BEAVRS/models/openmc

BEAVRS Input File Generator

The BEAVRS script has been developed to generate OpenMC input files. With this script it should be much easier to extract single elements of the geometry (e.g., single assemblies and pins) as well as make modifications to different parts of the geometry.

This script is dependent on OpenMC Python API.

Installation

This package can be installed with distutils via:

python setup.py install --user

Usage

Once the module is installed, it can be constructed in python:

from beavrs.builder import BEAVRS

model = BEAVRS()

model.write_openmc_geometry()
model.write_openmc_materials()
model.write_openmc_plots()
model.write_openmc_settings()

For convenience, also provided are a script make_beavrs.py to build the model and Jupyter notebooks extract-assm.ipynb and extract-pin.ipynb to extract single assemblies and pin cells of BEAVRS respectively.

For those looking to generate the input files for the 2D BEAVRS model and/or a model that is symmetric in the x-y plane, the -d and -s flags can be used with the make_beavrs.py script respectively. Details about these two models can be found below:

2D BEAVRS Model

The 2D BEAVRS model is created from the 3D model by creating a bounding box around the full core to restrict the problem to one assembly-width outside the outer-most assemblies (i.e. 17 assemblies wide) in the x-y direction, and a 10cm slice in the z-direction. The x-y surfaces have vacuum boundary conditions, while the 10cm slice is arbitrarily chosen in a non-grid spacer region with reflective boundary conditions. The initial source distribution is also updated accordingly.

Symmetric BEAVRS Model in x-y Plane

The only source of asymmetry in the x-y plane stems from the insertion of instrument tubes, so the symmetric model replaces all instrument tubes with empty guide tubes, similar to all other assemblies.