Different reactor types and the Belgian option

After a brief description of the main families of reactors: heavy water, H.T.G.R., light water and fast breeder reactors,the authors comment unfavourably on the conclusions of the working group 3 of the ''sages report'', concerning the Belgian choice of PWR until 1985. The same reflections are held on the engagements of Belgium into the breeder reactor project as an alternative after 1985. Considerations are given on the plutonium technology. (A.F.)