Smirnov A.M., Morozov A.V.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Since passive systems provide a high level of safety in Russian NPP projects, they have a rather high cost compared to projects developed in other countries. Actual reduction in the cost of these systems. The paper proposes a method for optimizing the passive heat removal system of WWER reactor, consisting in reducing the area of air heat exchangers and simultaneously using water spray to intensify the heat transfer process in order to return the power characteristics to their original values. A calculated evaluation of the efficiency of proposed method of optimizing is also performed for the case of reducing the area of air heat exchangers for 20%, based on the results of which the values of the operational parameters of the optimized system are calculated. In addition, the main parameters affecting the efficiency of using water spray are determined, and the nature of their influence in relation to the optimized passive heat removal system of WWER reactor is analyzed. The results of the performed computational assessment indicate that this optimization method can be used in the development of new projects with WWER-type reactors. However, in order to refine the parameters of the optimized system, it is necessary to carry out computational and experimental studies of heat transfer processes with aerosol supply to the working section simulating the surface of the PHRS heat exchanger.
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