Fokker-Planck Calculations Using Standard Discrete Ordinates Transport Codes

A method is developed for using standard discrete ordinates neutron transport codes to perform Fokker-Planck calculations in one-dimensional slab and spherical geometries. No modification of the codes is necessary and time-dependent, steady-state, forward, or adjoint calculations can be performed. It is shown that energy-angle integrated quantities such as energy and charge deposition profiles can be accurately and efficiently calculated for electrons. However, in certain types of problems, the number of groups required to converge the differential energy spectra can be prohibitively large.