*The 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, 2011. It was assumed to be hydrogen
  explosion.
- At 3:37 pm on March 25, 2011, 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. 
- At 10:11 am on December 10, 2011, in addition to water injection from
  water feeding system, we started water injection from piping of core
  spray system to the reactor.
  Current water injection volume is approx. 4.6 m3/h from the reactor feed
  water system and approx. 1.7 m3/h from the core spray system.
- At 1:31 am on April 7, 2011, we commenced injection of nitrogen gas into
  Primary Containment Vessel.
- At 11:22 am on August 10, 2011, we started cyclic cooling for the water
  in the spent fuel pool by an alternative cooling equipment of the Fuel
  Pool Cooling and Filtering System. 
- On October 28, 2011, we completed installation of the cover for the
  Reactor Building in order to contain dispersion of radioactive
  substances.
- At 4:04 pm on November 30, 2011, we started operation to inject nitrogen
  into the reactor pressure vessel.
- At 6:00 pm on December 19, 2011, a full-scale operation of the PCV gas
  management system started.  

Unit 2 (Shut down) 
- At approximately 6:00 am on March 15, 2011, an abnormal noise began
  emanating from nearby Pressure Suppression Chamber and the pressure
  within the chamber decreased. 
- At 10:10 am on March 26, 2011, 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. 
- At 2:59 pm on September 14, 2011, in addition to water injection from
  water feeding system, we started water injection from piping of core
  spray system to the reactor.
  Current water injection volume is approx. 2.9 m3/h from the reactor feed
  water system and approx. 7.1 m3/h from the core spray system.
- At 5:21 pm on May 31, 2011, we started cyclic cooling for the water in
  the spent fuel pool by an alternative cooling equipment of the Fuel Pool
  Cooling and Filtering System. (We also injected hydrazine (corrosion  
  inhibitor) from 1:38 pm to 3:43 pm on January 10 2012.) 
- At 8:06 pm on June 28, 2011, we started injecting nitrogen gas into the
  Primary Containment Vessel.
- At 6:00 pm on October 28, 2011, a full-scale operation of the PCV gas
  management system started. 
- At 10:10 am on January 11, due to the preparation of inspection of the  
  Primary Containment Vessel(PCV) of Unit 2, we adjusted the amount of 
  nitrogen injected to the PCV from 13 Nm3/h to 10 Nm3/h to reduce the  
  pressure of the inside. The amount of emission from the PCV gas  
  management system was not changed. 
- At 10:46 am on December 1, 2011, we started the nitrogen injection to
  the Reactor Pressure Vessel. 

Unit 3 (Shut down) 
- Explosive sound and white smoke were confirmed at approximately 11:01 am
  on March 14, 2011. It was assumed to be hydrogen explosion.
- At 6:02 pm on March 25, 2011, 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.
- At 2:58 pm on September 1, 2011, we started water injection by core
  spray system in addition to water injection by the reactor feed water
  system piping arrangement. 
- At 10:18 am on January 11, because of the replacement work of the water  
  injection piping arrangement from the water feed system in association  
  with the commissioning of reactor injection pump in Turbine Building of 
  Unit 3, we have controlled the amount of injected water to the reactor  
  gradually. The amount of injected water to the reactor of Unit 3 from  
  the reactor feed water system was adjusted from approx. 1.9 m3/h to  
  approx. 1.0 m3/h, and the amount from the core spray system was adjusted  
  from approx. 7.0 m3/h to approx. 8.0 m3/h.  
  Current water injection volume is approx 1.0 m3/h from the reactor feed
  water system and approx. 8.0 m3/h from the core spray system.
- At 7:47 pm on June 30, 2011, we started cyclic cooling for the water in
  the spent fuel pool by an alternative cooling equipment of the Fuel Pool
  Cooling and Filtering System.
- At 8:01 pm on July 14, 2011, injection of nitrogen gas into the Primary
  Containment Vessel started. 
- At 4:26 pm on November 30, 2011, we started operation to inject nitrogen
  into the reactor pressure vessel. 

