METHOD OF INSPECTION OF THE FUEL COLLISION OF THE SHELLS OF FUELS OF THE WORKED HEAT-FUEL ASSEMBLY OF TRANSPORT NUCLEAR ENERGY INSTALLATIONS Russian patent published in 2017 - IPC G21C17/00 

FIELD: physics.

SUBSTANCE: invention relates to a method for monitoring the fuel rod cladding of spent fuel assemblies (SFA) of transport nuclear power plants. In the claimed method, the SFA is placed in a sealed pencil filled with a gas coolant, heated with a sump with SFA, and the gas coolant is pumped out with radioactive gases leaving the SFA and a pair of residual moisture along a closed circulation circuit in series through an aerosol filter, an iodine-selective filter, a bubbler filled with an alkali solution, and a measuring chamber. They separate the radionuclides ¹³⁷Cs on the aerosol filter^{, 129}I - on the selective filter, ¹⁴C and residues ¹²⁹I ^- in the alkaline solution of the bubbler. Further, beta-radiometric measurements ⁸⁵Kr in the gas coolant, the measured radionuclide activity values ⁸⁵Kr with the established criteria for rejecting the defective fuel rods of spent fuel assemblies and determine the tightness of the fuel rod claddings of SFA.

EFFECT: increased accuracy of determining the volume beta activity ⁸⁵Kr in the gas coolant of heated SFA.

3 cl, 1 dwg, 4 tbl, 2 ex