Japan’s Atomic Energy Agency and Kazakhstan’s National Nuclear Centre have signed a memorandum of cooperation to undertake a fourth phase of the EAGLE project — a long-running joint research programme on core safety experiments for sodium-cooled fast reactors — marking a new chapter in nuclear technology collaboration between the two countries.
NNC RK Director General Erlan Batyrbekov and JAEA President Masanori Koguchi signed the agreement, which initiates the EAGLE-4 project covering several in-pile experiments at NNC RK’s IGR research reactor, twelve out-of-pile experiments at the EAGLE test bench, and a series of small-scale tests. The main objectives are to test fuel assemblies for advanced Japanese Generation IV reactors, conduct research at NNC RK facilities, and provide a scientific basis for safety assessment of advanced nuclear technologies. NNC RK is in discussions with JAEA on extending the project through to 2031.
The EAGLE programme began in the early 2000s and has now completed three phases. Across those phases, approximately 200 preparatory tests, two intermediate-scale and nine full-scale reactor experiments, and more than 65 out-of-pile tests were carried out, collectively confirming that molten fuel is promptly discharged from a reactor core in the event of a severe accident — a key safety finding for the development of next-generation sodium-cooled fast reactor technology.
The programme sits within Japan’s broader strategic effort to revive fast reactor development after a prolonged pause. Japan’s government decommissioned the Monju sodium-cooled fast reactor in 2016 following a series of technical problems, including a sodium coolant leak in 1995. A strategic roadmap adopted by the Cabinet in 2018 and revised in 2022 selected sodium-cooled fast reactors as the target for a demonstration reactor conceptual design, with a demonstration fast reactor planned for operation by 2050.
Fast neutron reactors offer substantially more efficient use of uranium resources than conventional power reactors and can burn actinides — characteristics that make them attractive for long-term energy security and waste management. For Kazakhstan, the EAGLE collaboration provides both scientific engagement and a demonstration of the country’s growing role as a partner in advanced nuclear research, complementing its dominant position as the world’s largest uranium producer.








