[DennisP]

The D-He3 reaction itself is aneutronic. Overall, Helion's reactor would produce only 6% of its energy as neutron radiation, compared to 80% for D-T reactors. For Helion that means they extract electricity directly from fast-moving charged particles instead of using a heat cycle. In practical terms that's often what people are thinking about what they refer to aneutronic fusion.

The NRC and their UK equivalent have already been moving towards lighter regulation for fusion reactors, and that's for D-T reactors. A reactor like Helion's could well be regulated more like medical devices than fission reactors.