*new items are underlined
All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.
Unit 1 (Shut down)
- Reactor has been shut down. However, the 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 was started to be
injected to the nuclear reactor through the feed water system.
- We have been injecting sea water into the reactor pressure vessel.
Unit 2 (Shut down)
- Reactor has been shut down and the level of reactor coolant had dropped
and the reactor pressure had increased because the Reactor Core Isolation
Cooling System stopped. Measures were taken to lower the pressure within
the Reactor Containment Vessel and to inject sea water into the Reactor
while carefully confirming safety. The level of reactor coolant and the
pressure of the Reactor resumed.
- At approximately 6:00 am on March 15th, an abnormal noise began emanating
from nearby Pressure Suppression Chamber and the pressure within this
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 where we can hardly confirm
- We have been injecting sea water into the reactor pressure vessel.
Unit 3 (Shut down)
- Reactor has been shut down. However, the explosive sound and white smoke
were confirmed at 11:01am Mar 14th. 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 a
measurement 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 take a measure immediately to discharge air containing radioactive
material to outside now. 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.
- We have been injecting sea water into the reactor pressure vessel.
Unit 4 (outage due to regular inspection)
- Reactor has been shut down. However, at approximately 6 am on March 15th.
We have 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 containment vessel happened.
Unit 5 (outage due to regular inspection)
- Reactor has been shut down and the 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 this moment, we do not consider any reactor coolant leakage inside
the reactor containment vessel happened.
- At 2:30 pm, March 20th, the reactor achieved reactor cold shutdown.
Unit 6 (outage due to regular inspection)
- Reactor has been shut down and the sufficient level of reactor coolant
to ensure safety is maintained.
- We are working on receiving external power supply to Units 5 and 6. 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 this moment, we do not consider any reactor coolant leakage inside
the reactor containment vessel happened.
- At 7:27 pm, March 20th, the reactor achieved reactor cold shutdown.
Cooling of spent fuel pools
- In Unit 3, water spraying by Self-Defense Force's helicopters was
conducted from 9:48 am in the morning on March 17th. Also water spraying
by the riot police's high-pressure water cannon trucks and Self-Defense
Force's fire engines was conducted from 7 pm on March 17th and finished
at 8:09 pm.
- In Unit 3, water spraying by Self-Defense Force's fire engines and US
army's fire engines was conducted from 2 pm and completed 3:45 pm.
- After that, from 0:30 am, Mar 19th, water spraying by Tokyo Fire
Department's Hyper Rescue was conducted to Unit 3 and completed at 1:10
am. At around 2:10 pm, water spraying by Tokyo Fire Department's Hyper
Rescue to Unit 3 was conducted once again. At approximately 3:40 am,
they had finished water spraying.
- At approximately 8:21 am, March 20th, water spraying to Unit 4 by fire
engine has started with the cooperation of Self-Defense Forces and
finished at approximately 9:40 am. At approximately 6:45 pm, March 20th
water spraying to Unit 4 by Self-Defense's water cannon trucks was
conducted and finished at approximately 7:45 pm.
- From 3:05 pm to 5:20 PM on March 20th, 40 tons of seawater was injected
into Unit 2 by TEPCO employees.
- From 9:30 pm on March 20th, water spraying by Tokyo Fire Department's
Hyper Rescue was conducted to Unit 3 and completed at approximately 4:00
am today.
- At approximately 6:30 am today,, water spraying to Unit 4 was started by
Self-Defense Force's fire engines and US army's fire engines and was
finished at approximately 8:40 am.
- From around 4:00 pm to 5:00 pm on March 22nd, approximately 18 tons of
seawater was injected into Unit 2 by TEPCO employees.
- From around 3:10 pm on March 22nd, water was sprayed to Unit 3 by Tokyo
Fire Department's Fire Rescue Task Forces and Osaka City Fire Department
was conducted and completed at approximately 4:00 pm on the same day.
From around 5:20 pm on March 22nd, water was sprayed to Unit 4 using the
concrete pumping vehicle and it was finished at around 8:30 pm on the
same day.
- At approximately 10:00 am on March 23rd, we started spraying water to
Unit 4 using the concrete pumping vehicle and completed at around 1:00
pm. And at around 11:00 am, sea water injection to fuel spent pool of
unit 3 was started by using Fuel Pool Cooling and Filtering(clean up)
system (FPC) and finished at around 1:20 pm.
- We are considering further spraying at other units and others subject
to the conditions of spent fuel pools.
Casualty
- 2 workers of cooperative firm were injured at the occurrence of the
earthquake, and were transported to the hospital on March 11th.
- 4 workers were injured and transported to the hospital after explosive
sound and white smoke were confirmed around the Unit 1on March 11th.
- Presence of 2 TEPCO employees at the site is not confirmed on March 11th.
- 1 TEPCO employee who was not able to stand by his own holding left chest
with his hand, was transported to the hospital by an ambulance on March
12th.
- 1 subcontract worker at the key earthquake-proof building was unconscious
and transported to the hospital by an ambulance on March 12th.
- The radiation exposure of 1 TEPCO employee, who was working inside the
reactor building, exceeded 100mSv and he was transported to the hospital
on March 12th.
- 2 TEPCO employees felt bad during their operation in the central control
rooms of Unit 1 and 2 while wearing full masks, and were transferred to
Fukushima Daini Nuclear Power Station for consultation with a medical
advisor on March 13th.
- 11 workers were injured and transported to Fukushima Daini Nuclear Power
Station etc. after explosive sound and white smoke were confirmed around
the Unit 3. One of the workers was transported to the FUKUSHIMA Medical
University Hospital on March 14th.
- At approximately 10 pm on March 22nd, 1 worker who had been working on
setting up a temporary power panel in the common pool was injured and
transported to Fukushima Daini Nuclear Power Station where the industrial
doctor is.
- At approximately 1 am on March 23rd, 1 worker who had been working on
transporting a temporary power panel in the common pool was injured and
transported to Fukushima Daini Nuclear Power Station where the industrial
doctor is.
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's possible that radioactive materials are discharged.
- At approximately 10am on March 15th, we observed 400mSv/h at the inland
side of the Unit 3 reactor building and 100mSv/h at the inland side of
the Unit 4 reactor building.
- We checked the status of spent fuel in the common pool, and confirmed
that the water level secured. We are planning to conduct a detailed
inspection.
- 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.
*: 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.
- On March 21st and 22nd, we detected cobalt, iodine and cesium from the
seawater around discharge canal of Units 1, 2, 3 and 4.
- We detected iodine and cesium in the air collected at the site of
Fukushima Daiichi Nuclear Power Station on March 20th and 21st.
- Until March 22nd, Units 1 through 6 were started to be energized from
the external power source.
- We will continue to take all measures to ensure the safety and to
continue monitoring the surrounding environment around the Power Station.
