*New items 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. 3.6 m3/h through reactor 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.
  Water is currently injected at approx. 3.5 m3/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. 8.9 m3/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 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 don't think there is any reactor coolant leakage
  inside the primary containment vessel. 
 
Unit 5 (Outage due to regular inspection) 
- Sufficient level of reactor coolant to ensure safety is maintained.
- At 5 am on March 19, we started the Residual Heat Removal System Pump 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 time, we don't think there is any reactor coolant leakage inside
  the primary containment vessel. 
 
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 of Unit 6 to cool down Spent Fuel Pool.
- At 7:27 pm on March 20, the reactor achieved cold shutdown. 
- At this time, we don't think there is any reactor coolant leakage inside
  the primary containment vessel.
- From 9:30 am on August 9, we initiated plumbing between temporary pump 
  and residual heat removal system pump (A) to enforce the connection 
  method. We stopped the power source of residual heat removal system pump 
  (B) during this work. Even though cooling of a reactor and a spent fuel 
  pool were temporarily suspended, there are no safety issues regarding 
  this. 
 
Operation for cooling the Spent Fuel Pools 
- At 5:21 pm on May 31, we started cyclic cooling of Spent Fuel Pool of
  Unit 2 by using alternative cooling system of the Pool's cooling and
  filtering system.
- At 7:47 pm on June 30, we started cyclic cooling of Spent Fuel Pool of
  Unit 3 by using alternative cooling system of the Pool's cooling and
  filtering system.
- At 0:44 am on July 31, we started cyclic cooling of Spent Fuel Pool of
  Unit 4 by using alternative cooling system of the Pool's cooling and
  filtering system. 
 
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 around 10 am on June 13, we started the operation of the circulating
  seawater purification facility installed at the screen area of Unit 2
  and 3.
- At 8:00 pm on June 17, we started operation of Water Treatment Facility
  against the accumulated water. 
- 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 7:09 am on August 4, we started transferring accumulated water at
  Unit 2 turbine building to Centralized Radiation Waste Treatment
  Facility.
- At 8:42 am on August 5, we started transferring accumulated water at
  Unit 3 turbine building to Centralized Radiation Waste Treatment
  Facility.
- At 4:11 pm on August 7, we completed commissioning of additional two
  evaporative condensation facilities to the water treatment facility to
  make freshwater from condensed seawater from desalination facility. We
  put those additional facilities to full-scale operation.
- From 10:00 am to 5:00 pm on August 8, we transferred low level
  accumulated water from outdoor temporary tanks to Mega Float.
- From11:00am to 4:00 pm on August 8, we transferred accumulated water
  from the turbine building of Unit 6 to a temporary tank. 
- At 8:20 pm on August 8, water treatment facility has stopped due to the 
  water level gauge's error alarm of SPT tank. Subsequently, we confirmed 
  no problems with Water Treatment Facility and the facility has started 
  at 10:22 pm on the same day and resumed operation at 10:45 pm. 
- At 1:50 am on August 9, an alarm showed low level of water at waste RO 
  supply tank and water desalinations automatically stopped. Water 
  desalinations reinitiated at 9:35 on the same day after the confirmation. 
  Water injection to reactors of unit 1, 2, and 3 are ongoing. 
- At 10:00 am on August 9, we started transferring low level accumulated 
  water from outdoor temporary tanks to Mega Float.