Results 1 - 10 of 155
Results 1 - 10 of 155. Search took: 0.024 seconds
|Sort by: date | relevance|
[en] Together with decontamination works performed in 51 towns and covering a 8953 km2 area, efforts in reconstruction, agriculture and industry have been made to reintegrate the Fukushima region to Japan in a social and economic way. Several research centers have opened to create the 'coast of innovation', a hub to boost new technologies in Japanese industry. The important decrease of the radioactivity is due to the radioactive decay of Cs134 (T=2.1 y) and Cs137 (T=30.1 y). Today Fukushima region has radioactivity rates equivalent to any urban areas: 0.12 μSv/h and for instance 0.10 μSv/h in London. This decrease has allowed the progressive reduction of the exclusion zone and the resumption of agricultural activities. Except wild berries, game and wild mushrooms, local products are no more a cause of concern. Despite efforts for greater transparency and public information, there is still a widespread suspicion in the public 9 years after the catastrophe. (A.C.)
[en] The Fukushima accident once again raises the question of the social and economic viability of nuclear technology. On an international basis, maximum safety must be guaranteed to avoid any further accident in order to preserve the acceptability of the technology. To obtain a significant reorientation in standards for the design, operation and institutional practices for control and safety in all countries with nuclear facilities, the ideal would be to succeed in setting up international governance that is binding. This article examines the incentives and conditions to achieve it. (author)
[en] 6 years after the nuclear accident, 100 m3 of water are injected per day in each reactor to cool them. Water is recovered, decontaminated and re-injected. Contaminated water is also recovered as it piles up against an ice wall preventing it to flow to the ocean. Groundwater is also pumped upstream of the Fukushima plant in order to prevent it to flow below the plant. Despite the use of muon radiography, corium position is unknown so far. Very high radioactivity (530 Sievert/h) was detected in january 2017 below the reactor 2. The last official estimation of the cost of the accident is 167 billions euros. (A.C.)
[en] 4 years after the Fukushima accident a part of the evacuated population will be allowed to go home in the areas where radioactive contamination has fallen below 20 mSv/year. About one third of the evacuated zone will remain inhabited on a long term perspective because of a radioactive contamination above 50 mSv/year. The Futaba and Okuma towns (7.500 and 11.000 inhabitants respectively before the accident) have been chosen to home radioactive waste and contaminated soils, they will never again be inhabited. A study has shown that only 0.6% of the food produced in the Fukushima region in 2014 contained an excess of radioactivity. The risk for the japanese population to be contaminated through food is then very low. (A.C.)
[en] On 11 March 2011 a massive earthquake and tsunami caused a major accident at the Fukushima Daiichi nuclear power plant in Japan, the world’s worst nuclear accident since Chernobyl in 1986. Fuel removal and postaccident stabilization and cleanup activities are ongoing at the plant, with the aim that active dismantling can proceed in due course. In the five years since the accident, at the request of the Government of Japan, the IAEA sent more than ten expert missions to advise the country in various areas, including three on the safety and technological aspects of decommissioning and remediation. The objective of the decommissioning peer review missions was to provide an independent assessment of the activities associated with the planning and implementation of decommissioning the plant.
[en] The Fukushima Daiichi nuclear accident had devastating consequences for the Japanese population and it has raised strong concerns about the effectiveness of the international governance of Nuclear Safety. The actual safety regime is mainly based on the international conventions adopted as a followup of the Chernobyl disaster. It is also composed by soft law instruments such as the Safety Standards published by the IAEA. This paper establishes a first overview of the works initiated at international level in order to improve the nuclear safety legislation, including the start of the amendment process of the Convention on Nuclear Safety. This process will discuss through a diplomatic conference, to be organized in 2015, the possibility to extend the objectives of nuclear safety to cover not only the protection of the population but also its living environment. In addition, the European Union, which is the first regional actor with legally binding regulations in the safety field, has launched a revision process of its directive on nuclear safety straight after the Fukushima Daiichi nuclear accident. The article eventually exposes the main provisions of the revised European directive on nuclear safety published in July 2014. (author)
[en] This article takes up pieces of information given by J. Repussard (Director general of the French Institute for Radioprotection and Nuclear Safety - IRSN) in an interview to the 'Les Echos' business newspaper. A point is made on the situation at Fukushima: an ice wall surrounding the 4 damaged reactors was completed in November 2017, it allows the plant to be isolated from ground waters. There has been also a very important work to remove the contaminated upper part of the ground and the Japanese authorities have acquired land to store millions of earth big bags. Unexpectedly the radiation dose received by workers in the evacuated area is less by one third than expected. According to J. Repussard the nuclear risk could be dealt with by building smaller reactors. In such reactors the corium can be contained inside the reactor pressure vessel which reduces the consequence of an accident. The EPR (European Pressurized Reactor) is a very good reactor concerning safety and production but EDF has totally underestimated the time frame for its implementation. (A.C.)
[en] The control of safety problems requires at first a good knowledge and the control of risks; this control is among other things based on the detailed exploitation of the first hand experiences and more generally on the history and the analysis of all the serious accidents occurred in the industrial sector. Moreover, the control of risks influence the regulations which evolve with the knowledge. (O.M.)
[en] This publication describes the generally applicable requirements to be fulfilled in safety assessments for facilities and activities, with special attention paid to defence in depth, quantitative analyses and the application of a graded approach to the range of facilities and activities that are addressed. The requirements provide a consistent and coherent basis for safety assessments, facilitating the transfer of good practices between organizations. A review of Safety Requirements publications was commenced in 2011 following the accident in the Fukushima Daiichi nuclear power plant in Japan. The review revealed no significant areas of weakness and resulted in just a small set of amendments to strengthen the requirements and facilitate their implementation, which are contained in the present publication.