*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 Mar 12th. It was assumed to be hydrogen explosion.
-At approximately 2:30 am on March 23rd, seawater injection to
 the nuclear reactor through the feed water system was initiated.
-At approximately 10:50 am on March 24th, white fog-like steam arising
 from the roof part of the reactor building was observed.
-At approximately 11:30 am on March 24th, lights in the main control room
 was restored. 
-We had been injecting seawater into the reactor, but from 3:37 pm on
 March 25th, we started injecting freshwater.
-At 8:20 am on March 29th, we switched injection of fresh water from
 using fire engine to temporary electrical pump.

Unit 2(Shut down) 
-At approximately 6:00 am on March 15th, an abnormal noise began
 emanating from nearby Pressure Suppression Chamber and the pressure
 within the chamber decreased. 
-At 6:20 pm on March 21st, white smoke was confirmed arising from
 the top of the reactor building. As of 7:11 am on March 22nd, smoke
 decreased to the level to nearly non-existent.
-We have been injecting seawater into the reactor, but from 10:10 am on
 March 26th, we started injecting fresh water (with boric acid).
-At approximately 4:46 pm on March 26th, the light in the main control
 room was restored.
-We had been injecting fresh water in to the reactor utilizing fire
 pump, however, we switched over to utilizing temporary electrical pump
 from 6:31 pm on March 27th.

Unit 3(Shut down) 
-Explosive sound and white smoke were confirmed at 11:01am March 4th.
 It was assumed to be hydrogen explosion.
-At 8:30am on March 16th, fog like steam was confirmed arising from
 the reactor building.
-At approximately 6:15 am on March 17th the pressure of the Suppression
 Chamber has temporarily increased. We were preparing to implement
 measures to reduce the pressure of the reactor containment vessel
 (partial discharge of air containing radioactive material to outside)
 in order to fully secure safety. However, at present, it is not
 a situation to immediately implement measures and discharge air
 containing radioactive material to outside. We will continue to monitor
 the status of the pressure of the reactor containment vessel.
-At approximately 4:00 pm, March 21st, light gray smoke was confirmed
 arising from the floor roof of the Unit 3 building. On March 22nd,
 the color of smoke changed to somewhat white and it is slowly
 dissipating. 
-At approximately 10:45 pm on March 22nd, the light in the main control
 room was turned on.
-At around 4:20 pm on March 23rd, our staff confirmed light black smoke
 belching from the Unit 3 building. At approximately 11:30 pm on
 March 23rd and 4:50 am on March 24th, our employee found no signs
 of smoke.
-We had been injecting sea water into the reactor pressure vessel, but
 from 6:02 pm on March 25th, we started injecting freshwater.
-We had been injecting fresh water in to the reactor utilizing
 fire pump, however, we switched over to utilizing temporary electrical
 pump from 8:30 pm on March 28th.

Unit 4 (outage due to regular inspection) 
-At approximately 6 am on March 15th, we confirmed the explosive sound
 and the sustained damage around the 5th floor rooftop area of
 the Nuclear Reactor Building.
-On March 15th and 16th, we respectively confirmed the outbreak of fire
 at the 4th floor of the northwestern part of the Nuclear Reactor
 Building. We immediately reported this matter to the fire department
 and the related authorities. TEPCO employees confirmed that each fire
 had already died down by itself. 
-At this moment, we do not consider any reactor coolant leakage inside
 the reactor happened.
-At 11:50 am on March 29th, lights in the main control room was 
 restored.

Unit 5 (outage due to regular inspection) 
-Sufficient level of reactor coolant to ensure safety is maintained.
-At 5 am, March 19th, we started the Residual Heat Removal System Pump
 (C) in order to cool the spent fuel pool.
-At 2:30 pm, March 20th, the reactor achieved reactor cold shutdown.
 At around 5:24 pm on March 23rd, when we switched the temporary
 Residual Heat Removal System Seawater Pump, it has stopped
 automatically. At around 4:14 pm, March 24th we replaced the pump, and
 restarted cooling of reactor at around 4:35 pm.
-At this moment, we do not consider any reactor coolant leakage inside
 the reactor happened.

Unit 6 (outage due to regular inspection) 
-Sufficient level of reactor coolant to ensure safety is maintained.
-We completed the repair work on the emergency diesel generator (A).
-At 10:14 pm, March 19th, we started the Residual Heat Removal System
 Pump (B) of Unit 6 in order to cool the spent fuel pool.
-At 7:27 pm, March 20th, the reactor achieved reactor cold shutdown.
-In relation to the two seawater side pumps of the Residual Heat
 Removal System, we switched the power source from temporary to
 permanent at 3:38 PM and 3:42PM, Mar 25 respectively.
-At this moment, we do not consider any reactor coolant leakage inside
 the reactor happened.

Today's work for cooling the spent fuel pools 
-At 2:17 pm on March 29th, water injection to Unit 3 by the concrete 
 pump truck was started. We had been injecting seawater into 
 the reactor, but hereafter we started injecting freshwater. 
-We are considering further spraying subject to the conditions of spent
 fuel pools.

