Summary

• Antares Nuclear’s microreactor became the first advanced design to complete a criticality test under the DOE RPP.
• BWX Technologies manufactured and supplied the reactor fuel that powered the successful test.
• The demonstration clears the way for Aalo Atomics to pursue its own criticality milestone later this summer with support from Flowserve, another established constituent of the VettaFi Nuclear Renaissance Index.

By Steffan Szumowski

The U.S. nuclear sector reached a historic technical milestone earlier this month when Antares Nuclear’s Mark-0 microreactor achieved criticality at Idaho National Laboratory (INL). The June 4 demonstration marked the first time a privately