METHOD FOR PRODUCING HEAT ENERGY IN HEAVY NUCLEI FISSION BY SLOW NEUTRONS Russian patent published in 1997 - IPC

FIELD: nuclear power engineering. SUBSTANCE: used as nuclear fuel in nuclear reactors are fissionable isotopes of primarily highly enriched uranium-235 or plutonium-239 whose mass content m1 in each batch of newly charge fuel is chosen relative to its impurity content m2 within the range of 1 ≅ (m1 + m2)/m1 ≅ 1,05. Fuel specific energy intensity e1 is maintained relative to maximum permissible energy intensity e2 within the range of 0,35 ≅ e1/e2 ≥ 0,65. Fission reaction of newly charged fuel is carried out for each batch in steps during n cycles whose quantity for single batch of fuel is chosen within the range of 2 ≅ n ≅ 5. During each reaction cycle, content m3 of fission fragments to be removed from fuel relative to fuel quantity m4 in reactor is brought to value ranging within 0,8 ≅ m³/m⁴ ≅ 0,99. Then fuel or its part m5 is removed from reactor within the range of 1,2 ≅ (m5 + m4)/m4 ≅ 2 and conveyed to radiochemical recovery and isotope enrichment system built up primarily of chain of centrifugal machines to clean it from foreign impurity content m6 within the range of 1 ≅ (m6 + m5)/m5 ≅ 1,05. Recovered fuel is recharged in reactor and, if necessary, source fuel is added; fission reaction goes on and maximum content of fissionable material m7 is maintained in reactor within the range of 1 ≅ (m7 + m8)/m8 ≅ 1,05, where m8 is total amount of fuel in reactor. EFFECT: facilitated procedure.