Real-time Simulation Program Of Plate-type Fuel Reactor Core Physics

Compared with the conventional large-scale and medium-scale nuclear reactors, the integral pressurized water reactors have advantages on simple system, high safety, low cost,wide uses and flexible constructive region. So many Nuclear powers pay much attention to it and carry out a rat race. Compared with rod-shaped fuel elements, plate-shaped fuel elements have advantage on economy and safety because of its more power density and more stability of fuel elements. Because plate-shaped fuel elements have its special features and there's limited experience on commercial generating electricity, it is necessary to develop plate-shaped fuel small reactor's real-time simulation code.Firstly, based on two dimensional neutron and gamma transport code HELIOS-1.11 for lattice burn-up calculation and three dimensional core physics code REMARK for real-time simulation .Plate-shaped fuel small reactor's core physics analytical code is established for IAEA-10 reactor in this dissertation. During establishing the code, HELIOS-1.11 is used to analyze standard fuel elements in detail and a best calculation scheme of least cost. During modifying the REMARK code, two-neutron energy groups with six groups of delayed neutrons as the neutron dynamic mathematic model and improved quasistatic approach are chosen to solve the function in this dissertation. At the same time, a subroutine is used to adjust reactor power and search the critical control rod position automatically. Some core physics parameters are calculated and verified, the result indicates that it is appropriate to apply the code to the calculation of plate-shaped fuel small reactor.Secondly, based on established code and Chinese advanced research reactor (CARR),this dissertation establishes real-time simulation code of CARR. Burnup?fuel temperature?moderator temperature and some other parameters are taken into consideration to calculate cross-sections and fitting method is discussed to generate cross-sections in the code. Some stable core physics parameters are calculated and compared with the reference, the result indicates that errors between simulation results and the real data are acceptable and calculating speed and accuracy of the code meets the demands.Finally, the core real-time 3D physical simulation code of CARR is coupled with the thermal-hydraulic simulation code THEATRe of CARR on the simulation platform SimExec.Results of coupling code are analyzed and some transient work conditions are simulated. The results demonstrate that the coupling code is successful.