Shutdown of nuclear power plants

Using a pressurised water reactor as an example and assuming an allowable level for activated structural material the production of waste from the region of the reactor core is determined. The influence of the cooling time (time from the reactor-shutdown to the start at dismantling) and the amount of waste material is presented. An attempt is made, by comparison with conventional regulations to give a sound basis for evaluating and understanding the assumed allowable limits. Finally arising out of the study concerning the chemical composition of the materials in the core region and the layout of the biological shield some recommendations are made concerning the construction of future nuclear power plants. (Auth.)