The JAERI thermal reactor standard neutronics design code system, SRAC has been developed at JAERI to establish an overall neutronics calculation code system. While incorporating the conventional transport and diffusion codes, SRAC is characterized by application of the collision probability method on the resonance absorption and the cell calculations over the whole neutron energy. A comprehensive set of collision probability routines for 13 types of geometries yields wide application of SRAC to almost all types of thermal reactors. Since the functions have been qualified through a wide range of benchmark calculations, SRAC has been used for neutronics design of the core conversion of JAERI research and test reactors and the analyses of critical experiments performed at JAERI and domestic universities. Recent modifications of methods and data extend its applicability to HCLWRs cores.
An intelligent reactor design system IRDS has been developed to support conceptual design of new type reactor cores in the fields of neutronics, thermal-hydraulics and fuel behavior. The features of IRDS are summarized as follows: 1) a variety of computer codes to cover various design tasks relevant to "static" and "burnup" problems are implemented, 2) all the information necessary to the codes implemented is unified in a data base, 3) several data and knowledge bases are referred to in order to proceed design process efficiently for non-expert users, 4) advanced man-machine interface to communicate with the system through an interactive and graphical user interface is equipped and 5) a function to search automatically a design window, which is defined as a feasible parameter range to satisfy design requirement and criteria is employed to support the optimization or satisfication process.Applicability and productivity of the system are demonstrated by the design study of fuel pin for new type FBR cores.
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