Fukushima crisis and Japanese Governemnt’s Reaction Timeline
Nuclear Crisis
Japan Government Action
11/3
Fukushima Daiichi nuclear plant was hit and damaged by a fierce tsunami of magnitude-9 (Richter magnitude scale) earthquake.
12/3
Explosion at Reactor 1 caused by venting hydrogen from the reactors leaks radiation.
The authority set up an evacuation zone of 20km around the site.
13/3
The authority claimed the nuclear crisis Level 4 (Accident with local consequences) in the International Nuclear and Radiological Event Scale (INES).
14/3
Explosion took place in Reactor 3, destroying the building.
15/3
Hydrogen explosion in Reactor 2 and 4.
The authority set up 20-30km voluntary evacuation zone, suggesting residents staying indoors.
16/3
Fire was set off in Reactor 4. Smoke came up from Reactor 3. Namiemachi (浪江町), a town located at 21km from the plant, was detected with 0.33 mSv/ hour radiation, equivalent to 6600 times of the normal level.
18/3
High radiation levels had been detected in an area 30 kilometers (18.6 miles) northwest of the damaged Fukushima I nuclear plant. The reading was 150 microsieverts per hour.
The government classified the crisis to INES Level 5 (Accident with wider consequences).
19/3
The authority prohibited the sale of produce from Fukushima and Ibaraki Prefecture.
24/3
Seawater injection to Reactor 1, 2 and 3 continued.
25/3
Nuclear and Industrial Safety Agency announced a possible breach in the containment vessel of reactor3.
27/3
10 million times the normal level of radioactive material water found in Reactor 2 was later retracted and attributed to incorrectly high levels of iodine-134.
28/3
The amount of water pumped into Reactor 2 was reduced from 16 tons per hour to 7 ton /hour, which could lead to higher reactor temperatures.
29/3
Water was kept spraying into Reactors 1–3. It is discovered that radioactive runoff water was about to fill utility trenches outside the three reactor buildings.
31/3
Workers pumped radioactive water from a utility trench near reactor No. 1 into a storage tank near reactor No. 4.
2/4
Reactor 2 leaked sewage with high radioactive substances –iodine-131 (30 Bq /ml, which is 7.5M times of the standard).
3/4
Mixture of a water-absorbing polymer, sawdust and shredded paper was injected to Reactor2.
4/4
Water with low levels of radioactivity began to be dumped into the Pacific Ocean on Monday night to spare space to store more dangerously radioactive water in central waste facility.
6/4
An injection of 6,000 litres of polymer coagulant into the pit mitigated the leaking.Sodium Silicate and additives were injected into the ground in order to stop the leakage of radioactive water.
Despite discontent from the South Korean government, Russian scientists, and Japanese fishermen, Japan authorized the release of the 11,500 tonnes of low radioactive water into the ocean to spare space to store more contaminated water.
7/4
A rise in temperature at Reactor 1 consecutive to the aftershock.
12/4
The authority raised the severity rating of the crisis to INES Level 7, the highest level. (Major accident).
18/4
Two Packbot ground robots have entered Reactor 1 & 3 of Fukushima nuclear power plant and measured temperature, pressure, and radioactivity.
19/4
Radioactive cooling water from the Reactor 2′s basement and maintenance tunnels was transferred to a waste processing facility.
20/4
22/4
The government plans to build 30,000 temporary homes by the end of May, following by another 70,000.
This entry was posted on Friday, April 22nd, 2011 at 3:13 pm and is filed under Timeline. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
One Comment to “Fukushima crisis and Japanese Governemnt’s Reaction Timeline”
Enjoyed studying this, very good stuff, thanks .