Authors & Affiliations
Niyazov S.-A.S., Ivanov K.D., Lavrova O.V.
A.I. Leypunsky Institute for Physics and Power, Obninsk, Russia
Abstract
Substantiation of the efficiency, lifetime and dimensions of coolant technology equipment includes numerical evaluation of the results of coolant interaction with structural steels of the primary circuit. This interaction determines, on the one hand, both local and integral oxygen consumption, which is important for the substantiation of design of the device for oxygen supply to the coolant, and, on the other hand, the ingress of metal impurities into the coolant. It is known that the excessive accumulation of metal impurities in the coolant, which are mainly oxides under normal operating conditions, may cause formation of various depositions on heat transfer wall surfaces and, hence, deterioration of heat transfer characteristics of the equipment. Besides, the impurities present in the circuit may cause partial or even total coolant flow blockage. Solid particles formed in the coolant on the basis of the oxides of the structural steel components may reach coolant-gas interface and penetrate to the NPP gas system resulting in its contamination, dose rates increase and abnormal operation of the equipment.
Key words
metal components, structural steel, heavy liquid metal coolant, oxidation, oxide film, magnetite, circuit, diffusion, mass transfer, oxygen, cover gas, nuclear power plants
UDC 621.039.5
Problems of Atomic Science and Technology. Series: Nuclear Constants, issue 2:10, 2015