The ECESS code calculates transport equation coefficients for the thermal energy monatomic gas model of a physical moderator. The parameters of the model are the ratio (M/m) of atomic mass to neutron mass> and the temperature Coefficients for these parameters are obtained through the P3 approximation. In addition the code calculates infinite medium spectra of the scalar flux. The scalar flux and neutron current spectra in large geometry may also be obtained and based on theses constants for a one group treatment of thermal neutrons are computed.
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