The McMaster Nuclear Reactor (MNR), located at McMaster University in Hamilton, Ontario, is Canada’s most powerful research reactor and one of the country's most important centers for nuclear research, isotope production, and education. Operating since 1959, the MNR plays a key role in medical isotope supply, neutron-based research, and the training of the next generation of nuclear professionals. Currently licensed for 3 MW thermal power, the reactor is undergoing preparations for a planned power upgrade to 5 MW.

As part of this effort, our project is providing advanced modeling and simulation support to ensure safe and efficient reactor operation during and after the power increase. Specifically, we are developing high-fidelity models that integrate neutronics, thermal-hydraulics, and thermo-mechanics, tailored to the specific characteristics of the MNR.

These models aim to provide a deeper understanding of the reactor's behavior under various operating conditions, optimize performance, and ensure compliance with regulatory requirements. The work includes detailed simulations of neutron flux distributions, coolant flow behavior, and thermal stresses in reactor components. This integrated approach will not only support the safe realization of the power upgrade but also enhance the long-term operational flexibility and scientific capabilities of the MNR. 

In 2023, a large-scale experimental campaign was conducted at MNR to provide experimental data to the nuclear research reactor community. This campaign focused on key parameters relevant to the planned power upgrade and reactor modeling, including neutron flux measurements and thermal-hydraulic behavior under operating conditions. The resulting dataset has already led to several scientific publications, e.g. https://doi.org/10.3390/en17194936, and serves as a valuable benchmark for validating the advanced simulation tools developed within the project.

Through this collaboration, the project contributes to the continued excellence of the McMaster Nuclear Reactor as a leading platform for nuclear research, isotope production, and education in Canada and beyond.

For more information please contact Christian Reiter or see McMaster Nuclear Reactor