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Simulation Method for Nuclear Power System and Application

Liao Zhongyue; Li Tiejun; Liu Changxin(Nuclear Power Institue of China, Chengdu, 610041)  
The stiffness confinement method (SCM) for solving the reactor neutron kinetic equations is described. The main characteristic of the method is to define an auxiliary function w(t) to decouple the stiffness from the differential equations for precursors and confine it to the prompt neutronics equation which can be analytically solved. As a result, the time step increment can be greatly increased and much computing time can be saved, as compared to other conventional methods. The results compared against the exact ones are given under several reactivity disturbance transients. The method is used in the nuclear steam supply system (NSSS) transient calculation of Qinshan phase Ⅱ nuclear power plant. The results are satisfactory. It is occupied only about 80s for a 560s process of Qinshan phase Ⅱ nuclear reactor power control system simulation. It makes it possible to accomplish NSSS real-time even fast-time simulation in a microcomputer.
【CateGory Index】: TL327
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