ROSATOM announced that on 18 January, the vessel of the world’s largest multipurpose fast neutron research reactor was installed in its designed position at the Research Institute of Atomic Reactors construction site in the city of Dimitrovgrad in Russia’s Ulyanovsk region. RIAR is a part of ROSATOM’s scientific division Science and Innovation. This is one of the key events in assembling the reactor plant and will make it possible to finish installing the dome of the reactor building.The MBIR reactor vessel is a unique product with a length of 12 metres, a diameter of 4 metres, and a weight of more than 83 tonnes. It was delivered to the site in April 2022 – 16 months ahead of schedule. The equipment was manufactured at the Rosatom’s Atommash plant in the city of Volgodonsk in Russia’s Rostov Region.The reactor’s construction at the RIAR site is a project of immense importance that makes it possible to both expand the scientific and production capabilities of Rosatom and the nuclear industry as a whole over the next fifty years, as well as make it possible to carry out socially significant projects in the city and the region, including the construction of a new low-rise residential building for highly qualified experts and scientists.