ReactorSystem used to initiate, maintain and control a fission chai... BR2 (Belgian ReactorSystem used to initiate, maintain and control a fission chai... 2) is amongst the most powerful and flexible research reactors in the world. Since its start-up in 1962, the reactorSystem used to initiate, maintain and control a fission chai... has operated on uraniumNatural radioactive element with the atomic number 92. The n... with pressurised water as coolantAny substance used to remove the heat in a nuclear reactor. ... and moderatorMaterial used to "decelerate" fast neutrons to low energies,.... After maintenanceMaintenance and repair measures for apparatuses, machines an... and modernisation operations and IAEA’s SALTO Mission in 2017, BR2 is now permitted to operate until its next periodic safety review in 2026, when a decision on extending its operation for another ten years may be taken.