P. M. Kuznietsov1, 2, O. O. Biedunkova1
1 National University of Water and Environmental Engineering, 11, Soborna st., Rivne, 33028, Ukraine
2 SS Rivne NPP, 1, Promyslova st., 34400, Varash, Ukraine
DOI: doi.org/10.31717/2311-8253.23.3.6
Abstract
Regardless of the type of cooling cycle, all nuclear power plants (NPPs) have a cooling water discharge with residual heat energy. Significant volumes of water are circulated in the cooling system of an NPP, which is withdrawn and discharged into a natural water body, thus transferring heat from the power plant to the water body. Changes in the content and balance of biogenic substances in surface waters under the influence of water discharges from an NPP can be considered as important indicators of water and environmental reactions to heat emissions from an NPP. The study aims to determine the dynamics of changes in the content of biogenic elements for the coexisting forms of nitrogen (N), phosphorus (P), and carbon (C) with the establishment of variability factors and correlations between their forms in the water of the Styr River, which is in the zone of water discharges influence from the Rivne Nuclear Power Plant (Rivne NPP). According to the results of the study, it was determined that the content of P (orthophosphate ions РО4 3-), C (biochemical oxygen demand for 5 days BOD5 and chemical oxygen demand COD) and N (ammonium nitrogen N-NH3 , nitrate ions NO3-) in the water of the Styr River in the zone of influence of water discharges from the Rivne NPP has seasonal dynamics. The correlation of the balance content of nutrients in the water of the Styr River before water intake and after discharge by the Rivne NPP was estimated. Regression statistical dependencies were established, which allow predicting the content of nutrient forms depending on the temperature by environmental and technical factors of temperature influence. In general, the research results indicate that there is no negative impact of the Rivne NPP water discharges on the balance of nutrients, and therefore no manifestation of the Styr River water-ecological reactions to the Rivne NPP heat release.
Keywords: nuclear power plant, temperature influence, discharges, biogenic elements
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