*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. 
- At 8:13 am on July 4, we adjusted injection rate from feed water system 
  piping arrangement to approximately 3.8m3 since decrease in amount of 
  water injection was confirmed. 
- Water is currently injected at approx. 3.8m3/h through reactor feed water 
  system piping arrangement.
- We commenced injection of nitrogen gas into Primary Containment Vessel 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. 
  At 6:27 pm on June 23, we changed the water injection line so that we can 
  inject water to Unit 1 and 2 by the motor driven pump for Unit 1 and 
  stopped the motor driven pump for Unit 2. 
  Water is currently injected at approx. 3.5m3/h through reactor 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 m3/h through 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. 
- 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 1:30 pm on April 26, we started spraying the dust inhibitor inside 
  the site. 
- 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 June17, we started operation of water treatment of 
  accumulated water at accumulated water treatment facility. 
- At 9:56 am on June 22, we started transferring accumulated water in 
  turbine building of Unit 2 to central waste treatment facility building.
- At 8:56 am on June 30, we started transferring the accumulated water 
  from the basement of the turbine building of Unit 3 to Centralized 
  Radiation Waste Treatment Facility (Process Building).
- 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.
- From 10:00 am on July 1 to 4:00 pm on July 3, we transferred low 
  radioactive stored water from outdoor temporary tank to Mega Float. 
- From 10:00 am on July 1 to 4:00 pm on July 3, we transferred accumulated 
  water from inside of turbine building of Unit 6 to temporary tank. We 
  restarted the transfer at 10 am on July 4. 
- At 9:13 am on June 4, we started freshwater injection to reactor well 
  and temporary storage pool of unit 4 to reduce radioactivity 
  concentration of the turbine building 5th floor. 
- We will continue to take all measures to ensure the safety and to 
  continue monitoring the surrounding environment around the power station.