*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.
   The current water injection amount from the reactor feed water system is 
   approx.4.6 m3/h and that from the core spray system is approx. 2 m3/h.
 - 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 
   feed water system, we started water injection from piping of core spray 
   system to the reactor. 
   To improve reliability of water injection to the reactors, the injection 
   line connecting to the reactor injection pump on the hill was replaced 
   with polyethylene pipes and we have been changing the route for reactor 
   injection from feed water system to reactor core spray system in a 
   stepwise manner. After completion of adjusting water flow amount as 
   planned on February 2, tendency of temperature rise at the bottom of PCV 
   was observed. Thus, at 7:20 pm on February 3, 2012, we changed the 
   injection amount into Unit 2 reactor through feed water system from 
   approx. 2.9 m3/h to approx. 4.9 m3/h and changed that though reactor 
   core spray system from approx. 5.8 m3/h to approx. 3.8 m3/h (which means 
   setting them at those of before flow adjustment on February 1, 2012). 
   After that, we have observed the tendency of temperature at the upper 
   head of the bottom of PCV. Because we found the temperature has risen 
   again (approximate 66.1 °C at 11:00 pm on February 4), at 12:52 am on 
   February 5, we changed the water injection volume to Unit 2 reactor 
   through the feed water system from approx. 4.8 m3/h to approx. 5.8 m3/h 
   (the water injection through the reactor core spray system remains 
   approx. 3.8 m3/h). At this moment, the temperature indicates approx.  
   68.6 °C (as of 11:00 am on February 5). We will monitor it continuously.
   The current water injection amount from the reactor feed water system is 
   approx.5.8 m3/h and that from the core spray system is approx. 3.8 m3/h.
 - 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. 
 - 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 10:46 am on December 1, 2011, we started the nitrogen injection to 
   the Reactor Pressure Vessel.
 - At 11:50 am on January 19, 2012, we started the operation of the spent 
   fuel pool desalting facility.
   At 10:56 pm on February 4, "Abnormal state (low pressures) in suction 
   pressure of RO high pressure pump" triggered the alarm in the desalting 
   facility for spent fuel pool of Unit 2, and the facility automatically 
   stopped. Because all isolation valves of the system have been closed due 
   to the interlock and the alternative cooling system for spent fuel pool 
   is continuously operated, it does not affect the cooling for the spent 
   fuel pool. In addition, as a result of site check, it was confirmed that 
   any leakage from the facility was not found. The cause is now under 
   investigation. 

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.
   The current water injection amount from the reactor feed water system is 
   approx. 3m3/h and that from the core spray system is approx. 6m3/h.
 - 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. (From 1:24 pm to 3:07 pm on February 3, 
   2012, we injected hydrazine [corrosion inhibitor].)
 - 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.
 - At 3:18 pm on January 14, we started operation of the radioactive 
   material removal instrument for the spent fuel pool in Unit 3 

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. 

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. 

Others 
 - At around 10:00 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 8:00 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.
 - As finding of accumulated water containing 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.
 - At 4:07 pm on February 3, 2012, we started to transfer accumulated water 
   from the basement of T/B, Unit 2 to the Centralized Waste Treatment 
   Facility (Miscellaneous Solid Waste Volume Reduction Treatment Building 
   [High Temperature Incinerator Building] and Process Main Building). 
 - At 9:18 am on January 31, we started transfer of Sub-drain Water of Unit 
   6 to the temporary tank. We will conduct transferring to the temporary 
   tank appropriately.
 - At about 7:10 pm on February 4, a worker of a partner company which 
   operated the water desalinations said he was in bad shape. He was 
   examined and treated at the emergency medical clinic of Unit 5&6 and 
   judged that he required an emergency transfer. Then he was transferred 
   to the J Village at 9:06 pm. After that, at 9:50 pm, he was transferred 
   to Iwaki Kyouritsu Hospital from the J Village. At this moment, the 
   doctors examine and treat. The patient does not have any radiation 
   materials. After the examination by the doctors, the worker went home. 
 - At 9:49 am on February 5, we started water transfer from the basement of 
   turbine building of Unit 3 to Centralized Radiation Waste Treatment 
   Facility (Miscellaneous Solid Waste Volume Reduction Treatment Building 
   [High Temperature Incinerator Building]).