RT 3: Nuclear Simulations

Nuclear Simulations

Nuclear simulations are computational, mathematical, and physics-based models that replicate the behaviour of nuclear systems. These models analyse and predict the performance and safety of different types of nuclear systems without physical testing. By performing nuclear simulations, it is possible to deepen understanding of nuclear and technological system behaviour, enhance safety analysis, and predict the operational limits and boundary conditions of advanced reactor concepts. These simulations also support informed decision-making, optimize reactor design and performance, and assist with the planning, risk assessment, and safe execution of reactor operations and related activities.

In RT3, the research theme focuses on reactor-physics modelling, radiological scenario development and digital twin workflows that support nuclear system decommissioning, training and education, and operational planning. The growing global interest in and investment toward advanced nuclear technologies and next-generation reactors calls for expanded efforts in high-fidelity nuclear simulation and modelling. Strengthening this area of research enhances the technical foundation required to evaluate innovative designs, validate safety margins, and assess performance under a wide range of operating and accident scenarios. Such work increases stakeholder confidence to implement new nuclear systems, supports evidence-based regulatory and engineering decisions, and contributes to the development of robust infrastructure, supply chains, and operational frameworks around emerging nuclear technologies.

Nuclear Reactor Applications Group

The first work package is led by the newly established Nuclear Reactor Applications research group at the University of Oslo. The group focuses on advanced reactor concepts (Generation IV) and microreactor technologies, where advanced neutronics, novel fuel types, and compact core designs necessitate new modelling frameworks and experimental methodologies that differ fundamentally from those of large, stationary nuclear power plants.

Research on microreactors strengthens UiO’s contributions to non-proliferation, safety analysis, and regulatory science by generating the data, methodologies, and simulation tools required to assess, license, and safely deploy novel reactor classes. Microreactors require high-fidelity experimental validation and integrated multi-physics modelling—such as coupled neutronics, materials performance, and shielding interactions—tailored to emerging energy applications including remote and off-grid energy systems. A defining aspect of WP1 is the evaluation of microreactors for maritime and mobile nuclear propulsion for commercial marine vessels. This is supported by several student projects on propulsion concepts, safety characteristics, accident considerations, and advanced reactor designs for maritime.

The establishment of this group has significantly strengthened nuclear computational and analytical capabilities, particularly in Monte Carlo methods, multi-physics coupling, and shielding and source-term simulations. In addition, the group maintains strong expertise in nuclear fuel cycle analysis, passive reactor safety characteristics, reactor core optimization, and shielding design requirements, providing an integrated approach to advanced reactor research and development.