[en] As about 75 nuclear reactors are to be definitely stopped between now and 2050 in Europe (29 in the US), nuclear facility dismantling is a growing issue which raises specific problems notably related to radiation protection. Specific techniques, means and processes have been developed by specialized operators, and French teams have developed a widely recognized know-how in this field. In October 2014, the French Academy of Sciences (Academie des Sciences) held a seminar on the nuclear facilities dismantling sciences and technologies, during which all the aspects of these disciplines have been discussed: characterization of radioactivity sources, radiation protection, logistics, physical chemistry, mechanics of continuous media, calculation codes, robotics, returns of experience, education and training, perspectives, accident management... A panorama is given of the dismantling needs and conditions, the key scientific phenomena, the on going research programs and the required researches for the future