*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. 3.5m3/h through reactor feed water
 system piping arrangement.
-We commenced injection of nitrogen gas into Primary Containment Vessel at
 1:31am 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.
 At 6:27 pm on June 23, we changed the water injection line so that we can
 inject water to Unit 1 and 2 by the motor driven pump for Unit 1 and
 stopped the motor driven pump for Unit 2. 
 Water is currently injected at approx. 3.5m3/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 m3/h through reactor feed water
 system piping arrangement.

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 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.

Others 
-At 1:30 pm on April 26, we started spraying the dust inhibitor inside the
 site. 
-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 June17, we started operation of water treatment of
 accumulated water at accumulated water treatment facility. 
-At 9:56 am on June 22, we started transferring accumulated water in
 turbine building of Unit 2 to central waste treatment facility building.
-At 8:56 am on June 30, we started transferring the accumulated water from
 the basement of the turbine building of Unit 3 to Centralized Radiation
 Waste Treatment Facility (Process Building).
-At 9:00 am on June 30, since the storage tank of the water desalination
 system was filled up with the water*, we stopped the water desalination
 system to treat the concentrated saltwater in the storage tank of the
 system. At 3:52 pm on July 1, since we were ready to use another tank*,
 we restarted the system.
  *We'd published that the reason the water desalination system had 
    stopped was to treat the concentrated saltwater in the storage tank 
    of the system at the plant status from 10:00 am June 30 to 10:00 am 
    July 2. Now we revised the reason as underlined. 
-At 7:27 am on July 1, we stopped injecting treated water and started
 injecting only filtrate water, for the installation of the tank (buffer
 tank) for injection to the reactor 
-At 10:00 am on July 1, we started transferring of low radioactive stored
 water from outdoor temporary tank to Mega Float. 
-At 10:00 am on July 1, we started transferring of accumulated water from
 inside of turbine building of Unit 6 to temporary tank.
-From 11:43 am to 4:36 pm on July 1, we conducted cleaning up the first
 floor of Unit 3 Reactor Building using a robot.
-From 10:59 am to 12:14 pm on July 2, we conducted measurement of the 
 radiation dose at the first floor Unit 3 Reactor Building using robot to 
 check the cleaning effect the day before. 
-At 10:30 am on July 2, we stopped the accumulated water treatment system 
 to exchange Cesium adsorption Instruments, and restarted the system at 
 1:45 pm. 
-We will continue to take all measures to ensure the safety and to
 continue monitoring the surrounding environment around the power station.