The intensively economic development in few Asian countries especially imposes the increase of electric energy consumption for which the conventional resources are not enough or are missing. Relatively recent discovery of thorium deposits has re-launched a type of nuclear reactors that uses mixtures of molten salts as fuel. Breeder molten salt reactors suppose the use of new types of steam generators; this paper proposes an eddy current nondestructive examination method for the tubes from steam generator type reentry tube boiler, which presents high characteristics of thermal transfer and safety in exploitation.