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NJOY training participants

The NEA Data Bank Computer Program Service (CPS) has been conducting training activities for more than 30 years. These courses provide a unique opportunity to bring together code users from around the world, facilitating exchanges on the use of computer programs among users and with the code developers.

The NEA organsied the third NJOY course in collaboration with Los Alamos National Laboratory 1 to 5 December 2025 in Paris, France. The NJOY Nuclear Data Processing System is the most widely-used software package designed to create application-specific data for the majority of nuclear simulation software across the world. The class introduced participants to the Evaluated Nuclear Data File (ENDF) format using Application Programming Interfaces (APIs) and covered the primary modules of the software. The course gathered 19 participants from 10 countries.

The NEA also held an in-person training course on OpenMC on 24-28 November 2025 at the OECD offices in Paris, led by the core developer of the software from Argonne National Laboratory (United States). The course brought together 14 participants from France, Norway, Spain, Switzerland and South Korea and introduced them to the usage and application of OpenMC, an open-source Monte Carlo neutron and photon transport simulation code. The next OpenMC course will take place online in the second quarter of 2026.

OpenMC course participants 

The course on Analytical Benchmarks: case studies in neutron transport theory on 24-28 November 2025 was taught by Professor Barry Ganapol of the University of Arizona in Paris, France. The main objective of the course was to provide a basis for fundamental concepts of numerical evaluation of analytical solutions to a variety of neutron and neutral particle transport equations. The course brought together 22 participants from Argentina, France, Korea, Poland, Slovenia, Sweden, United Kingdom and Ukraine.

Participants of the training on Analytical Benchmarks: case studies in neutron transport theory

On 17-21 November, scientists and engineers gathered to the NEA to attend a training on SCALE/ORIGEN Standalone Fuel Depletion, Activation and Source Term Analysis, a computer program widely used for nuclear engineering and research. Some 22 participants from 11 countries benefited from the knowledge and dedication of the code developers team from the Oak Ridge National Laboratory.

SCALE/ORIGEN course participants

The SERPENT-2 in-person training course for beginners took place on 4-7 November 2025 and attracted nine participants from six countries. This five-day course introduced students to reactor physics applications and equipped them with the necessary skills to independently set up and run their SERPENT models. This highly demanded course will be organised again in the second quarter of 2026.

Participants of the SERPENT-2 training