:50 Confirmed malfunction of the temporary motor‐driven pump injecting fresh water to SFP(9:45). Switched to the injection using the fire pump Truck, but suspended as cracks were confirmed in the hose. (12:47, 13:10) Resumed injection of fresh water(19:05)

31st 12:00 Started to transfer the stagnant water from the Condensate Storage Tank (CST) to the Surge Tank of Suppression Pool Water (SPT)

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