Dutch Company Thorizon Conducts Material Testing for Molten Salt Reactors

Recently, Dutch nuclear startup Thorizon, in collaboration with the Netherlands Organisation for Applied Scientific Research (TNO), officially launched corrosion resistance and radiation resistance testing of structural materials for molten salt reactors (MSRs), marking a key step toward commercial application of this innovative reactor technology.

It is reported that molten salt reactors, with advantages including near-atmospheric pressure operation, passive safety, and reduced long-lived radioactive waste, are becoming an important technology option for clean power supply to data centers and heavy industry. However, corrosion of metal structures by high-temperature molten salt and material performance degradation caused by intense internal radiation have long been core engineering challenges constraining the widespread deployment of this technology.

To overcome the material degradation bottleneck, Thorizon has innovatively abandoned the traditional integrated vessel design and developed a modular reactor architecture equipped with sealed, replaceable "Cartridge" components, with plans to replace the internal molten salt module entirely every 5 to 10 years. Currently, TNO is conducting rigorous load testing and failure boundary assessment of candidate metal alloys, and the resulting scientific data will provide key safety basis for the subsequent construction of the PIONEER experimental reactor and the commercial unit Thorizon One in Petten, the Netherlands.

The R&D project has also attracted participation from multiple institutions including Delft University of Technology, NRG PALLAS research organization, the French Alternative Energies and Atomic Energy Commission (CEA), and the European Commission's Joint Research Centre. If testing successfully verifies the long-term durability of the alloys and the reliability of replaceable modules, it will strongly accelerate the advancement of molten salt reactors toward substantive industrial application.