[en] Following the Fukushima 1 accident, Areva and its partners VEOLIA Waters and CEA have been involved in the immediate response to the crisis by designing and implementing a water treatment solution in a very short time. Out of the boundaries of the power plant, atmospheric releases have occurred, leading to surface contamination of grounds, buildings and water retentions. Cleanup of the evacuated areas is mandatory to enable local population to come back and farming activities to resume. Areva and CEA are proposing biological and physical-chemical solutions, forming a comprehensive strategy to decontaminate lands. It is based on the expertise gained from dismantling of French nuclear sites, the lessons learned from cleanup of the Chernobyl region and the comprehensive R and D programs carried out by CEA. It provides a complete industrial and eco-friendly solution, in which the volume of radioactive waste is minimized and conditioned in a stable way. This paper focuses on physico-chemical technologies which could be applied at short or mid terms. Biological technologies including phyto-remediation are still under development and should complete the previous solutions for large scale agricultural areas. The strategy is composed of complementary steps for which facilities and tools are being developed together with Japanese partners. First, areas must be monitored for contamination. Measurement systems mounted on unmanned helicopter enables very quickly segregating houses and trees to be decontaminated. It is expected to be more than ten times faster than monitoring by operators. Another monitoring device is the road monitoring vehicle, to efficiently select road sections to be decontaminated or a under water operated remote operated vehicle (ROV) for monitoring inside lakes and ponds. After evaluation of the areas and built up of a decontamination strategy, soils have to be treated, within an evaluated depth of 5 to 10 cm. Contaminated areas are wide and millions of tons of soils will have to be processed. Fortunately, as it has been proved by several studies, contamination concentrates into localized spots. For such areas, a mobile soil sorting unit has been developed. Once the contaminated soils or the tsunami radioactive waste have been put apart, they have to be efficiently treated in order to concentrate radioactivity in the smallest volume possible while preserving the ground fertility and consuming as less as possible of natural resources like water. Such treatment may either be based on innovative foam flotation or supercritical CO₂ extraction techniques depending on the nature of the solid to be treated, To decontaminate water retentions or effluents generated from former decontamination works, small size mobile treatment units are available, such as pre-conditioned columns and cartridges, capable of treating low and medium activity effluent. Forests and trees surrounding the cities need to be treated to reduce the background radiations. A concept of nuclearized biomass incineration plant is under study, to burn the contaminated trees and agricultural crops together with organic tsunami waste. Linked with a cogeneration unit, this plant produces electricity and heat, which will help resuming local economy development. Off gas and ashes are trapped and conditioned using technologies coming from our nuclear installations.