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الثلاثاء، 25 مارس، 2014

Nuclear Reactor Core Monitoring and Optimization

Title            :   Nuclear Reactor Core Monitoring and Optimization
Author         :  Mohamed Taha Ali Mahady
Collection   :  M.Sc. Nuclear 
Abstract:  
During the nuclear reactor operation, the control rod position, the boron concentration, the moderator density and the coolant temperature are among the important variable parameters whose values have to be considered by the operator in order to make the right decision. Any changes in these parameters in addition to the other reactor ones affect the key parameters, namely, the radial form factor, the average discharge irradiation, and the multiplication factor. These key parameters in turn have to be optimized in order to achieve the reactor objective function which is a function normally derived from the key parameters and able to achieve the safety and operation principles. In this work, artificial neural network method has been applied at the beginning of the fuel cycle of the benchmark7 PWR 2772-MWth operating at 100% full power to predictthe control rod positions. Training of the neural network has been based on the outputs of Triton code which is a multi-group diffusion depletion code in three dimensions, with criticality searches, written in FORTRAN. Results show that control rod positions predicted by neutral network get closer to the actual positions whenever the control rod is more inserted inside the core. Triton code was also used to obtain the effective multiplication factor (keff) depending on control rod position, boron concentration, moderator density, and coolant temperature. The WEKA(Waikato Environment for Knowledge Analysis) data mining soft ware made use of these data to for mulatea mathematical expression describing the relationship between the key parameter- and the mentioned variable parameters. Finally the genetic algorithms were utilized to optimize the value of the effective <multiplication factor(keff).Criticality was found to be achieved when the control rod was 25% inserted with a boron concentration equal to 1200 ppm and moderator density equal to 0.7125 gm/crrr’

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