China is developing the world's first hybrid nuclear reactor‑accelerator capable of destroying even radioactive waste in its core.

China is developing the world’s first commercial subcritical accelerator-driven reactor

A new type of nuclear facility – an accelerator‑driven subcritical reactor (ADS) – has so far existed only as a laboratory prototype. Chinese scientists are now taking the first steps toward its industrial application.

What is ADS?
- Subcritical: there is no self‑sustaining chain reaction in the active zone.
- Initiated externally: a beam of high‑energy protons (or other particles) is accelerated to subluminal speeds and strikes a spallation target, producing neutrons that then “support” fission in the reactor.
- Advantages:
- Reduces the lifetime of long‑lived waste from hundreds of thousands of years to ~1 000 years.
- Enables use of thorium (which is almost ten times more abundant in the Earth’s crust than uranium).
- Burns uranium up to 100 times more efficiently than conventional reactors.

CiADS Project
- Organizers: Chinese Academy of Sciences and Institute of Modern Physics together with state nuclear companies.
- Name: China Initiative Accelerator‑Driven System (CiADS).
- Key components:
1. Superconducting proton linear accelerator (energy 250–500 MeV).
2. Spallation target made of liquid lead‑bismuth alloy.
3. Subcritical reactor cooled with a liquid metal to preserve the fast neutron spectrum.
- How it works: protons hit the target → millions of fast neutrons are produced → they enter the reactor and sustain a controlled chain reaction without risk of runaway self‑sustaining behavior.

Technical details
Parameter | Value
---|---
Total thermal power of prototype | ~10 MW (2.5 MW from accelerator + 7.5 MW from reactor)
Construction site | Guangdong, Huicheng City
Schedule: construction | 2021–2026 (accelerator installation completed in 2026)
First operational system | Expected 2027

Why is this important?
- Green and safe energy: ADS does not allow a self‑sustaining reaction, making it more predictable and less risky.
- Reduction of waste volumes: efficient conversion of long‑lived actinides into short‑lived isotopes essentially “reuses” U‑238 and reduces the burden on geological repositories.
- Thorium advantage: with a larger supply, thorium reactors do not depend on imported uranium.

What’s next?
China is preparing to become the first country to demonstrate a commercial megawatt‑scale ADS demonstrator. This opens the path to closed nuclear cycles and more sustainable use of planetary resources. In Russia work is already underway on other types of fast reactors (BREST‑OD‑300, MBIR), but their concept differs from China’s approach to ADS.