As far as I've observed, the modeling codes tend to grow in complexity with capability of the times. For example, while a 2D model might have been used in the early 90s, if it were used now additional factors would be incorporated to provide more detailed analysis.In the early 90s, there was a code called TWODANT (two dimensional diffusion accelerated neutron transport). I remember it would run on a modest PC and would give pretty good results. Don't know if it is used much anymore.
So sorry, I only read your question more than a month later.I have the source code of Dragon but I don't know how to compile it on Windows OS.
I've tried to compile it using Intel Visual Fortran Compiler 11 but I got many errors.
do you know any solution?