New PHISICS Perturbation Method Module Verification Using the HTTR Neutronic Model

摘要

The perturbation theory has been implemented in the PHISICS package for all the geometries and approximations available in INSTANT. The results of the tests with the HTTR core show that also in presence of odd anisotropic scattering (Odd cross group scattering sources) the exact theory works well. The first order approximation instead can be accurate enough or diverges depending on the magnitude of the flux shape changes. Since the first order perturbation theory will be used for the quasi-static module further investigation on his behavior are needed to understand when a new adjoint and direct full flux calculations are needed.