openmc

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# Description This PR extend OpenMC capabilities to calculate kinetic parameters relevant to fissile systems with an external neutron source (i.e. ADS, reactor startup). The changes needed include calculating standard...

GuySten

## Description To calculate accurately the effective mean generation time $\Lambda_{eff}$, a technique alternative to the already implemented IFP is presented in [1]. It adds an artificial material with a...

OlivaresDarian

MPI crash with large activation meshes in get_microxs_and_flux

1

## Bug Description When using `openmc.deplete.get_microxs_and_flux` mesh sizes that are too large generate MPI errors related to an internal broadcast, even when not run using MPI. ## Steps to Reproduce...

azylstra

[Point Detector] Add relativistic kinematics and CM ↔ lab Jacobian

6

# Description This PR is the second step in breaking down the point detector tally project into smaller, reviewable pieces, following the large PR [#3109](https://github.com/openmc-dev/openmc/pull/3109) and the paper [Development and...

itay-space

## Description Libmesh only supports isotropic refinement which means if there is a bigger quad element it be eight smaller quad in the next step (for AMR ). But there...

magnoxemo

Add len() support to Meshes

1

## Description Sometimes it is helpful to know how many elements are in a `Mesh`. Right now there is no easy way to do this. I proposed implementing `__len__` for...

MicahGale

HexLattice docs does not agree with functionality

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While doing some model debugging with @pshriwise and @magnoxemo, we realized there's a discrepancy between what the `HexLattice` [docs](https://docs.openmc.org/en/stable/pythonapi/generated/openmc.HexLattice.html) states and what actually gets built. The `HexLattice` documentation for the...

lewisgross1296

In the current version of OpenMC, the Bateman equation includes loss terms due to spontaneous fission (as part of the total decay rate), but does not include gain terms where...

sigtryggur-hauksson

## Bug Description The get_activity() method of openmc.deplete.Results uses half life values from openmc/data/data.py (ENDF/B-VIII.0). My expected behavior was that the half life values of the depletion chain file are...

KungliKung

convert_to_multigroup to accept numbers for groups

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## Description currently the model.convert_to_multigroup accepts an arguement for groups It accepts strings and makes use of pre defined group structures. It defaults to use CASMO-2 I was wondering if...

jon-proximafusion