Friday, 3 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
The first case is confirmed (Fukushima Neclear Power Plant Timeline-2011 ) where radiation levels in humans have exceeded limits since the accident at the plant. One worker in his thirties received 678 mSv, while another one in his forties received 643 mSv. Before the accident the limit for emergency situations was 100 mSv, but it was raised by the government to 250 mSv just after the accident. The two TEPCO workers were on duty in the central control rooms of reactors 3 and 4 and tell the health and labor ministry that they don't remember whether they wore protective masks or not when a hydrogen explosion occurred at reactor 1 on March 12.
Saturday, 4 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
Air radiation readings of up to 4000 millisieverts per hour are recorded in the reactor 1 building.
Monday, 6 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
Japan's Nuclear and Industrial Safety Agency (NISA) gives new estimates of the times at which the reactor pressure vessels were damaged and possibly dropped fuel into the containment vessels: 5 hours after the initial earthquake for reactor 1 (20:00 March 11); 80 hours for reactor 2 (22:50 March 14); and 79 hours for reactor 3 (22:10 March 14).[213] In addition, NISA more than doubles its original estimate of radiation that escaped into the atmosphere in the first six days, from 370,000 terabecquerels to 770,000 terabecquerels.
Wednesday, 8 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
The ministry of education says that strontium 89
Sr and 90
Sr have been detected in soil samples collected from late March to early May and 22–62 km away from the Fukushima Daiichi Plant .The Japanese government's report on the Fukushima disaster to IAEA[216] is described in an article in the Yomiuri newspaper. The government report states that nuclear fuel has possibly melted through the base of the pressure vessels in the first three reactors. With data from the government report, the newspaper compares the March timelines provided by TEPCO and by NISA, which had performed further analysis; there were differences in the theoretical timing of events of up to 29 hours in the days following the tsunami.
Thursday, 9 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
A spokesman for TEPCO says the company is revising its earlier road-map for bringing the plant under control, including the time expected to achieve cold shutdown .
Tuesday, 14 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
From 00:44 to 02:35 there is a massive steam and smoke release from unit 3, recorded by the TEPCO live cam. No explanation has been given yet by TEPCO officials.
Wednesday, 15 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
TEPCO begins a trial run of a radioactive water treatment system in an effort to break away from the vicious cycle of injecting water into reactors to cool them and ending up with more contaminated water.[221] While contaminated water is treated, the system is expected to produce about 2,000 cubic meters of radioactive sludge by the end of 2011.
Saturday, 18 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
The radioactive water treatment system is forced to shut down because a filter exceeds its radioactivity limit. The separation unit, which removes caesium from the water, had been expected to last about a month before its cartridge required replacing; at a radiation level of 4 millisieverts per hour. The radiation levels near the filter cartridge replacement valves reach 4.7 millisieverts per hour after just 5 hours of operation, reportedly due to oil and sludge in the water which contained more radioactivity than expected
Sunday, 19 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
Radiation in some areas of Tsukidate, 50 km NW of the Fukushima 1 plant, exceeds the legal limit. The government plans to help households in designated areas to evacuate, raising concern among residents. Although the Tsukidate elementary school has not detected radiation levels in excess of the legal limit, about 80 parents and teachers thoroughly wash windows and verandas with high-pressure water jets and brushes and the school suspends activities on the playground in response to concern by parents.
Tuesday, 21 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
A radiation reading of 430 millisieverts per hour is recorded in a mezzanine between the first floor and basement of reactor 2. This is the highest level measured up to this point in the reactor 2 building, and marks the first time that workers have entered the basement of this building since the beginning of the crisis.
Monday, 27 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
Although the radioactive water treatment system has not yet started full-scale operation, a total of 1,850 tons of radioactive water has been processed during test runs of the system. Today this decontaminated water is used to cool the reactors for the first time. TEPCO states that it will continue injecting 16 tons of water per hour for cooling the 3 reactors, and that 13 tons of this will be made up from the decontaminated water.[226] The recycling system operates for only 90 minutes before it is halted due to a burst connection which leaks about one ton of water .
Wednesday, 29 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
TEPCO reports that tellurium-129m is found at 720 becquerels per liter of seawater collected on June 4, detected near the water intake for the reactor 1; about 2.4 times safe levels. Though tellurium-129m has a short half-life of about 34 days, TEPCO denied that its detection indicated the possibility of a new leak of radioactive water into the sea.
Thursday, 30 June-2011-Timeline of the Fukushima Diichi Neclear Disaster
The Itabashi Ward Office announces that a concentration of cesium-134 at 2,700 becquerels per kilogram — in excess of the government's provisional limit — was detected in tea processed from leaves picked on May 9 in Tokyo.
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