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DeltaMed910

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- TL;DR Summary
- What codes can calculate diffusion coefficient D and thermal diffusion area L^2 of a given homogeneous, reflected sphere reactor?

For a novice research problem, I am approximating a system as a spherical reactor of homogenized natural uranium and heavy water, reflected by infinite graphite. I was attempting to find the critical mass and dimensions for it (very similarly to Lamarsh 3e Ex.6.7-8). To do so, I need to calculate the diffusion coefficients D and thermal diffusion area L^2 of the homogenized core and the reflector.

While Lamarsh lays out how to do it by hand, I am also interested in what codes can calculate this for a given mixture. I do not see any entries about diffusion parameters in the MCNP manual (I have a copy of MCNP6.2).

This source has pretty much what I'm looking for, a code that calculates thermal neutron diffusion parameters for arbitrary mixtures, but it seems to have problems with hydrogenous media.

https://inis.iaea.org/collection/NCLCollectionStore/_Public/27/017/27017643.pdf

While Lamarsh lays out how to do it by hand, I am also interested in what codes can calculate this for a given mixture. I do not see any entries about diffusion parameters in the MCNP manual (I have a copy of MCNP6.2).

This source has pretty much what I'm looking for, a code that calculates thermal neutron diffusion parameters for arbitrary mixtures, but it seems to have problems with hydrogenous media.

https://inis.iaea.org/collection/NCLCollectionStore/_Public/27/017/27017643.pdf