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FEBEX has the multiple objective of demonstrating the feasibility of manufacturing, handling and assembling the engineered barriers and of developing numerical models and codes for assessment of the thermohydro-mechanical and thermo-hydro-geochemical behaviour of the near field of a deep geological disposal facility for high level radioactive waste. These objectives require integrated theoretical and experimental development efforts. The experimental work comprises three parts: an “in situ” test, a “mock-up” test and a series of laboratory tests. The experiment is based on the Spanish reference concept for crystalline rock, in which the waste canisters are emplaced horizontally in drifts, surrounded by a barrier of high density compacted bentonite blocks. In the two large-scale tests, the thermal effect of the waste is simulated by means of heaters (two heaters in each test); hydration is natural in the “in situ” test …