*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 12. It was assumed to be hydrogen explosion.
-At approximately 2:30 am on March 23, seawater injection to the reactor
 through the reactor feed water system was initiated.
-From 3:37 pm on March 25, we started injecting freshwater by a motor
 driven pump powered by the off-site transmission line. We are now
 injecting freshwater by a motor driven pump powered by the off-site
 transmission line.
 The current rate of water injection is approx. 5 m3/h through reactor
 feed water system piping arrangement.
-As it was suspected that hydrogen gas had been accumulated inside Primary
 Containment Vessel, we commenced the valve opening operation concerning
 injection of nitrogen gas into the primary containment vessel at 10:30 pm
 on April 6 and commenced injection at 1:31am April 7. 

Unit 2 (Shut down)  
-At approximately 6:00 am on March 15, an abnormal noise began emanating
 from nearby Pressure Suppression Chamber and the pressure within the
 chamber decreased. 
-From 10:10 am on March 26, we started injecting freshwater to the reactor
 and are now injecting freshwater by a motor driven pump powered by the
 off-site transmission line. 
 The current rate of water injection is approx. 5 m3/h through the reactor
 feed water system piping arrangement. 

Unit 3 (Shut down)  
-Explosive sound and white smoke were confirmed at approximately 11:01am
 on March 14. It was assumed to be hydrogen explosion.
-From 6:02 pm on March 25, 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.
 The current rate of water injection is approx. 11.5 m3/h through the
 reactor feed water system piping arrangement. 

Unit 4 (Outage due to regular inspection)  
-At approximately 6:00 am on March 15, we confirmed the explosive sound
 and the sustained damage around the 5th floor rooftop area of Reactor
 Building.
-At this moment, we do not consider any reactor coolant leakage inside the
 primary containment vessel has occurred. 

Unit 5 (Outage due to regular inspection)  
-Sufficient level of reactor coolant to ensure safety is maintained.
-At 5:00 am on March 19, we started the Residual Heat Removal System Pump
 (C) in order to cool the spent fuel pool.
-At 2:30 pm on March 20, the reactor achieved cold shutdown. 
-At this moment, we do not consider any reactor coolant leakage inside the
 primary containment vessel has occurred. 

Unit 6 (Outage due to regular inspection)  
-Sufficient level of reactor coolant to ensure safety is maintained.
-At 10:14 pm on March 19, 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 20, the reactor achieved cold shutdown. 
-At this moment, we do not consider any reactor coolant leakage inside the
 primary containment vessel has occurred. 

Operation for cooling the spent fuel pools  
-At 5:21 pm on May 31, we started cyclic cooling of the spent fuel pool in
 Unit 2 using alternative cooling system for fuel pool cooling and
 filtering system. 
-From 4:36 pm to 9:00 pm on June 13, we injected water to Unit 4 by
 concrete pumping vehicle (From 4:38 am to 7:15 pm, hydrazine
 [corrosion inhibitor] was also injected at the same time).
-We will continuously conduct further water spray depending on the
 conditions of spent fuel pools, if needed. 

Others  
-At 1:30 pm on April 26, we started spraying the dust inhibitor inside the
 site. On May 27, we started spraying dust inhibitor to Turbine Building
 of Units 1. We will implement spraying the dust inhibitor to other
 turbine and reactor buildings of Units 1 to 4.
-At 2:00 pm on May 1, we started transferring accumulated water in the
 turbine building of Unit 6 to temporary tanks.
-At 11:00 am on May 10, we started transferring accumulated water from the
 underground level of reactor building to the radiation waste treatment
 facility of Unit 6.
-At 6:39 pm on June 4, we started transferring accumulated water from
 vertical shafts (trenches) of turbine building of Unit 2 to Process Main
 Building.
-At 10:05 am on June 14, we started transferring the accumulated water in 
 the turbine building of Unit 3 to Centralized Radiation Waste Treatment 
 Facility (Process Main Building).  
-At 12:42 pm on June 11, we started to operate local exhausters in order
 to improve inside environment of Unit 2 Reactor Building.
-From 2:58 pm on June 13 to 5:43 pm on the same day, we transferred
 accumulated water from the condenser of Unit 1 to the Turbine Building
 of the same Unit.
-At approximately 10:00 am on June 13, we started the operation of the
 circulating seawater purification facility installed at the screen area
 of Unit 2 and 3.
-We will continue to take all measures to ensure the safety and to
 continue monitoring the surrounding environment around the power station.