scholarly journals Heat transfer intensification in emergency cooling heat exchanger of nuclear power plant using air-water mist flow

2019 ◽  
Vol 2019 (3) ◽  
pp. 16-27
Author(s):  
Akram Hamzah Abed ◽  
Sergej Ewgen’evich Shcheklein ◽  
Valery Maksimovich Pakhaluev
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Water Mist ◽  
Heat Transfer Intensification ◽  
Mist Flow

scholarly journals Optimization of heat transfer processes in the circuit of a nuclear power plant in order to increase it

2021 ◽  
Vol 3 (134) ◽  
pp. 79-86
Author(s):  
Svetlana Shvachich ◽  
Vladimir Bulychev ◽  
Kateryna Ternova
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Heat Exchangers ◽  
Nuclear Power ◽  
Nuclear Energy ◽  
Secondary Circuit ◽  
Transfer Processes ◽  
Heat Carriers

The urgency of the work is due to the depletion of traditional fuel reserves and increasing the load on the biosphere because of emissions from burning coal, oil and gas. The solution of these problems are the development of nuclear energy. The advantages of nuclear energy are analyzed, namely: high calorific value of nuclear fuel, better economic indicators, less environmental pollution. The purpose of this work is to optimize the heat transfer processes in the secondary circuit of a nuclear power plant. It is proposed to take the second circuit of the third power unit of the Rivne nuclear power plant as the object of research. The need for knowledge of heat transfer processes and hydrodynamics is determined by the fact that nuclear reactors are energy-intensive thermal machines, in which these processes are manifested in a rather complex form. Therefore, measures to optimize heat transfer processes in the thermal circuit of the second circuit of the NPP in order to increase energy performance are considered. In order to remove from the system the hardness salts that settle on the walls of the equipment and impair the heat transfer processes, a reagent has been selected to bind the hardness salts. he addition of the PuroTech113 reagent to the working circuit of the secondary circuit made it possible to free the system from the deposition of hardness salts in it, as this reagent "binds" free calcium and magnesium ions. In turn, scale is no longer deposited on the walls of the heat exchange equipment, which allows to fully transferring the required amount of heat. Recalculation of the thermal balance showed that the efficiency of the unit is increased by 3%.The efficiency coefficient of the heat exchanger was chosen as the criterion of optimality. The efficiency of the heat exchanger in the general case is a function of the mode parameters, the scheme of mutual movement of heat carriers and features of hydrodynamics and heat transfer of real heat exchangers. The problem of optimizing the movement of heat carriers in intermediate heat exchangers is solved in paper.

Research on the Inspection Strategy Change Based on Risk-Informed Method in Nuclear Power Plant

2017 ◽  
Author(s):  
Ye Shuixiang ◽  
Li Qiongzhe ◽  
Xi Haiying
Keyword(s):  
Heat Exchanger ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Power Plants ◽  
System Component ◽  
Informed Decision Making ◽  
Inspection Strategy ◽  
Strategy Change ◽  
Generation Activity

In order to gain more operational benefits, many nuclear power plants will intend to optimize the generation activity to increase generating capability factor, such as, shortening the refueling schedule by optimize the inspection strategy of relevant to SSCs (structure, system, component) during reactor shutdown. Therefore, this paper will introduce the research on the inspection strategy change based on risk-informed method, and provide detailed discussion on change of the RHR heat exchanger inspection strategy by employed the above mentioned method in one nuclear power plant. The result shows that the optimization of RHR heat exchanger inspection strategy meets all the consideration of the principles in risk-informed decision-making required by RG 1.174 and the optimization proposal is acceptable.

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