BALL FUEL ELEMENT OF NUCLEAR REACTOR Russian patent published in 1997 - IPC

FIELD: nuclear power plants which have water-cooled reactors. SUBSTANCE: heat from ball fuel elements is removed by means of pumping water through active area. Diameter of ball fuel element D depends on energy intensity in core $$$ using equation which contains values of central core energy emission q, permissible fuel temperature $$$, maximal fuel temperature $$$, central core radius r, heat- carrier volume ratio e, heat conductance of protection shield $$$, heat conductance of contact layer $$$, equivalent depth of protection shield $$$, depth of contact layer $$$, fuel element size d and effective heat conductance of fuel element $$$. In addition ball fuel element has central core which is embraced by graphite fuel matrix in which small-size fuel elements are dispersed. In addition fuel element has peripheral region with protection shield. Central area contains neutron capturing material which amount depends on neutron-physical characteristics using equation which contains load of neutron capturing material in ball fuel element G, maximal capture section of neutron capturing material $$$, maximal density of neutron capturing material C, capture factor A, factor B which is equal to estimation of other elements in neutron capturing material, and neutron capturing material volume V. EFFECT: increased functional capabilities. 3 cl, 3 dwg, 1 tbl