Neutron simulation tools
Tiret rouge

Development and validation of neutron simulation tools for the JHR.​​

Découpage radiale du cœur du RJH avec le solveur cœur CRONOS2 - carré © IRESNE/CEA

The Reactor Physics & Fuel Cycle Section (SPRC) is responsible for developing and validating the neutronic simulation tools used to support the future experimental programme in the Jules Horowitz (RJH) material testing reactor.

The HORUS3D/N calculation tool has been developed and updated since 2000 to meet nuclear safety and reactor design requirements. It is used to assess the main neutronic parameters of the JHR, i.e.: core reactivity, reactivity worth of the control rods, power distribution, etc.

HORUS3D/N modelling relies on the functionalities of various neutronic computer tools at the DES (APOLLO2, CRONOS2 and TRIPOLI4). The developments have made it possible to incorporate recommendations resulting from neutronic studies on the light water reactor fleet.

The validation of HORUS relies specifically on the AMMON test programme performed in the EOLE critical mock-up at Cadarache, which is currently shut down. This calculation tool has been delivered to the future operator of the JHR, as well as to TechnicAtome, the architect-engineer of JHR.

Based on the HORUS3D/N tool, the DER/SPRC was able to develop the core management tool called OSCAR to meet the needs of the future operator: verification of nuclear safety parameters, operational monitoring, fuel loading management, etc. This tool also includes a human-machine interface (HMI) defined in close collaboration with the team of operators.

The refined characterisation of future experiments in the JHR is a major challenge, which has initiated the development - still ongoing - of a simulation tool specifically for the irradiation devices. This simulation tool will be based on the latest-generation APOLLO3® multi-technology calculation tool.