From Nuclear Waste to Clean Hydrogen

Turning water,
into energy

What if the radiation from used nuclear fuel wasn't just something to manage… but something we could actually use?

At RenU Fuel Solutions, we turn nuclear waste into clean hydrogen and valuable medical isotopes by using its own radiation to split water molecules in a controlled system.

Discover the technology Meet the team Latest news

Up to 400×

more hydrogen from water

~€2/kg

hydrogen at half the cost of renewables

−50% CO₂

vs. conventional renewable hydrogen

Spent nuclear fuel — is not waste·Radiolysis — the reactor was always there·Clean H₂ — without electrolysis·Medical isotopes — co-produced upstream·~€2/kg — REPowerEU-aligned·

Interactive model

Explore the ÆTHER Cell reactor

Interactive 3D simulation — walk around the reactor, adjust operating conditions, see radiolysis in motion.

ÆTHER Cell Technology

From traditional design to the optimized reactor

Three fundamental limitations of conventional design — removed.

Traditional configuration

ÆTHER Cell Reactor (RenU)

Zircaloy cladding

Radiative flux attenuated by a diffusion barrier before reaching the reactant.

→

Barrier-free medium

Fuel dissolved or in fine suspension — full radiative flux in the reaction medium.

Massive geometry

Severe internal diffusion limits with uncontrolled concentration gradients.

→

Sub-μm particle size

Maximized surface-to-volume ratio; internal diffusion resistance negligible.

Heterogeneous system

Minimal source/water interaction area and sub-optimal radiative coupling.

→

Quasi-homogeneous medium

Optimal source/H₂O coupling with maximized radical kinetics.

The concept

A reactor that was always there

"If hydrogen generation exists [G(H₂)] and can be amplified, the phenomenon is not a parasitic effect — it is a reactor whose operating conditions have never been optimized."

The reframed problem

Literature reports H₂ generation from spent fuel — treated only as a parameter to control and limit.

The new reading

Through a chemical-engineering lens, the same data says: spent fuel generates H₂ with a measurable yield.

The conclusion

The system is not a constraint — it is a reactor whose operating conditions were never optimized.

Value chain