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Press Release (Mar 21,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 9:00 AM Mar 21st)
 
*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 15, 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.
-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.
-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 19, 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 20, 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.  
-We are considering further water discharge at Unit 3 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. 
-We will continue to take all measures to ensure the safety and to
 continue monitoring the surrounding environment around the Power Station. 
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