All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.
[There is no update from the previous press release.]
Unit 1(Shut down)
- Reactor has been shut down. However, the unit is under inspection due
to the explosive sound and white smoke that was confirmed after the big
quake occurred at 3:36PM.
- We have been injecting sea water and boric acid which absorbs neutron
into the reactor pressure vessel.
Unit 2(Shut down)
- Reactor has been shut down and Reactor Core Isolation Cooling System
has been injecting water to the reactor. Current reactor water level is
lower than normal level, but the water level is steady. After fully
securing safety, measures to lowering the pressure of reactor
containment vessel has been taken, under the instruction of
the national government.
Unit 3(Shut down)
- Reactor has been shut down. However, as High Pressure Core Injection
System has been automatically shut down and water injection to
the reactor was interrupted, following the instruction by
the government and with fully securing safety, steps to lowering
the pressure of reactor containment vessel has been taken. Spraying
in order to lower pressure level within the reactor containment vessel
has been cancelled.
- After that, safety relief valve has been opened manually, lowering
the pressure level of the reactor, which was immediately followed
by injection of boric acid water which absorbs neutron, into
the reactor pressure vessel.
Unit 4 (shut down due to regular inspection)
- Reactor has been shut down and sufficient level of reactor coolant
to ensure safety is maintained.
- Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.
Unit 5 (outage due to regular inspection)
- Reactor has been shut down and sufficient level of reactor coolant
to ensure safety is maintained.
- Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.
Unit 6 (outage due to regular inspection)
- Reactor has been shut down and sufficient level of reactor coolant
to ensure safety is maintained.
- Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.
Casualty
- 2 workers of cooperative firm were injured at the occurrence of
the earthquake, and were transported to the hospital.
- 1 TEPCO employee who was not able to stand by his own with his hand
holding left chest was transported to the hospital by an ambulance.
- 1 subcontract worker at important earthquake-proof building was
unconscious and transported to the hospital by an ambulance.
- The radiation exposure of 1 TEPCO employee, who was working inside
the reactor building, exceeded 100mSv and was transported to
the hospital.
- 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 Power Station for consultation with
a medical advisor.
- 4 workers were injured and transported to the hospital after explosive
sound and white smoke were confirmed around the Unit 1.
- Presence of 2 TEPCO employees at the site are not confirmed
Others
- We are currently coordinating with the relevant authorities and
departments as to how to secure the cooling water to cool down
the water in the spent nuclear fuel pool.
- We measured radioactive materials inside of the nuclear power station
area (outdoor) by monitoring car and confirmed that radioactive
materials level is higher than ordinary level. Also, the level
at monitoring post is higher than ordinary level. We will continue
to monitor in detail the possibility of radioactive material being
discharged from exhaust stack or discharge canal. The national
government has instructed evacuation for those local residents within
20km radius of the periphery because it's possible that radioactive
materials are discharged.
- We will continue to take all measures to restore the security of the
site and to monitor the environment of the site periphery.
