CHANNEL TYPE REACTOR-CONVERTER WITH MOLTEN FUEL Russian patent published in 2017 - IPC G21C1/04 B82B1/00 

FIELD: nuclear energy.

SUBSTANCE: invention relates to nuclear power engineering, particularly, to developing a reactor-converter with molten uranium-plutonium fuel operating with an average reproduction factor high enough for fuel self-sufficiency. Reactor-converter is fed with a grade mixture of crude and fissile isotopes of uranium and plutonium with the content of fissile isotopes not more than that in the spent nuclear fuel (SNF) of light-water reactors, as well as with waste uranium, so the reactor does not require productions of the external fuel cycle. Use of polysilazane as the heat carrier improves neutron-physical characteristics of the fuel cycle, increases the reproduction rate. Channel type reactor-converter with the molten fuel consists of a low pressure housing with a core inside consisting of vertical columns of the side reflector and internals with installed in central holes of the internals columns process channels (PC) for the heat carrier passage and accommodating fuel assemblies (FA) with fuel elements (FE), the low-pressure housing is filled with the heat carrier, in which the core is submerged, the inner volume of the FA FE arranged in the process channels is filled with a liquid metal uranium-plutonium fuel, the FE upper ends are combined in the FA fission products accumulator, the FE ends are made connected with the FA cavity, the latter is made connected with an open cavity above the fuel being with it under common pressure, herewith the low-pressure housing is made from a high-strength titanium alloy, for example, of mark VT3-1, VT6, VT6S, VT14 or VT22, protected from inside with a nanoporous boron nitride-based composite, and the heat carrier is based on polysilazane of the following stoichiometric composition: Si₃¹⁵N₃C₁₂D₂₂. FA fission products accumulator comprises a nanoporous sorption material for removal of gaseous fission products and fission products with high steam elasticity, for example, based on SiAlON at the micro pores dispersion within the range of 5–15 Å, and the material absorbing fission products with low steam elasticity.

EFFECT: fuel self-sufficiency of the reactor.

8 cl, 1 dwg