Nuclear thermal coupling computing method for nuclear reactor

Abstract

The invention discloses a nuclear thermal coupling computing method for a nuclear reactor. A mathematical model for nuclear thermal coupling computation is constructed, and a fixed point equation of power distribution is solved, so that nuclear thermal coupling power distribution is obtained. The computing method comprises the following specific ways: initial power distribution is set to be average distribution; an iterated function containing a relaxing factor lambda is constructed, the power distribution is iterated twice successively, the power change rate of the successively iterated function is computed, and if the power change rate of N grids is smaller than 1, the power distribution can be solved in a successive iteration method; and otherwise, the power distribution is solved with a partially iterated function. A computational formula of a maximum relaxing factor in a partial iteration method is given, and sinusoidal distribution is recommended to be used as the initial power distribution. The nuclear thermal coupling computing method provides convenience for the design and analysis of the reactor.

Description

technical field [0001] The invention relates to the field of nuclear engineering, and more specifically, relates to a calculation method for nuclear-thermal coupling of nuclear reactors; specifically, it includes a mathematical model for nuclear-thermal coupling calculation of nuclear reactors, a convergence judgment and a solution method. Background technique [0002] In the context of increasing human demand for energy and increasing scarcity of traditional fossil energy, nuclear power generation has received more and more attention in recent years. However, currently the most widely used reactor types, such as pressurized water reactors and boiling water reactors, are limited by their low heat conversion efficiency and fuel utilization, as well as the risk of nuclear accidents and nuclear proliferation, so it is necessary to research and design more advanced and safe A new type of nuclear energy system, namely the fourth generation nuclear energy system. The fourth-gener...

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Problems solved by technology

At present, when conducting nuclear thermal coupling calculations at home and abroad, the appropriate iterative method is mainly selected based on experience or through multiple attempts. The mathematical model of nuclear thermal coupling of nuclear reactors, the determination method of iterative convergence, and nuclear thermal coupling calculations for different reactor types have not yet been proposed. The common solution method at the time brings inconvenience to the design and analysis of the reactor

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