The "safest fuel
on Earth*"

According to the U.S. Department of Energy, "Triso Particles: The Most Robust Nuclear Fuel on Earth."
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Uranium core
Porous carbon buffer
High-density carbon
Silicon carbide

Triso Particles

The fuel is made from enriched uranium, packaged in the form of "Triso" particles: a uranium core coated in carbon and ceramic layers (all measuring less than 1 mm in diameter).
These particles are considered to be the "safest fuel in the world."

Graphite compacts

Dans le cœur d’un micro-réacteur Jimmy, les particules Triso sont contenues dans des compacts : un mélange entre une matrice en graphite et les particules Triso. Il s’agit de cylindres d’environ 2,5 cm de hauteur et 1 cm de diamètre.
Triso particles mixed withthe graphite matrix
Graphite matrix
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A fuel cycle that ensures safety and waste management.
Supply
The core of a Jimmy micro-reactor operates with uranium, which is sourced from reputable Western suppliers
Enrichment
The uranium must then be enriched to a level (~10% or 20%) corresponding to the model chosen by the industrial client. For its first generators, Jimmy has signed a contract with Urenco.
(Learn more)
Manufacturing of Triso particles and compacts
The enriched uranium is processed into Triso particles. Eventually, Jimmy will be able to perform this operation at its industrial platform in Le Creusot. For the first generators, Western suppliers have control over this process.
Use in the core of
the micro-reactor
For a generator that would last twenty years, a single fuel reloading will be scheduled after 10 years.
Control and management
of waste
The Jimmy generator is optimized so that the waste generated is compatible with the French waste management system. For example, our fuel assemblies are designed to either be either treated or directly disposed of, depending on national guidelines.

Jimmy has also optimized its design to minimize the amount of waste created: it would take 200 Jimmy generators to increase the amount of radioactive waste produced in France by just 1%.