Abstract
The possibility of a comprehensive assessment of steam generators efficiency at nuclear power plants with water-water reactors, based on the indicator of OEE (overall equipment effectiveness) is considered. It is proposed to consider efficiency as the probability of functioning from the standpoint of availability, performance and product quality.The aim of the work is to evaluate the possibility of using the OEE indicator to analyze the efficiency of NPP steam generators in complex conditions: reactor − steam generator − turbine. Achieving this goal will provide a comprehensive indicator of monitoring the efficiency of steam generating systems and have a tool for systematic monitoring of steam generators. To assess the organizational and environmental efficiency of the organizational structure, individual, group and integrated indicators are proposed, which reflect the share or decrease of the absolute indicator in the system compared to the baseline. The study is based on the analysis of long-term performance of units with steam generators PG-1000, which are comparable. It is shown that the main element of the steam generation system, which determines its efficiency, is the heat generating source. The contribution to the efficiency of all aspects of operation is estimated. It is shown that the efficiency index of OEE allows to characterize the efficiency of steam generators operation at nuclear power plants with water-water reactors, and can be used to monitor and control the process of their operation. In result of research, it is defined that steam generator efficiency increases in process of achievement of the maximum value of its productivity.
Highlights
Nuclear power plants use a typical scheme for converting nuclear energy into electricity
It is proposed to consider efficiency as the probability of functioning from the standpoint of availability, performance and product quality.The aim of the work is to evaluate the possibility of using the OEE indicator to analyze the efficiency of NPP steam generators in complex conditions: reactor − steam generator − turbine
Nuclear reactions heat a water coolant under high pressure, which is pumped from the reactor through a steam generator, where it gives part of the heat to the secondary circuit and returns to the reactor
Summary
Nuclear power plants use a typical scheme for converting nuclear energy into electricity. Nuclear reactions heat a water coolant under high pressure, which is pumped from the reactor through a steam generator, where it gives part of the heat to the secondary circuit and returns to the reactor. The water of the secondary circuit is under less pressure, so it boils, forming steam for the turbine. Steam generators are used for two- and three-circuit NPPs. Steam generators, along with turbine condensers and intermediate heat exchangers (with a three-circuit circuit), are the main heat exchangers of nuclear power plants, the characteristics of which significantly affect the efficiency and economic performance. The steam generator at the NPP provides heat exchange between the first and second circuits, as well as steam production for the turbine
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