Fuel Storage And Handling

The stable fuel components are easy to store; tritium is handled with containment and accounting because it is radioactive and mobile.

Two classes of fuel material

Fusion fuel divides into stable and radioactive components. Deuterium and helium-3 are stable, non-radioactive, and stored like ordinary gases. Tritium is radioactive, chemically identical to hydrogen, and able to move into water and materials, so it is the component that governs storage design.

How tritium is managed

Tritium is kept in closed systems, often bound in metal hydrides that hold it safely, with multiple containment barriers and continuous accounting. Its low-energy beta emission cannot penetrate skin from outside, and its short half-life limits how long any release would persist. The working inventory at any moment is small.

• Deuterium and helium-3 stored as ordinary stable gases
• Tritium held in closed systems with layered containment
• Metal-hydride storage binds tritium securely
• Small working inventory limits any consequence

Scope note

Detailed safety barriers are covered in the safety-case pages; here the point is that the fuel itself is easy to store, with tritium the only component needing special care, and even that on a small scale. See fuel logistics and tritium inventory and decay.

The easy majority and the careful minority

Most of the fuel inventory — deuterium and helium-3 — is stable and stored without special measures, so storage design concentrates on the one radioactive component. Tritium is kept small in quantity, bound in metal hydrides, and wrapped in layered containment with continuous accounting. Because its emission is weak and its half-life short, even the careful minority of the inventory presents a modest, well-bounded task.