*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 nuclear
reactor through the feed water system was initiated.
- From 3:37 pm on March 25, we started injecting freshwater and are now
injecting fresh water by a motor driven pump powered by the off-site
transmission line. From on April 27, we have increased the amount of
injecting freshwater from approximately 6 m3/h to approximately 14 m3/h.
At 10:14 am on April 29, we put the amount of injecting freshwater back
to approximately 6 m3/h.
- As it is suspected that hydrogen gas is accumulated inside reactor
containment vessel, we commenced the valve opening operation concerning
injection of nitrogen gas into the reactor container vessel at 10:30 pm
April 6th and commenced injection at 1:31am April 7.
- At 10:01 am on May 6th, in order to make nuclear reactor flooded to the
top of Fuel range, we have increased the amount of injecting freshwater
from approximately 6 m3/h to approximately 8m3/h.
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.
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.
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 the
Nuclear Reactor Building.
- At this moment, we do not consider any reactor coolant leakage inside
the reactor happened.
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 reactor cold shutdown.
- 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.
- 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 reactor cold shutdown.
- At this moment, we do not consider any reactor coolant leakage inside
the reactor happened.
Operation for cooling the spent fuel pools
- From 9:36 am to 11:16 am on May 6th, we conducted water spray for unit 2,
using temporary electric pump.
- From 12:38 pm on May 6th, we started water spay to Unit 4 by the
concrete pumping vehicle.
- We will continuously conduct further water spray depending on the
conditions of spent fuel pools, if needed.
Others
- Regarding the transfer of high level radioactive wastewater in Unit 2 to
the Centralized Radiation Waste Treatment Facility, while we temporarily
suspended transfer due to the inspection of transferring facilities at
9:16 am on April 29, transfer was restarted at 2:05pm on April 30.
- The transfer of accumulated water in Unit 6 turbine building to a
temporary tank was conducted from 2:00 pm to 5:00 pm on May 3.
- From March 27, transfer of accumulated water in Unit 5 turbine building
to a condenser has been conducted, and water with the amount of
approximately 600m3 has been transferred from March 27 to May 2.
- From May 2, we have started work relating to the set up of exhausters,
in order to improve the working environment inside the reactor building
of Unit 1. At 4:36 pm on May 5th, all of exhausters(6 units) were
started to operation.
- The transfer of accumulated water in Unit 6 turbine building to a
temporary tank was started at 2:00 pm on May 6th.
- We will continue to take all measures to ensure the safety and to
continue monitoring the surrounding environment around the power station.