A Tow dimensional finite element diffusion code "DIFEM"

not registered; not registered; Matsuno, Yoshiaki*

A computer code ; "DIFEM" has been developed for solving neutron diffusion problem with a Finite Element Method, which has the following advantage points as conpared with the Finite Difference Method : (1)to perform a calculation with any mesh size in arbitrary regions (2)to treat any geometry. DIFEM code is programmed to treat two dimensional (RZ, XY, RO, Triangle) eigenvalue problems and to use the variable dimension to minimize the allocated memoty. A auto-mesh routine, plotting routine option and restart option are involved in the computor code to make mesh data and to save computing time. Input data should be written with "FIDO" format. Programs are written in "FORTRAN IV" language. The code description, and the input/output instruction will be stated in this report.