Process approach to diagnostics of process media of oil-filled equipment of a nuclear power plant

This article is a review. This study considers: the main states of technological media during their operation in the oil-filled equipment of power enterprises, in particular in the units of a nuclear power plant; a process approach to diagnosing the technological media of oil-filled equipment of a nuclear power plant. The largest volume of power oils used in the oil-filled equipment of a nuclear power plant belongs to transformer and turbine oils. Gaseous, liquid, and solid substances (hydrogen, water, adsorbents, etc.) are used as process media in oil-filled equipment in Ukraine, the condition of which affects the technical condition of oil-filled equipment. Continuous improvement of the process approach to diagnosing the process media of oil-filled equipment of a nuclear power plant is relevant. The analysis of researches and publications on the determination of the condition of technological media of oil-filled equipment of a nuclear power plant has shown that the process approach to the diagnosis of various technological media of thermomechanical oil-filled equipment of a nuclear power plant is currently not fully applied. This is due to the large number of physical and chemical indicators of the quality of these process media, operational and technical conditions of the oil-filled equipment or stages of its life cycle. All this requires expansion of the requirements for diagnosing process media to determine and predict their condition; continuous improvement of the process approach to diagnosing process media of oil-filled equipment in a nuclear power plant. The aim of the article is to improve the process approach to diagnosing gaseous, liquid, solid process media during their operation in oil-filled equipment of Ukrainian nuclear power plants based on the results of determining the quality indicators of these process media in a testing laboratory, which will increase the reliability of such diagnostics, taking into account the states of process media in oil-filled equipment. Based on the analysis of literature sources, modern methods of diagnosing technological media are considered. The paper solves the main tasks related to: diagnostics of technological gaseous, liquid, and solid media during their technical operation in power equipment based on the results of determining the quality indicators of these technological media; improvement of the schematic diagram of distribution of technological media in a TVV turbogenerator with hydrogen cooling of the rotor and stator and water cooling of the stator winding. On the basis of the process approach, possible states of technological media of oil-filled equipment of a nuclear power plant are identified when determining the quality indicators of these technological media. At the same time, it is necessary to take into account the operational and technical conditions and life cycle stages of such equipment. When providing recommendations on the application of a process approach to diagnosing process media during their technical operation in oil-filled equipment of a nuclear power plant, it is determined that: the system for diagnosing process media includes a set of elements: objects of diagnosis (process media) and means, rules, and performers of diagnosis; it is necessary to apply international standards that ensure the functioning of the elements of the system for diagnosing the states of process media in oil-filled equipment. The presented results can be used for a reasonable choice or development of new promising methods for diagnosing technological media during their operation in oil-filled equipment of a nuclear power plant to increase the reliability of technical diagnostics of this equipment.