FIELD: nuclear power engineering; studying temperature conditions of nuclear-reactor cores. SUBSTANCE: temperature sensor is displaced on fuel assembly model from source downwards along coolant flow up to sensor response zone boundary; this distance is measured, and in order to determine effect of temperature on interval beyond sensor response zone, axial and cross coolant flowrates in element-to-element channel splitting cells are measured on response zone boundary along with temperature difference of fuel element model surface splitting area and coolant temperature at fuel assembly inlet. Corrected difference in temperature of element model surface splitting areas and coolant temperature at assembly input due to effect of source in layer i-1 are determined for layers starting from first layer beyond response zone (i = n+1). Correction is made by using equation of balance, therefore corrected temperature differences are more accurate in fuel assemblies with heavily irregular structure or energy release density. After that, desired temperatures of fuel elements are found by solving relevant set of equations for layers starting from layer i = n+1. EFFECT: improved accuracy of temperature measurement in fuel assemblies with heavily irregular structure or energy release density. 5 dwg
