*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 feed water system was initiated.
- From 3:37 pm on March 25, we started injecting freshwater. We are now 
  injecting freshwater by a motor driven pump powered by the off-site 
  transmission line at 6 m3/h.
- As it is suspected that hydrogen gas is 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 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.
- From 11:33 am on May 29, as a part of work to switch the water injection
  line to the reactor from the fire extinction system to the reactor feed
  water system, we started water injection through the reactor feed water
  system in addition to through the fire extinction system.
  At 11:33 am on May 29, we started the water injection to the reactor 
  through the feed water system piping arrangement at the flow rate of 
  approximately 5 m3/h, and changed the flow rate of the fire extinction 
  system from approximately 7 m3/h to 2 m3/h at 12:01 am on May 30. 
  The current rate of water injection is approximately 2 m3/h through the 
  fire extinction system piping arrangement and approximately 5 m3/h 
  through the reactor feed water system. 

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 approximately 13.5 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 happened. 

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 happened. 

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 happened. 

Operation for cooling the spent fuel pools 
- From 11:10 am to 3:35 pm on May 29, we conducted freshwater injection to 
  the spent fuel pool of Unit 1 by a temporary motor driven pump.
- 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.
  Since May 27, we have started spraying dust inhibitor to Unit 1's turbine
  building. We will implement spraying the dust inhibitor to other 
  buildings including Unit 1 to 4's turbine buildings as well as reactor 
  buildings one by one.
- Since 10:08 am on April 19, we had been transferring high level 
  radioactive wastewater from the vertical shaft near the turbine building 
  of Unit 2 to the Centralized Radiation Waste Treatment Facility. At 4:01 
  pm on May 26, a transferring operation was stopped.
- At 2:00 pm on May 1, we started transferring the accumulated water in 
  turbine building of Unit 6 to temporary tanks.
- At 11:00 am on May 10, we started transferring the accumulated water 
  from the underground level of reactor building to the radiation waste 
  treatment facility of Unit 6.
- Since 6:04 pm on May 17, we had been transferring high level radioactive 
  waste water from the underground level of the turbine building of Unit 3 
  to the Centralized Radiation Waste Treatment Facility, but the transfer 
  was suspended due to an inspection on transmission lines and buildings 
  at 9:10 am, on May 25.
- We will continue to take all measures to ensure the safety and to 
  continue monitoring the surrounding environment around the power station.