Authors & Affiliations
Niyazov S.-A.S., Ivanov K.D., Lavrova O.V.
A.I. Leypunsky Institute for Physics and Power, Obninsk, Russia
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.
metal components, structural steel, heavy liquid metal coolant, oxidation, oxide film, magnetite, circuit, diffusion, mass transfer, oxygen, cover gas, nuclear power plants
1. Ivanov K.D., Lavrova O.V., Salaev S.V. Use of evaluation method of metal component diffusion yield from steels developed for study of steel corrosion resistance in heavy coolants. Proceeding of Conference “Thermohydraulic aspects of NPP safety of fast neutron reactors”, p. 117, 2005.
2. OECD/NEA Nuclear Science Committee working Party on Scientific Issues of the Fuel Cycle Working Group on Lead-bismuth Eutectic “Handbook on Lead-bismuth Eutectic”, pp.238-270, 2007.
3. Ivanov K.D., Lavrova O.V., Yudintsev P.A., Niyazov S.-A.S. Impurity sources in Pb and Pb-Bi coolants. Report at interbranch workshop “Heavy liquid metal coolants in fast reactors (Thermal Physics-2010)”, 2010.