*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. 
 Water is currently injected at approx. 3.7m3/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. From 2:25pm on July 17, the motor driven pump 
 of Unit 2 is injecting the freshwater to the Unit 1 and 2 reactors.
 Water is currently injected at approx. 3.4m3/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. 9.0m3/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 6:00 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 2:45 pm on July 15, we started the operation of the original Residual 
 Heat Removal System Pump (B).
-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. 

Injury accident 
-Around 10:06 am on July 18, a worker of the partner company fell from the 
 distribution pole during the connection work of the optical cable near 
 the observatory entrance of the station. He was transported to the Iwaki 
 Kyouritsu Hospital by the helicopter emergency medical service (called 
 "Doctor Heli"). According to the result of physical examination, he was 
 diagnosed as "fracture of distal end of right radius, of left radius head, 
 and left ligamentum collaterale ulnae." 

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 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 June 17, we started operation of water treatment of 
 accumulated water at accumulated water treatment facility. 
-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 10:50 am on July 16 to 3:59 pm on July 21, we transferred of the 
 accumulated water from the Turbine Building of Unit 3 to the Process Main 
 Building of the Centralized Radiation Waste Treatment Facility.
-From 10:56 am on July 16 to 4:04 pm on July 21, we transferred of the 
 accumulated water from the Turbine Building of Unit 2 to the Process Main 
 Building of the Centralized Radiation Waste Treatment Facility.
-From 8:30 am on July 18, we started an installation work of a temporary 
 roof for the Unit 3 turbine building in order to cover the roof's opening 
 as a measure for rainwater.
-On July 21, in order to conduct a restoration work for double circuit of 
 Yonomori line which is power source for Unit 5 and Unit 6, we started a 
 power switching work to stop the operation of Okuma Line No.3 which was 
 connected to Yonomori Line No.1. According to this work, we stopped the 
 alternative cooling system for the fuel pool cooling and filtering system 
 of Unit 3 at 8:02 am, the water treatment system at 8:38 am, and the 
 cooling system for the common pool at 8:40 am. After that, upon starting 
 of power receiving from Okuma Line No.2, we started the cooling system 
 for the common pool at 2:41 pm, and the alternative cooling system for 
 the fuel pool cooling and filtering system of Unit 3 at 2:52 pm. At 12:28 
 am on July 22, we started the operation of the water treatment facility, 
 resuming water processing at 12:40 am on the same day. 
-At 7:10 am on July 22, the circuit breaker for the bus from Okuma line 2L 
 which supplies electricity to a part of power network in the power 
 station opened the circuit due to overload, resulting in the power off of 
 the following facilities: the alternative cooling facility for spent fuel 
 pool at Unit 3, water treatment facilities, the cooling facility of 
 common pool, monitoring gauges in the reactor of Unit 3 & 4, and Main 
 Anti-Earthquake Building. The following facilities which receive power 
 from other system had no affect: water injection and nitrogen gas 
 injection to reactor of each unit, each monitoring post, the alternative 
 cooling facility for spent fuel pool at Unit 2, monitoring gauges in the 
 reactor of Unit 1 & 2, all facilities of unit 5 & 6. Currently 
 investigations of the cause of the event as well as power restoration 
 work are underway. 
-We will continue to take all measures to ensure the safety and to 
 continue monitoring the surrounding environment around the power station.