Method for designing axial travelling wave reactor starting area

Abstract

The invention discloses a method for designing an axial travelling wave reactor starting area. The method comprises the following steps: (a) setting the length of the reactor starting area; (b) axially dividing the reactor starting area; and (c) setting the nuclear density of each axial section of the reactor starting area. According to the reactor starting area designed by the method, after an axial travelling wave reactor stably runs, fuel compositions in each axial section of a main combustion area are quite complicated and comprise fissionable nuclide, fissile nuclide and fission products. Particularly, the fission products affect reactor core reactivity and power distribution greatly due to the difference of kinds and content of the fission products. The four fuels are adopted, so that the combustion condition can be simulated, and the whole power can be regulated by adjusting the content of each composition.

Description

technical field [0001] The invention relates to the start-up area structure of an axial traveling wave reactor, in particular to a design method for the start-up area of ​​an axial traveling wave reactor. Background technique [0002] The fundamental starting point of the axial traveling wave reactor is that the fuel consumption of the reactor advances from one end to the other at a certain speed in the axial direction, and at any moment in the lifetime of the reactor, the reactivity and axial power distribution shape of the reactor are basically unchanged. During the operation of the axial traveling wave reactor, the core is divided into three areas in the axial direction: the spent fuel area, the main combustion area, and the fresh fuel area. The main combustion area is enriched fuel, the neutron fluence rate is much higher than the other two areas, and it is the main energy source of the core; the new fuel area can be loaded with natural uranium, depleted uranium, or spen...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a design method applied to the start-up area of ​​an axial traveling wave reactor, which solves the current problem that the core reactivity fluctuates greatly during the whole life, and achieves that the core reactivity is basically unchanged during the whole life. Change, important physical parameters such as neutron fluence rate distribution, power distribution, nuclide distribution and other shapes do not change but propagate in the axial direction at a certain speed

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