NUCLEAR REACTOR Russian patent published in 1997 - IPC

FIELD: nuclear energy engineering. SUBSTANCE: nuclear reactor has active core composed by fuel rods and part of them is made with nonsymmetrical fuel material distribution, fuel rods are stuffed by fuel material of different type and different nuclide concentration, besides they are placed so that with respect to plate which includes central longitudinal axis of fuel arrangement this arrangement is divided for two parts with different volume averaged concentration value of nuclides in fuel material. Fuel rods are oriented such a manner that its subzones of nuclides lower concentration are directed to central longitudinal axis of active core, but fuel rods of peripheral row neighboring to side reflector can have opposite direction of nuclides content, namely, lower nuclides concentration subzone is placed farther from central longitudinal axis. Part of different type of fuel rods which forms nonsymmetric fuel rods content can include burnable poison at least. EFFECT: more effective energy release. 3 cl, 2 dwg