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22 mars 2011 2 22 /03 /mars /2011 22:26

 

Press Release (Mar 22,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 11:00 PM Mar 22nd)
 
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 11:00 PM Mar 22nd)

*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 3:36PM Mar 12th. It was
assumed to be hydrogen explosion.
-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 6:00AM on March 15th, 2011, an abnormal noise began
emanating from nearby Pressure Suppression Chamber and the pressure
within this chamber decreased.
-We completed receiving electricity from the external transmission line
up to the auxiliary transformer. We installed the power cable from the
transformer to the temporary power panel. At 3: 46 PM, March 20th, we
started energizing the load-side power panel.
-At 6:20 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 6:15AM 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.
-We are working on receiving external power supply to Units 3 and 4.
-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.
-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 6AM 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 discharge by Self-Defense Force's helicopters was
conducted from 9:48 AM in the morning on March 17th. Also water
discharge by the riot police's high-pressure water cannon trucks and
Self-Defense Force's fire engines was conducted from 7PM on March 17th
and finished at 8:09PM.
-In Unit 3, water discharge by Self-Defense Force's fire engines and US
army's fire engines was conducted from 2 PM and completed a quarter to
3 PM.
-After that, from 0:30 AM, Mar 19th, water discharge by Tokyo Fire
Department's Hyper Rescue was conducted to Unit 3 and completed at
1:10 AM. At around 2:10PM, water discharge by Tokyo Fire Department's
Hyper Rescue to Unit 3 was conducted once again. At approximately 3:40
am, they had finished water discharge.
-At approximately 8:21 am, March 20th, water discharge 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 discharge 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 discharge 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 discharge 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 discharge into Unit 3 by Tokyo
Fire Department's Hyper Rescue 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 discharge into Unit 4 from the
concrete pumping vehicle was conducted and ended at around 8:30 PM on
the same day.
-We are considering further water discharge 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 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.

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 discharge 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 Unit 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.
-We will continue to take all measures to ensure the safety and to
continue monitoring the surrounding environment around the Power
Station.

 

Source : TEPCO

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