*Updates are underlined
 
All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.
 
Unit 1(Shut down) 
-Explosive sound and white smoke were confirmed after the big quake
 occurred at 3:36 pm on March 12th. It was assumed to be hydrogen
 explosion.
-At approximately 2:30 am on March 23rd, seawater injection to the nuclear
 reactor through the feed water system was initiated.
-From 3:37 pm on March 25th, we started injecting freshwater and are now
 injecting fresh water by a motor driven pump powered by the off-site
 transmission line.
-As it is suspected that hydrogen gas is accumulated inside reactor
 containment vessel, we commenced the valve opening operation concerning
 injection of nitrogen gas into the reactor container vessel at 10:30 pm
 April 6th and commenced injection at 1:31am April 7th.
 
Unit 2(Shut down) 
-At approximately 6:00 am on March 15th, an abnormal noise began emanating
 from nearby Pressure Suppression Chamber and the pressure within the
 chamber decreased. 
-From 10:10 am on March 26th, we started injecting freshwater to the
 reactor and are now injecting fresh water by a motor driven pump powered
 by the off-site transmission line.
 
Unit 3(Shut down) 
-Explosive sound and white smoke were confirmed at approximately 11:01am
 on March 14th. It was assumed to be hydrogen explosion.
-From 6:02 pm on March 25th, we started injecting fresh water to the
 reactor and are now injecting fresh water by a motor driven pump powered
 by the off-site transmission line.
 
Unit 4(outage due to regular inspection) 
-At approximately 6:00 am on March 15th, we confirmed the explosive sound
 and the sustained damage around the 5th floor rooftop area of the Nuclear
 Reactor Building.
-At this moment, we do not consider any reactor coolant leakage inside the
 reactor happened.
 
Unit 5(outage due to regular inspection) 
-Sufficient level of reactor coolant to ensure safety is maintained.
-At 5:00 am on March 19th, we started the Residual Heat Removal System
 Pump (C) in order to cool the spent fuel pool.
-At 2:30 pm on March 20th, the reactor achieved reactor cold shutdown. 
-At this moment, we do not consider any reactor coolant leakage inside the
 reactor happened.
 
Unit 6(outage due to regular inspection) 
-Sufficient level of reactor coolant to ensure safety is maintained.
-At 10:14 pm on March 19th, we started the Residual Heat Removal System
 Pump (B) of Unit 6 in order to cool the spent fuel pool.
-At 7:27 pm on March 20th, the reactor achieved reactor cold shutdown.
-At this moment, we do not consider any reactor coolant leakage inside the
 reactor happened.
 
Operation for cooling the spent fuel pools 
-From 5:08 pm on April 20th, we started spraying water to Unit 4 by the 
 concrete pumping vehicle. 
-We will conduct further water spray depending on the conditions of spent
 fuel pools, if needed.
 
Others 
-The national government has instructed evacuation for those local
 residents within 20km radius of the periphery and shelter in place for
 those residents from 20km to 30km radius of the periphery, because it is
 possible that radioactive materials are discharged.
-At 10:08 am on April 19th we started transferring high level radioactive
 wastewater to the Centralized Radiation Waste Treatment Facility.
-From 11:30am to 2:00pm, we opened and closed the double doors and
 conducted surveys of the situation of the inside of the nuclear reactor
 building of Unit 3 and measured a dose of radiation, etc. by a remote
 control robot. Also, from 4:00pm to 5:30pm, we did the same kind of work
 on Unit 1. From 1:42pm to 2:33pm on April 18th, we opened and closed the
 double doors, measured a dose of radiation and so on, and conducted
 surveys of the situation of the inside of the nuclear reactor building of
 Unit 2, by a remote control robot.
-We will continue to take all measures to ensure the safety and to
 continue monitoring the surrounding environment around the power station.