Research on a method for self-shielding calculations based on IGA-method

An innovative calculational method for neutron transport is described. This code uses a particular method to treat the spatial domain. This code allows to perform nuclear reactor physics evaluations for any arbitrary geometrical domains compared to conventional calculational methods that use commonly only ideal shapes (cylinders, spheres, plates,...) to describe the spatial domain. This new method is based on the Iso-Geometric Analysis. To tract the energy variable we use the Multi-group method, so it is essential to make self-shielding calculations to take into account the resonance phenomenon of cross sections to determine correctly and accurately the behavior of the core and the safety parameters. The self-shielding method that we use is based on a subgroup method developed by P.Ribon, known as method of the moments. This method replace the punctual micro cross sections by a density of probability that can be described by a quadrature set named probability table. It is also relevant to present this probability tables and the method to create them. From now, we have calculated our probability table and we will show their validity by making a comparison of the cross section calculated with the probability table and with an other method. (author)