*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 which is now powered by the off-site transmission line. 
  Water is currently injected at approx. 3.9m3/h through feed water system 
  piping arrangement.
- We commenced injection of nitrogen gas into Primary Containment Vessel at 
  1:31am on 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 fresh water by a motor driven pump powered by the 
  off-site transmission line. From 2:25pm on July 17, the motor driven pump 
  of Unit 2 is injecting the freshwater to the Unit 1 and 2 reactors.
  Water is currently injected at approx. 3.6m3/h through feed water system 
  piping arrangement.
- At 8:06 pm on June 28, we started injecting nitrogen gas into the Primary 
  Containment Vessel. 

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.
  Water is currently injected at approx. 9.0m3/h through reactor feed water 
  system piping arrangement.
- At 8:01 pm on July 14, injection of nitrogen gas into the Primary 
  Containment Vessel started. 

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 2:45 pm on July 15, we started the operation of the original Residual
  Heat Removal System Pump (B).
- 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. (Hydrazine (corrosion inhibitor) was also injected from 
  12:29 am to 1:27 pm on July 25, 2011, ) 
- At 7:47 pm on June 30, we started cyclic cooling of the spent fuel pool 
  in Unit 3 using alternative cooling system for fuel pool cooling and 
  filtering system.
- We will continuously conduct further water spray depending on the 
  conditions of spent fuel pools, if needed. 

Others 
- 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 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.
- From 8:00 pm on June 17, we started operation of water treatment of 
  accumulated water at accumulated water treatment facility. 
- At 6:00 pm on July 2, we started the circulating injection cooling to 
  inject the water, which was treated by the accumulated water treatment 
  system, to the reactors through the buffer tank.
- At 4:53 pm on July 22, we started transferring accumulated water at Unit 
  3 turbine building vertical shaft to the Centralized Radiation Waste 
  Treatment Facility (Process Main Building).
- At 4:56 pm on July 22, we started transferring accumulated water at Unit 
  2 turbine building vertical shaft to the Centralized Radiation Waste 
  Treatment Facility (Process Main Building).
- From 10:37 am to 3:20 pm on July 24, in order to decrease the radiation 
  dose in the 5th floor in the reactor building of Unit 4, we conducted to 
  inject fresh water into the reactor well and the drier separator pit of 
  the Unit.
- From 11 am to 4 pm on July 24, we transferred accumulated water from the 
  turbine building of Unit 6 to the temporary tank.
- At around 11:57 am on July 24, water desalinations were automatically 
  shut-downed after annunciator alarmed. From 7:19 pm on the same day, the 
  water desalinations were restarted after switching to the spare 
  equipment. The water injection into Reactors of Unit 1 to 3 is continued 
  without interruption. 
- There was an earthquake of magnitude 6.2 (on the Richter scale) whose 
  epicenter was Fukushima offshore at around 3:51 am on July 25, however, 
  no abnormality was observed on water injection into the reactors of Unit 
  1 to 3, the nitrogen injection gas into PCVs of Unit 1 to 3, the 
  operation of water treatment facility, operation of cyclic cooling of the 
  spent fuel pool in Unit 2 and 3 using alternative cooling and filtering 
  system and so on. There were also neither abnormality on major plant 
  parameter of each unit nor injuries. The indicated values at monitoring 
  posts on the boundary of power station's premise are within a normal 
  movement range.
- We will continue to take all measures to ensure the safety and to 
  continue monitoring the surrounding environment around the power station.