université de montréal développement de la méthode des ...

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method of characteristics. The following points were looked at:
• the issue of the particle conservation when anisotropic scattering is considered
and the constraints that it imposes on the numerical integration procedure,
• the issue of the spatial integration scheme,
• the issue of the algorithmic strategy for the flux integration and the necessity
(or not) to introduce an asymptotical treatment.
A testing procedure of these methods on realistic configurations of nuclear reactors
was used in order to validate the software developments. Three studies were
carried out on different geometries. In two cases corresponding to BWR-MOX and
CANDU NG geometries, the characteristic method validation was performed along
with the validation of different self-shielding models. The last case was oriented
towards the definition of a computational scheme for production calculations on
PWR assemblies.