Unit 4 (Outage due to regular inspection) 
- At around 6 am on March 15, 2011, we confirmed the explosive sound and
  the sustained damage around the 5th floor rooftop area of Reactor
  Building.
- At 12:44 pm on July 31, 2011, we started cyclic cooling for the water in
  the spent fuel pool by an alternative cooling equipment of the Fuel Pool
  Cooling and Filtering System.
- At 10:58 am on November 29, 2011, in order to decrease more salinity, we
  installed Ion exchange equipment and started the operation of such
  equipment.
- 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 5:00 am on March 19, 2011, we started the Residual Heat Removal
  System Pump in order to cool the spent fuel pool.
- At 2:45 pm on July 15, 2011, we started the operation of the original
  Residual Heat Removal System (System B) by its original seawater pump.
- At 10:11 am on December 22, 2011, since we finished the recovery work of
  seawater pump (System B) of equipment water cooling system, we made a
  trial run. At 11:25 am on the same day, we confirmed no abnormalities
  and restarted the operation.
- At this moment, we don't think there is any reactor coolant leakage
  inside the primary containment vessel.
- At 2:39 pm on January 11, to protect the decline of facilities which are  
  needed to maintain the stable cold shutdown and improve the  
  high-humidity environment in the Reactor Building of Unit 5, we started  
  up ventilation and air-conditioning system in the building. This air  
  conditioning system inlet and outlet air by high-efficiency particle  
  filter. 

Unit 6 (Outage due to regular inspection) 
- Sufficient level of reactor coolant to ensure safety is maintained.
- At 10:14 pm on March 19, 2011, we started the Residual Heat Removal
  System Pump of Unit 6 to cool down Spent Fuel Pool.
- At 2:33 pm on September 15, 2011, we started separately cooling the
  reactor through the Residual Heat Removal System and the spent fuel pool
  through Equipment Cooling Water System and Fuel Pool Cooling System.
- At this moment, we do not think there is any reactor coolant leakage
  inside PCV. 

Injured and others 
- At 2:22 pm on January 9, 2012, at the Spent Sludge Storage Facility (*)
  which is under construction, a partner company's worker who had been
  engaged in concrete placement work reported his physical disorder. He
  was carried to the emergency medical room of Unit 5/6 and received
  medical treatment. Because he was in cardiopulmonary arrest, he was
  carried from Fukushima Daiichi Nuclear Power Station to Iwaki Kyouritsu
  Hospital at 3:25 pm. No radioactive materials were found to be attached
  to the worker's body.
- At around 1 pm on January 11, we were reported from the partner company  
  that his death was confirmed by a doctor at 5:02 pm on January 9. 

* Spent Sludge Storage Facility: The facility to store radioactive waste
  (spent sludge), which is produced during the process of accumulated
  water treatment, on a temporary basis. 

Others 
- At around 10 am on June 13, 2011, we started the operation of the
  circulating seawater purification facility installed at the screen area
  of Unit 2 and 3.
- At 8 pm on June 17, 2011, 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 7:41 pm on August 19, 2011, we started treatment of accumulated water
  by parallel operation of one line from the cesium adsorption instrument
  to the decontamination instrument and the other treatment line of the
  cesium adsorption instrument No.2.
- At 2:06 pm on October 7, 2011, we started to spray purified accumulated
  water brought from Unit 5 and 6 continually in order to prevent dust
  scattering and potential fire outbreaks from the cut down trees.
- On October 28, 2011, we started installation of the water proof wall at
  the sea side, in front of the existing shore protection, Units 1-4, in
  order to contain marine pollution by underground water.
- At 12:25 pm on December 13, 2011, we started the re-circulating
  operation of desalination facility (reverse osmosis membrane type) for
  the purpose of suppression of condensed water after desalination
  treatment.
- From 8:17 am on January 10, 2012, we started to transfer accumulated
  water from the basement of the turbine building of Unit 2 to the
  Centralized Radiation Waste Treatment Facility, the Process Main
  Building.
- At 9:47am on January 11 2012, we started to transfer accumulated water
  from the On-site Bunker Building of the Central Radiation Water
  Treatment Facility to the Process Main Building.
- Because of the finding of accumulated water included radioactive  
  materials at the trench between the Process Main Building and the  
  Miscellaneous Solid Waste Volume Reduction Treatment Building[High  
  Temperature Incinerator Building](December 18, 2011), we started the  
  inspection of other trenches at the site on January 11.