I have a cylindrical molten salt reactor input file that runs correctly, and the output file gives me two diffusion coefficients "CMM_DIFFCOEF" and "INF_DIFFCOEF" from the two calculation methods noted in the output parameters page http://serpent.vtt.fi/mediawiki/index.p ... arameters .

I was wondering, it is possible for serpent to compute different regions of a reactor according to input geometry?

To illustrate using the picture below, I want to calculate the diffusion coefficients for 1) the volume of the

*inner*core, and 2) other "n" cylindrical sectors extending outwards the reactor core to "nodalize" my results.

I know I can compute macroscopic cross sections for a region of the core by defining a detector and an MT number throughout the reactor, but I'm not certain on computing the diffusion coefficient at a specified region. The reactor design is non-homogenous extending outward of the core, so my understanding is that different sections should have different diffusion coefficients.

Any path forward?