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Early in 2015 Japan ratified the Convention on Supplementary Compensation for Nuclear Damage (CSC). The document includes analysis of a magnitude 8.3 earthquake that is known to have struck the region more than 1140 years ago, triggering enormous tsunamis that flooded vast areas of Miyagi and Fukushima prefectures. In May 2015 its final report was delivered to member states, and was published in September. (Japan Times 17/11/13) Another reported contrast from the Reconstruction Agency is that some $30 billion had been paid to 84,000 nuclear accident refugees but only some $20 billion to 300,000 tsunami survivors in the Tohoku region.In mid-May 2011 work started towards constructing a cover over unit 1 to reduce airborne radioactive releases from the site, to keep out the rain, and to enable measurement of radioactive releases within the structure through its ventilation system. The highest radiation levels on site came from debris left on the ground after the explosions at units 3&4.A radiation survey map of the site made in March 2013 revealed substantial progress: the highest dose rate anywhere on the site was 0.15 mSv/h near units 3 and 4.

They should "avoid over-conservatism" which "could not effectively contribute to the reduction of exposure doses" to people. Of these 135 had received 100 to 150 mSv, 23 150-200 mSv, three more 200-250 mSv, and six had received over 250 mSv (309 to 678 mSv) apparently due to inhaling iodine-131 fume early on. This would generally involve removing the fuel and then sealing them for a further decade or two while the activation products in the steel of the reactor pressure vessels decay. Remediation over the next couple of years proceeded approximately as planned. Tepco accepted the conditions imposed on the company as part of the package. Fuel debris retrieval from within the reactor is scheduled from about 2021, after that from units 1&2 is started.Spent fuel removal from units 1&2 pools is scheduled in 2018, and fuel debris retrieval from within the reactors from 2020.In September 2013 Tepco commenced work to remove the fuel from unit 6. Tepco management ignored an instruction from the prime minister to cease the seawater injection into unit 1, and this instruction was withdrawn shortly afterwards.New cooling circuits with heat exchangers adjacent to the reactor buildings for all four ponds were commissioned after a few months, and each reduced the pool temperature from 70°C to normal in a few days. In two places the doses were higher – between 10 and 50 mSv, still below any harmful level. Eventually these will be shipped to JNFL’s Rokkasho reprocessing plant or to Recyclable Fuel Storage Company’s new Mutsu facility. The dry storage area held 408 fuel assemblies at the time of the accident, and 1004 have been transferred there since (to mid-2014).UNSCEAR’s final report of radiation effects was released in April 2014. A crane and other equipment for fuel removal would then be installed in a new cover over the building, similar to that over unit 4.At the time of the accident, in addition to a large number of used fuel assemblies, unit 4's pond also held a full core load of 548 fuel assemblies while the reactor was undergoing maintenance, these having been removed at the end of November, and were to be repplaced in the core.A different design of cover is being built over unit 3, and foundation work had begun in 2012. Large rubble removal took place from 2013 to 2015, including the damaged fuel handling machine. 60 Minutes' reporting from Fukushima. Unit 3 was undamaged and continued to 'cold shutdown' status on 12th, but the other units suffered flooding to pump rooms where the equipment transfers heat from the reactor heat removal circuit to the sea.