Casualty 
-Presence of 2 TEPCO employees at the site is not confirmed on
 March 11th.
-On March 24th, it was confirmed that 3 workers from cooperative
 companies who were in charge of cable laying work in the 1st floor and
 the underground floor of turbine building were exposed to the radiation
 dose of more than 170 mSv. 2 of them were confirmed that their skins
 on legs were contaminated. After they were decontaminated, since there
 was a possibility of beta ray burn injury, they were transferred to
 Fukushima Medical University Hospital. The third worker was also
 transferred to Fukushima Medical University Hospital on March 25th.
 Later, the 3 workers were transferred to National Institute of
 Radiological Sciences in Chiba Prefecture. They all left the hospital
 on March 28th.
 Regarding this event, TEPCO has reported to the related government
 ministries and agencies on measures to be taken to assure appropriate
 radiation dose control and radiation exposure related operations.
 We will inform the related parties of countermeasures and continue to
 take all possible measures to future management.

Others 
-We measured radioactive materials (iodine etc.) inside of the nuclear
 power station area (outdoor) by monitoring car and confirmed that
 radioactive materials level is getting higher than ordinary level.
 As listed below, we have determined that specific incidents stipulated
 in article 15, clause 1 of Act on Special Measures Concerning Nuclear
 Emergency Preparedness (Abnormal increase in radiation dose measured
 at site boundary) have occurred.
 ·Determined at 4:17 pm Mar 12th (Around Monitoring Post 4 )
 ·Determined at 8:56 am Mar 13th (Around Monitoring Post 4 )
 ·Determined at 2:15 pm Mar 13th (Around Monitoring Post 4 )
 ·Determined at 3:50 am Mar 14th (Around Monitoring Post 6 )
 ·Determined at 4:15 am Mar 14th (Around Monitoring Post 2 ) 
 ·Determined at 9:27 am Mar 14th (Around Monitoring Post 3 ) 
 ·Determined at 9:37 pm Mar 14th (Around main entrance ) 
 ·Determined at 6:51 am Mar 15th (Around main entrance ) 
 ·Determined at 8:11 am Mar 15th (Around main entrance ) 
 ·Determined at 4:17 pm Mar 15th (Around main entrance ) 
 ·Determined at 11:05 pm Mar 15th (Around main entrance )
 ·Determined at 8:58 am Mar 19th (Around MP5)
 From now on, if the measured figure fluctuates and goes above and below
 500 micro Sv/h, we deem that as the continuous same event and will not
 regard that as a new specific incidents stipulated in article 15,
 clause 1 of the Act on Special Measures Concerning Nuclear Emergency
 Preparedness (Abnormal increase in radiation dose measured at site
 boundary) has occurred. In the interim, if we measure a manifestly
 abnormal figure and it is evident that the event is not the continuous
 same event, we will determine and notify. 

-The national government has instructed evacuation for those local
 residents within 20km radius of the periphery and evacuation to inside
 for those residents from 20km to 30km radius of the periphery, because
 it is possible that radioactive materials are discharged.
-At around 10:37 am March 21st, water spraying to common spent fuel pool
 and finished at 3:30 pm (conducted by TEPCO).
-At around 3:37 pm, March 24th, electricity supply to common spent fuel
 pool has started from external power source. At around 6:05 pm, fuel
 pool cooling pump was started to cool the pool.
-We found no signs of abnormal situation for the casks by visual
 observation during the patrol activity. A detailed inspection is under
 preparation.
-At Units 5 and 6, in order to prevent hydrogen gas from accumulating
 within the buildings, we have made three holes on the roof of
 the reactor building for each unit.
-In total 12 fire engines are lent for the water spraying to the spent
 fuel pools and water injection to the nuclear reactors by various
 regional fire departments* as well as Tokyo Fire Department. Also,
 instruction regarding the setting and operation of large scale
 decontamination system was provided by Niigata City Fire Headquarter
 and Hamamatsu City Fire Headquarter.
 *: Koriyama Fire Department, Iwaki Fire Brigade Headquarters, Fire
    Headquarters of Sukagawa District Wide Area Fire-fighting 
    Association, Yonezawa City Fire Headquarters, Utsunomiya City Fire
    Headquarters, Fire Headquarters of Aizu-Wakamatsu wide area
    municipal association, Saitama City Fire Bureau, and Niigata City
    Fire Bureau. 
-By March 22nd, Units 1 through 6 were started to be energized from
 the external power source.
-At 3:30PM, March 27th, we found that there was water in the trenches of
 Units 1 to 3. The radioactive emission at the surface of the water was
 0.4mSv/h for Unit 1 and over 1,000mSv/h for Unit 2. As for Unit 3,
 we couldn't have access to the surface because of debris. We will
 continue to monitor water in the trenches.
-At 12:03 pm, March 29th, when taking off the flange of the pipe 
 to remove the residual heat in the seawater system, 3 workers from 
 other companies received water in the pipe. Mopping up water, 
 we confirmed no radioactive material had adhered to their bodies. 
-We will continue to take all measures to ensure the safety and to
 continue monitoring the surrounding environment around the Power
 Station.