[en] Today's trend of building large desalination plants, consuming large quantities of heat, has raised the question of having a reliable, continuous, large and cheap heat source to be coupled with such desalination plants. The nuclear energy offers a good answer to this question. The Multi-Stage Flash (M.S.F.) process for desalination of sea water offers a good possibility to be coupled to any nuclear power reactor heat cycle. This is mainly the case because of the low quality heat (low temperature and pressure) required for such a process. The brine heater of a M.S.F. plant can be arranged or placed in the cooling cycle of the power generating turbine. This can add an economic advantage on both desalination water costs and the generated electrical cost. (orig.)