Currently there is much high level radioactive waste water in the
turbine buildings of Fukushima Daiichi Nuclear Power Station. On
April 10th, from the Minister of Economy, Trade and Industry, we
received an order of submission of a report regarding necessity and
safety assessment on transfer of high level radioactive water in
Fukushima Daiichi Nuclear Power Station to the Centralized Radiation
Waste Treatment Facility, and a principle for a permanent storage
method and treatment facilities.
(previously announced on April 15th, 2011)
On April 18th, a leakage block measure, etc. for the Process Main
Building in the Centralized Radiation Waste Treatment Facility was
completed. Based on the above order, we compiled the results and
reported to the Minister of Economy, Trade and Industry. The contents
of the report were confirmed by the Nuclear and Industrial Safety
Agency.
(previously announced on April 19th, 2011)
Since April 19th, we have continuously conducted a transfer of high
level radioactive water from the turbine building of Unit 2 to the
Process Main Building of the Centralized Radiation Waste Treatment
Facility.
After that, because the water level of the radioactive waste water in
the turbine building of Unit 3 has increased, we have conducted a
leakage block work for the Miscellaneous Solid Waste Volume Reduction
Treatment Building of the Centralized Radiation Waste Treatment
Facility to secure a temporary storage space.
On May 16th, because we completed the leakage block work, etc. we
compiled the results based on the above order and reported to the
Minister of Economy, Trade and Industry. The contents of the report
were confirmed by the Nuclear and Industrial Safety Agency. Thus we
started to transfer the high level radioactive waste water from the
turbine building of Unit 3 to the Centralized Radiation Waste
Treatment Facility.
(previously announced on May 16th, 2011)
After that, we had transferred the radio active waste water to the
Process Main Building and the Miscellaneous Solid Waste Volume
Reduction Treatment Building. However, because the water storage in
the Process Main Building was almost full and we found there was a
possibility to leak to the nearby underground passage in the
Miscellaneous Solid Waste Volume Reduction Treatment Building, we
interrupted the transfer work.
Under these circumstances, the water level in the turbine buildings
of Unit 2 and Unit 3 has increased. In order to prevent a leakage to
the outside system, we reviewed the water storage level of the
Process Main Building and reported to the Nuclear and Industrial
Safety Agency.
(previously announced on June 4th, 2011)
We started a transfer of water in the turbine building of Unit 2 to
the main process building since 6:39 pm on June 4th, and a transfer
of water in the turbine building of Unit 3 to the surface condenser
of Unit 3 since 6:26 pm on June 5th.
This time, in order to reduce risks of leakage of water in the
turbine buildings of Unit 2 and Unit 3 to the outside system, we
reviewed the water storage level of the Process Main Building and
reported to the Nuclear and Industrial Safety Agency.
(previously announced on June 8th, 2011)
We stopped the transfer of water in the turbine building of Unit 2
to the Process Main Building at 8:40 am on June 16th.
We also stopped the transfer of water in the turbine building of
Unit 3 to the surface condenser of Unit 3 as the water volume
reached its planned capacity at 10:44 am on June 9th. After that,
we started a transfer of the water to the Process Main Building at
10:05 am on June 14th and stopped the transfer at 8:46 am on June
16th.
This time, in order to reduce risks of leakage of water in theturbine
buildings of Unit 2 and Unit 3 to the outside system, we conducted an
evaluation for risks of water leakage from nearby underground passage
which had a possibility to leak to underground water, caused by re-
start of water transfer to the Miscellaneous Solid Waste Volume
Reduction Treatment (High Temperature Incinerator Building). (The
water transfer to the Miscellaneous Solid Waste Volume Reduction
Treatment has been interrupted since May 25th.) We compiled the
results and reported to the Nuclear and Industrial Safety Agency.
(previously announced on June 17th, 2011)
As for the leakage of water in the turbine building of Unit 2, we
started the transfer of water to the surface condenser of Unit 1 at
1:37 pm on June 20th, and stopped the transfer at 5:09 pm on June
21st as the water volume reached its planned capacity. We also
restarted the transfer of water to the Process Main Building at 9:56
am on June 22nd.
As for the leakage of water in the turbine building of Unit 3, we
started the transfer of water to the Miscellaneous Solid Waste Volume
Reduction Treatment at 1:31 pm on June 18th, and stopped the transfer
at 0:02 am on June 20th as the water volume reached its planned
capacity. We also restarted the transfer of water to the Process Main
Building at 3:32 pm on June 21st.
This time, in order to reduce risks of leakage of water in the
turbine buildings of Unit 2 and Unit 3 to the outside system, we
reviewed the water storage level of the Process Main Building and
reported to the Nuclear and Industrial Safety Agency.
Attachment1: Further change in the storage level of waste water
transferred to the Process Main Building (summary) (PDF 60.0KB)