Russia, Ulyanovsk Oblast, Dimitrovgrad

Multipurpose Fast Neutron Research Reactor MBIR


MBIR is a multipurpose fast-neutron research reactor with capacity of 150 MWt and maximum neutron flux density 5.3*1015 n/cm2s which is currently under construction at JSC “SSC RIAR” in Dimitrovgrad, Ulyanovsk Region. MBIR is the largest research reactor under construction in the world. MBIR is a multipurpose facility, it will allow to expand scientific studies in a various number of areas including the following:

• testing of advanced structural and absorbing materials in support of the development of Generation IV technologies;

• research into advanced fuel, fuel elements and technologies for closing of nuclear fuel cycle;

• production of isotopes and raw materials for radiopharmaceuticals, as well as the development of modified materials;

• research with the use of neutron beams in the field of medicine, fundamental and applied physics.


MBIR core will be equipped with:

• 14 non-instrumental channels for material test assemblies and irradiation devices placement;

• 3 instrumented experimental channels;

• 3 independent loop facilities filled with three different types of coolants: lead/lead-bismuth, sodium, helium. It will allow all the partners to conduct research in one reactor but in three different environments.
Additionally outside the reactor vessel there will be:

• 6 horizontal channels to get neutron beams out of the reactor for use in nuclear medicine, neutron radiography and tomography;

• 8 vertical experimental channels for irradiation tests of products whose irradiation resistance is moderate and for neutron transmutation of materials (neutron-transmutation doping of silicon).


Under construction: since 2015
Commissioning: 2027-2028







Fundamental Physics
High Energy Physics

Key words: Fundamental Studies, Isotopes Production, Nuclear Medicine Development, Fuel Elements Testing, Construction Materials Testing, Testing of New Equipment and Nuclear Technologies of Generation IV, Solutions for Closing of Fuel Cycle.




The main goal is to develop and implement next-generation nuclear energy systems



To provide irradiation experiments, the reactor facility is designed with the following necessary equipment and instrumentation:

• pick-and-place mechanisms and machines for loading and reloading experimental devices and loop facilities;

• stands for washing and storing various kinds of experimental devices and loop facilities with controlled temperature conditions;

• research stands in the spent fuel pool for detecting fuel cladding failure and for carrying out tests simulating conditions of deteriorating heat dissipation.

• research safety hot cells with equipment and facilities for assembly and disassembly of irradiation devices, as well as for initial investigations (geometrical measurements of irradiated samples, filming and photography, gamma scanning, measurements of corrosion thickness).


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