Application of full-scale strain studies results for determining the equipment internal surfaces damages during rapid changes of coolant temperature

Abstract

Abstract The method for metal damage determining for the inner surfaces of power equipment exposed to the coolant with a rapidly changing temperature is considered. Due to the impossibility of deformations and temperatures direct measurement for the inner surface, a calculation-experimental algorithm is proposed based on processing the results of strain measurements obtained for the outer surface in geometrically homogeneous and non-uniform zones of the structure. To qualify the functions for changing stresses and temperatures on the inner surface, in this paper, it is proposed to use the algorithm based on solving inverse problems of mechanics. The recovered functions of the temperature stresses temporal variations for the interface zone of the pipeline and the nuclear power plant body are presented.