OpenMC Data

Aims to facilitate the use of different nuclear data libraries with OpenMC by providing command line tools that process and download nuclear data automatically.

Prerequisites

You should have already installed OpenMC, see the docs for installation instructions.

Installation

The package is distributed on PYPI and can be installed with pip.

pip install openmc_data

Usage

Once installed several scripts are available in your terminal that are able to download and process nuclear data.

The scripts accept input arguments, to find out the input arguments available for a particular script run the script name with --help after the name. For example:

convert_endf --help

Some scripts (mainly the generate scripts) require NJOY to be installed and added to your path.

A few categories of scripts are available:

• Scripts that produce h5 cross section files:
• Convert ACE files to h5 files
• Generate h5 file from ENDF files
• Download h5 files
• Scripts that produce xml chain files:
• Generate xml chain files from ENDF files:
• Download xml chain files:
• Other scripts that don't fall into either category.

Produce Cross Section Files

Convert cross sections

Script name	Library	Release	Processed by
convert_mcnp70	ENDF/B	VII.0	LANL
convert_mcnp71	ENDF/B	VII.1	LANL
convert_endf	ENDF/B	VII.1	NNDC
convert_lib80x	ENDF/B	VIII.0	LANL
convert_fendl	FENDL	3.2c 3.2b 3.2a 3.2 3.1d 3.1a 3.1 3.0 2.1
convert_jeff32	JEFF	3.2
convert_jeff33	JEFF	3.3
convert_tendl	TENDL	2015 2017 2019 2021

Generate cross sections

Script name	Library	Release	Processed by
generate_cendl	CENDL	3.1 3.2
generate_endf	ENDF/B	VII.1 VIII.0	NNDC
generate_fendl	FENDL	3.2b 3.2a 3.2 3.1d 3.1a 3.0
generate_jendl	JENDL	4.0 5.0

Download cross sections

Script name	Library	Release	Processed by
download_endf	ENDF/B	VII.1 VIII.0	NNDC
download_tendl	TENDL	2019 2021

Produce Depletion Chain files

Generate chain files

Script name	Library	Release
generate_endf_chain	ENDF/B	VII.1 VIII.0
generate_jeff_chain	JEFF	3.3
generate_jendl_chain	JENDL	5.0
generate_tendl_chain	TENDL	2019 2021
generate_serpent_fissq
generate_endf71_chain_casl	ENDF/B

Download chain files

Script name	Library	Release	Branching options
download_endf_chain	ENDF/B	VII.1 VIII.0	None SFR PWR

Other scripts

Script name	Description
convert_tendl_rand	Download random TENDL libraries from PSI and convert it to a HDF5 library for use with OpenMC. Only certain nuclides are available from PSI. This script generates a cross_sections_tendl.xml file with random TENDL evaluations plus a standard library located in 'OPENMC_CROSS_SECTIONS'
sample_sandy	This scripts generates random (gaussian) evaluations of a nuclear data file following its covariance matrix using SANDY, and converts them to HDF5 for use in OpenMC. Script generates a cross_sections_sandy.xml file with the standard library plus the sampled evaluations.
make_compton
make_stopping_powers
add_branching_ratios	add branching ratios for n,gamma reactions to a preexisting chain files.
reduce_chain
combine_libraries	Combines multiple cross_section.xml files into a single cross_section.xml.