*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. 4.7 m3/h and that from the core spray system is approx. 1.8 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. 
 With regard to the water injection volume for Unit 2 reactor, which was 
 increased with temperature figure raising, we adjusted the original 
 volume before temperature increasing (Feed water system: approx. 3.0m3/h, 
 core spray system: approx. 6.0m3/h). At 6:40 pm on February 19, we 
 changed the water injection volume from core spray system from approx. 
 10.0m3/h to 6.0m3/h (The water injection level from feed water system is 
 continuing at approx. 7.6m3/h) 
 The current water injection amount from the reactor feed water system is 
 approx.7.7m3/h and that from the core spray system is approx.6.1m3/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 around 7:05 am on February 18, within the Unit 2 SFP alternative 
 cooling system, an alarm sounded showing that the water flow difference 
 was large at the gateway of primary system pump and the system 
 automatically shutdown. After that, we confirmed there was no 
 abnormalities such as leakage at the location where the primary system 
 shutdown. However, as temperature decreased in the outer temperature, the 
 secondary system cooing water temperature also decreased and it may 
 freeze, with a view toward facility protection, we resumed it so as to 
 prevent the primary and secondary system from freezing. Upon resumption, 
 we made sure there were no leakage or parameter abnormalities, and by 
 releasing the alarm at 11:54 pm on February 18, we activated the system. 
 Since we do not see any abnormalities, operation of the system is still 
 continuing. 
-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 
 control system started. 
 At 12:00 pm on February 19, since we finished to check out noble gas 
 monitoring of the PCV gas controlling system of Unit 2, we started 
 operation(sampling data of noble gas) . At 3:30pm on February 19, we 
 started continuous monitoring for the controlling system. 
-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 around 5:00 am on February 8, the alarm which indicates the abnormally 
 low suction pressure of the high pressure RO pump in the desalination 
 apparatus of Unit 2 spent fuel pool went off and the device was 
 automatically shut down. The interlock closed all the isolation valves in 
 the system and the alternative cooling system for the spent fuel pool was 
 activated so there was no interruption to the cooling process. We also 
 confirmed that there was no leakage from the apparatus. Due to the 
 investigation afterwards we assumed that an instantaneous fall in the 
 pressure had caused this shut down. After we confirmed that certain 
 measures have been taken to prevent this we restarted the operation at 
 3:20 pm of February 18, but at 7:05 pm on the same day another alarm 
 which indicates that the difference of the water flow between the 
 entrance and the exit of the primary line pump of the substitutive 
 cooling system of the spent fuel pool of unit 2 went off and the system 
 shut had down automatically. Due to this the desalting facility has also 
 shut down, but later we reactivated the system and at 10:44 am on 
 February 19 we restarted the operation of the desalting facility. 
 
 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. 1.9 m3/h and that from the core spray system is approx. 5 m3/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. 
-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. 
 
 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. 
-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 2:43 pm on February 10, we started to transfer accumulated water from 
 underground floor of turbine building of Unit 2 to centralized radiation 
 waste treatment facility (Miscellaneous Solid Waste Volume Reduction 
 Treatment Building [High Temperature Incinerator Building]).At 9:17 am on 
 February 20, due to switching the transfer pumps, we transferred the 
 accumulated water at the basement of Unit 2 Turbine Building to 
 Centralized Waste Treatment Facility (Miscellaneous Solid Waste Volume 
 Reduction Treatment Building [High Temperature Incinerator Building]) 
 stopped. At 9:39 am on February 20, the transfer restarted. 
-From 10:00 am to 4:00 pm on February 18, we transferred accumulated water 
 from the turbine building of Unit 6 to the temporary tank. At 10:00 am on 
 February 20, we started to transfer. 
-At 3:04 pm on February 19, we confirmed the water leakage at the flange 
 of header valve of water feeding line. The leaked water was filtrate 
 water and the amount was approx. 20L. At 3:55 pm on February 19, the 
 valve of upper stream was closed, and the water leakage was stopped. The 
 radiation dose in ambient air near the leaking point was almost same as 
 that of background. As the result of sampling of leaked water, we 
 confirmed that the sample data of Cesium-134 and Cesium-137 were below 
 measurable limit. In order to prevent the leakage from the surrounding 
 gutter, at 4:20 pm on February 19, we finished piling up the sandbags. 
 After then, we confirmed that the gutter which sandbags piled on was dry, 
 and no water leakage happened to the ocean. 
-At 8:35 am on February 20, since the amount of disposed water in the 
 Second Cesium Adsorption instruments decreases gradually, we suspended 
 the system for cleaning. 
-At 9:30 am on February 20, regarding the accumulated water at the 
 basement of Unit 3 Turbine Building, transfer to Centralized Waste 
 Treatment Facility (Miscellaneous Solid Waste Volume Reduction Treatment 
 Building [High Temperature Incinerator Building]) started.