Molten Salt Reactor converts nuclear waste into electricity at 300-500 MWe capacity

Summary

Nuclea Energy, by acquiring Moltex Energy's molten salt reactor technology—including the Waste to Stable Salt (WATSS) process and two reactor designs, the fast-spectrum SSR-W and the thermal FLEX—is aiming to generate 300–500 MWe from spent nuclear fuel.

Why it matters

The deal tackles the nuclear waste problem chemically by separating transuranic actinides and using them as fuel, potentially reducing long-lived radioactive inventories. SSR-W's fast neutron spectrum and natural convection cooling promise a safer, water-free reactor that can operate without external power. Additionally, the high-temperature FLEX reactor could support synthetic fuel production and heavy manufacturing.

Highlights

• The WATSS process mixes extracted actinides with liquid chloride salts, preventing pure plutonium streams.
• SSR-W uses fixed fuel rods immersed in a coolant salt and fast neutron collisions to break down long-lived actinides.
• The FLEX reactor operates on low-enriched uranium, raising its coolant temperature to around 750 °C for industrial applications.

Critical take

The acquisition still requires regulatory approval from the UK and Canada, and assets were sold without extensive vendor guarantees; this creates uncertainty about the commercial readiness and scalability of the fixed-tube design.