Multi-layered radiation shielding analysis in a Molten Salt Reactor

Molten Salt Reactors (MSRs) represent an innovative advancement in nuclear energy technology, distinguished by their numerous advantages and potential as a future option for safe and sustainable nuclear energy. In this context, optimizing radiation shielding design in MSRs requires careful consideration of variables such as the reactor's fuel cycle, operating temperature, and neutron spectrum. In terms of neutron spectrum, this study focuses on the analysis of a proposed multi-layered radiation shielding model for a 50 kWth micro-MSR. On this purpose, the reactor was modeled and simulated using SERPENT 1.1.7 Monte Carlo program, enabling the determination of neutrons generated during operation. These neutrons were then utilized as inputs for secondary simulations performed with GEANT4 and FLUKA to evaluate neutron and gamma-ray interactions with the reactor's shielding layers, including secondary radiation effects. The findings of this study provide valuable insights into the design of efficient multi-layered shielding systems, highlighting their effectiveness in radiation shielding and supporting the safe deployment of micro-MSR technology. This work contributes to the growing body of knowledge aimed at advancing MSR development and paves the way for future research into optimizing shielding designs for innovative reactor concepts.