Concepts of establishing measurement models for NRTA procedures

Problems of materials accountancy appear in many fields of industry and technique. At the Karlsruhe Nuclear Reserch Center (KfK), questions of accountancy of nuclear material are a sphere of research. In the framework of the Karlsruhe nuclear fuel reprocessing project a computer program called PROSA was developed to apply truncated sequential tests to a given sequence of material accounting periods. Two essential innovations are the benefit of this paper. Firstly, two concepts for establishing realistic measurement models based on realistic data are introduced: the ''deductive way'' and the ''inductive way''. Despite the fact that the facility under consideration is assumed to be a so-called ''one-block model'', the plant is in a non-steady operating state. The restriction to ''one-block models'' is essential only for the ''deductive way''. Using the ''inductive way'', the degree of specification depends only upon the degree of specification of the available data set. The tool PROSA is used to evaluate realistic balance data according to the derived measurement models in more detail for the first time. Secondly, this evaluation can be regarded as a test of the measurement model under the assumption of a non-loss case