This four days introductory class was intended to give nuclear data evaluators and users an introduction to using the open-source codes FUDGE and GIDIplus (available from https://github.com/LLNL/fudge and https://github.com/LLNL/gidiplus) to generate and use nuclear data in the Generalised Nuclear Database Structure or GNDS.

FUDGE is a code (primarily written in Python) developed by Lawrence Livermore National Laboratory (LLNL) to manage generating, checking, visualising, processing, and using nuclear data libraries. The name stands for "For Updating Data and Generating Evaluations". It is primarily intended for use with data stored in Generalised Nuclear Database Structure (GNDS) files.

GIDIplus is a C++ API that supports reading and writing GNDS-formatted nuclear data. It also supports Monte Carlo sampling.

FUDGE is designed as a tool to support nuclear data evaluators, processors and users while GIDIplus is designed mainly for use by radiation transport codes.

Time was available to discuss individual questions and problems with FUDGE/GIDIplus developers. Details on more advanced topics was discussed at the request of participants.

The class was based on the latest versions of FUDGE and GIDIplus

Topics included:

• an overview of how data are organised in GNDS files;
• a description of the FUDGE code including installation and basic use;
• an explanation of various scripts released with FUDGE to aid evaluators and users;
• a demonstration of using FUDGE to access, check and visualise GNDS data;
• special topic on translating ENDF-6 into GNDS;
• a demonstration of using FUDGE to generate GNDS-formatted evaluations;
• explanation of the "processProtare" script, used to generate processed data libraries;
• using "map" files to assemble GNDS files into a library; and
• an introduction to using GIDIplus to access and sample GNDS nuclear data.

Note aux participants français : l'OCDE/NEA n'est pas un centre de formation. Pour cette raison, les frais d'inscriptions sont dus avant le début de la prestation et il ne sera pas établi de convention de stage.