Improvement of methods for controlling power oil of cooling tower recycling water supply units at Rivne nuclear power plant

Abstract

The relevance of the study is conditioned upon the fact that at nuclear power plants, water pumping units using energy oils are operated in the heat exchange equipment of power units. The diagnostic criteria of oils allow identifying defects in the operation of technological equipment. The purpose of the work – to increase the reliability of the operation of oil-filled power equipment by improving the monitoring of the physical and chemical properties of power oil TP-30. The main attention is devoted to increasing the reliability of the operation of oil-filled power equipment by improving the monitoring of the physical and chemical properties of TP-30 power oil. Experimental studies were conducted by chromatography, and gas and liquid extraction using appropriate laboratory equipment. When exploring the content of chemical elements in the segments of the thrust bearing of the cooling tower pumping unit, which is based on Sn, an increase in the content of copper Cu and Sb was observed, which exceeded the standard by an average of 1.2 and 1.1 times, respectively. Most of the analysed physical indicators of oil quality (water content, kinematic viscosity, flash point, acid number) did not demonstrate deviations from the standard values. Only an increase in the mass fraction of mechanical impurities by 0.0026% relative to the standard was noted during the incoming inspection of TP-30 oil. The results of the operational control of the oil in terms of a set of physical indicators fully complied with the established technological standards. The highest content of soluble gases in the oil (0.56% by volume) was recorded for propylene (C3 H6 ). It is recommended to use the relative content of soluble gases in Tp-30 oil to C3 H6 when identifying degradation processes. The absence of residuals of circulating power oil TP-30 in the surface waters of the Styr River during the operational event was established. Generalisations have been generalised about the necessity of expanding the diagnostic criteria for the quality of TP-30 oil, in particular, expanding the list of its physical indicators. In practical terms, the results obtained can be useful for monitoring the quality of other brands of petroleum oils in the systems of turbine units of nuclear power plants, which is important in terms of the safe operation of heat exchange equipment

Monitoring of Phosphorus Compounds in the Influence Zone Affected by Nuclear Power Plant Water Discharge in the Styr River (Western Ukraine): Case Study

“…The CCS cooling water concentration cycles are controlled by blowdown, which is sent to a reservoir; water losses due to evaporation and blowdown are replenished with additional water taken from the reservoir (Figure 1). Corrective reagents are used for water treatment, in particular phosphonate treatment with HEDP implemented at the Rivne NPP [33].…”

“…Atomic energy is a safe and stable source of electricity production. For the operation of an atomic power plant (NPP), it is necessary to ensure cooling of its elements and systems, which are powered by large amounts of water that then discharge into a water body [6,7]. In the cooling systems of nuclear power plants, heating, evaporation, and concentration of the cooling water components occur [8,9].…”

“…Particularly high concentrations were recorded in some rivers of the eastern region of Ukraine, reaching [32]. Due to natural mechanisms of phosphonate elimination, the prolonged release of bioavailable phosphate from phosphonates into natural waters is ensured, thus not excluding eutrophication processes [33]. The regulation of phosphorus discharge into wastewater in Ukraine is carried out in accordance with [34], while in EU countries, phosphorus content is regulated according to [35].…”

4th International Conference on Sustainable Futures: Environmental, Technological, Social and Economic Matters

“…The first sub-section focuses on radiation pollution caused by war and nuclear power plants. The talks in this sub-section present mathematical tools for restoring the surface distribution of radiation pollution based on remote measurement data [252,253], a conceptual scheme for creating environmentally friendly Gd-containing neutron-absorbing nanocomposites [254], a factor-criterion model for selecting the optimal option for transforming the "Shelter" object into an environmentally safe system [255], and the formation of the carbonate system of circulating cooling water of the Rivne NPP and its influence on the surface waters pH levels of the Styr River [256]. These talks provide novel approaches and techniques for reducing the radiation exposure and contamination of humans and the environment.…”

Evaluating the impact of dispersed particles in the water of a power plant recirculating cooling system on the discharge of suspended solids into a natural water body

“…Open recirculating cooling systems (RCS) of power plants are necessary for heat removal [1]; thermal loads from cooling water are released into the atmosphere through cooling towers, and return water is discharged into reservoirs [2]. The reliability of RCS from the point of view of the chemical aspect is related to the probability that the system will not fail due to chemical processes [3], the manifestations of operational failures are symptoms of the main influencing factors: chemical composition, temperature, pressure [4].…”