US approves Part 53 — first new reactor licensing framework since 1989 covers MSRs

The NRC approved Part 53 on March 25, 2026, the first new reactor licensing framework since 1989. The technology-inclusive framework explicitly covers molten salt reactors, HTGRs, and microreactors. The NRC estimates application costs reduced by 50% or more, with design approval possible in 18 months.

25 March 2026