This is a minimal Python package that provides both command line and API interfaces for converting OpenMC h5 nuclear data files into JSON files for each reaction.

This is useful for building a nuclear data database where JSON files are commonly accepted inputs. This tool is used for the generation of the xsplot.com database.

Python API usage

Extracting a single reaction from the h5 file using the API and saving as a JSON file.

import openmc_data_to_json as odj

odj.cross_section_h5_file_to_json_file(
    filename='tests/Li6.h5',
    output='tritium_production.json',
    reaction='(n,Xt)'
)

It is also possible to return the h5 info as a dictionary with keys for 'cross section', 'energy', 'element' and other info on the nuclius

import openmc_data_to_json as odj

reaction = odj.cross_section_h5_to_json(
    filename='tests/Be9.h5',
    reaction='(n,2n)'
)
print(reaction)

A h5 file can be checked for reactions to see if particular reactions exist

import openmc_data_to_json as odj

reactions = odj.reactions_in_h5(filename='tests/Be9.h5')
print(reactions)
assert '(n,gamma)' in reactions

Command line usage

Another use of this program is to extract reactions using the command line tool.

openmc-data-to-json -i Be9.h5 -r (n,2n) -o my_reaction.json

• the -i or --input argument specifies the input h5 file
• the -o or --output argument specifies the output json filename
• the -r or --reaction argument specifies the reactions to extract.

Installation

The easiest way to install is to use the PyPi distribution.

pip install openmc_data_to_json