METHOD FOR DETERMINING TEMPERATURE OF VENTED FUEL ELEMENT CAN DURING ITS EXPERIMENTAL TRIAL IN NUCLEAR REACTOR Russian patent published in 2003 - IPC

FIELD: nuclear power engineering; development and trial run of vented fuel elements (including thermionic ones) in ground-based reactors. SUBSTANCE: method includes measurement of heat emission by fuel element and measurement of fuel element can temperature. For the first procedure measurements are made of heat emission q of fuel material condensate passed through ventilation system and condensed beyond fuel element as function of time. Dependence obtained is used to evaluate rate of change of heat emission by fuel material condensate τ for time moment of interest. Heat emission by fuel element Q is measured. dq/dτ pressure P in fuel element ventilation system is measured. Maximal temperature T of fuel material in fuel element is found from equation T = (M•dq/dτ•P•R/(A•(q+Q)•exp(-B/T))², and temperature of fuel element can T is calculated from expression , where M is original mass of fuel material in fuel element, kg; R is total resistance of ventilation system, 1/m; A and B are factors depending on type of fuel material, A[kg²/(m²•s³•deg^1/2], V[deg. ] ; λ is heat transfer coefficient of fuel material, W/(m x deg.); L_c is fuel core length, m; ε is original relative volume content of fuel material in fuel element; q[W],Q[W],τ[s],P[Pa],T_can[K],T[K]. EFFECT: enhanced measurement accuracy of fuel element can temperature. 1 cl, 5 dwg