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Day 4 Fukushima 1 Nuclear Accidents
Day 4 Fukushima 1 Nuclear Accidents
6:08 AM
Posted by Energetic
Fukushima 1 Nuclear Accident Day 4: Monday, 14 March 2011
11:15- The outer building surrounding Unit 3 of Fukushima I explodes, presumably due to the ignition of built up hydrogen gas. No health risk reported, though 600 people have been ordered to stay indoors. Chief Cabinet Secretary Yukio Edano reported that "The vessel containing the No. 3 reactor’s radioactive core is intact after yesterday’s blast", and while that the outer reactor building of Unit 3 at Fukushima I was blown apart, the inner containment vessel was not breached. TEPCO also stated that one worker was injured and seven missing. TEPCO later said at least four employees and two contractors were injured in the blast.
- 11:44
- Radiation reading at the Fukushima I Nuclear Power Station (NPS) border is 20 μSv/hour.
- 12:30
Unit 1 | Unit 2 | Unit 3 | Unit 4 | Unit 5 | Unit 6 | |
---|---|---|---|---|---|---|
Power output (MWe) | 460 | 784 | 784 | 784 | 784 | 1100 |
Type of reactor | BWR-3 | BWR-4 | BWR-4 | BWR-4 | BWR-4 | BWR-5 |
Status at earthquake | In service | In service | In service | Defueled | Outage (scheduled) | Outage (scheduled) |
Fuel integrity | Damaged | Not damaged | Damaged | Not damaged | Not damaged | Not damaged |
Containment integrity | Not damaged | Not damaged | Not damaged | Not damaged | Not damaged | Not damaged |
Core cooling system 1 (ECCS/RHR) | Not functional | Not functional | Not functional | Not necessary | Not necessary | Not necessary |
Core cooling system 2 (RCIC/MUWC) | Not functional | RCIC working | Not functional | Not necessary | Not necessary | Not necessary |
Building integrity | Damaged | Not damaged | Damaged | Not damaged | Not damaged | Not damaged |
Pressure vessel, water level | Unknown | Above core | Unknown | Safe | Safe | Safe |
Pressure vessel, pressure | Stable | Stable | Stable | Safe | Safe | Safe |
Containment pressure | Stable | Stable | Stable | Safe | Safe | Safe |
Seawater injection | Suspended | To be decided | Performed | Not necessary | Not necessary | Not necessary |
Containment venting | Performed | Preparing | Performed | Not necessary | Not necessary | Not necessary |
Environmental effect (NPS border) | 20 μSv/hour at 11:44 | |||||
Evacuation radius | 20 km | |||||
INES | Level 4 (estimated by NISA) |
- 13:15
- Fukushima II Unit 1 cooling system has been restored, work continues on units 2 and 4.
- 13:55
- Radiation reading at the Fukushima I Nuclear Power Station (NPS) border is 15 μSv/hour.
- 20:30
Unit 1 | Unit 2 | Unit 3 | Unit 4 | Unit 5 | Unit 6 | |
---|---|---|---|---|---|---|
Power output (MWe) | 460 | 784 | 784 | 784 | 784 | 1100 |
Type of reactor | BWR-3 | BWR-4 | BWR-4 | BWR-4 | BWR-4 | BWR-5 |
Status at earthquake | In service | In service | In service | Defueled | Outage (scheduled) | Outage (scheduled) |
Fuel integrity | Damaged | Unknown | Damaged | Not damaged | Not damaged | Not damaged |
Containment integrity | Not damaged | Not damaged | Not damaged | Not damaged | Not damaged | Not damaged |
Core cooling system 1 (ECCS/RHR) | Not functional | Not functional | Not functional | Not necessary | Not necessary | Not necessary |
Core cooling system 2 (RCIC/MUWC) | Not functional | Not functional | Not functional | Not necessary | Not necessary | Not necessary |
Building integrity | Damaged | Not damaged | Damaged | Not damaged | Not damaged | Not damaged |
Pressure vessel, water level | Unknown | Low (recovering) | Unknown | Safe | Safe | Safe |
Pressure vessel, pressure | Low | Unknown | Stable | Safe | Safe | Safe |
Containment pressure | Stable | Increasing | Stable | Safe | Safe | Safe |
Seawater injection | Suspended | Performed | Performed | Not necessary | Not necessary | Not necessary |
Containment venting | Performed | Preparing | Performed | Not necessary | Not necessary | Not necessary |
Environmental effect (NPS border) | 15 μSv/hour at 13:55 | |||||
Evacuation radius | 20 km | |||||
INES | Level 4 (estimated by NISA) |
- 21:00 (approximate)
- Fuel rods within Reactor #2 of the Fukushima I nuclear plant were fully exposed to air (but were still within the intact containment vessel and therefore not exposed to the outer atmosphere). TEPCO earlier said the cooling system had been lost and began injecting seawater into the reactor to cool it down.
- 21:08
- The IAEA announce the temperature in the spent fuel pond of reactor 4 are at 84 °C
- 21:16
- Yukio Edano affirms that Reactor number 2 of Fukushima I is unlikely to explode. In addition, he stated that there is ongoing work to cool down the reactor.
- 23:20 (approximate)
- Fuel rods at Reactor #2 of Fukushima I became fully exposed once again. TEPCO says that pressure inside the reactor rose again because the unit's air flow gauge was accidentally turned off. With the gauge turned off, flow of water into the reactor was blocked, leading to full exposure of the rods.
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This entry was posted on October 4, 2009 at 12:14 pm, and is filed under
Fukushima 1 Nuclear Accidents Timeline
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