Central investigations and evaluation of current issues with regard to pressure-retaining plant components of nuclear power plants in power operation. Lot 2: Research-related topics. Report on work package 1

Within the framework of a research contract of the BMU with the reference number 4717R01371, we have investigated in work package 1 the status of current research on the material requirements for fuel assemblies and possible effects on the currently valid material requirements for fuel assemblies in German nuclear power plants. First, a review of the national and international state of knowledge of the requirements for materials is carried out on the basis of the regulations. These requirements on the materials of the fuel assemblies describe a range within which operation of the nuclear power plants with the fuel assemblies is permissible. This permissible range is upstream of the respective failure or damage limits.