Chinese scientists have begun the final stage of installing the core components of a reactor that could fundamentally change how the world manages nuclear energy, with a system designed to eliminate the risk of meltdown while converting radioactive waste that remains hazardous for hundreds of thousands of years into material that decays within centuries.
Researchers at the Chinese Academy of Sciences (CAS) Institute of Modern Physics have started the final installation of superconducting particle accelerators at the China Initiative Accelerator Driven System (CiADS) facility in Huizhou, Guangdong province. The key accelerator components are expected to be fully installed by the end of 2026, with the system on track to become the world’s first megawatt-level waste-burning reactor when it goes online in 2027.
The CiADS is a hybrid system that pairs a nuclear reactor with a high-energy particle accelerator. Unlike conventional reactors, which rely on a self-sustaining chain reaction, this subcritical design requires a continuous external supply of neutrons to remain active. Superconducting linear accelerators fire high-current proton beams at approximately 80 percent the speed of light into a liquid lead-bismuth alloy, releasing a massive flux of neutrons that drives the nuclear reaction.
According to technical specifications published by the CAS Institute of Modern Physics, the full system is designed to deliver a total thermal power of roughly 10 megawatts, combining approximately 2.5 megawatts of beam power from a 350-metre-long superconducting linear accelerator with around 7.5 megawatts of reactor thermal output.
Turning Nuclear Waste Into Fuel
The technology addresses one of the most intractable problems in energy production. Some radioactive by-products of conventional reactors, known as actinides, can remain hazardous for tens of thousands to hundreds of thousands of years, creating enormous long-term storage and containment challenges for governments and operators worldwide.
The CiADS system is designed to convert uranium-238, typically considered waste from conventional reactors, into plutonium-239 through neutron bombardment, effectively turning spent fuel into new usable material while simultaneously transmuting long-lived radioactive waste into shorter-lived, less hazardous isotopes.
He Yuan, deputy director of the Institute of Modern Physics, told China’s Science and Technology Daily that the design represented what he described as an internationally recognised ideal approach to nuclear fuel breeding and waste treatment, adding that it could turn nuclear power into a stable energy source capable of supplying civilisation for a millennium. CAS claims the system burns uranium 100 times more efficiently than conventional reactors and could cut the hazardous lifespan of nuclear waste to less than one-thousandth of its current duration, though those performance figures have not been independently verified and no exact megawatt rating for the facility has been published.
A Built-In Kill Switch
The safety architecture of the reactor is as significant as its waste-burning capability. Because the chain reaction in an accelerator-driven subcritical system cannot sustain itself without the external particle beam, operators can instantly halt all nuclear activity by switching off the accelerator. This physically eliminates the conditions that led to disasters such as Chernobyl and Fukushima, where runaway chain reactions could not be stopped quickly enough to prevent catastrophic damage.
While the concept of accelerator-driven subcritical systems has existed since the 1980s, no commercial versions are operating anywhere in the world. China began its dedicated research programme in 2011 and by 2021 had developed a prototype accelerator that the institute described as the first to reach operational intensity suitable for potential industrial application.
Relevance for Africa’s Nuclear Ambitions
The breakthrough carries particular relevance for countries on the African continent that are actively building nuclear energy programmes. Ghana has selected China National Nuclear Corporation (CNNC) as the vendor for a 1,200-megawatt large reactor planned as part of its national nuclear power programme, with the government targeting one gigawatt of nuclear capacity integrated into the national grid by 2034. The technology demonstrating that China’s nuclear sector can pioneer globally significant innovations in both reactor safety and waste management may factor into how African governments assess Chinese nuclear partnerships as those programmes advance.
