A Method of Generating Characteristic Lines Online

Abstract

The invention discloses a method for generating a characteristic line online. The method comprises the following steps of 1, determining the position of a starting point of characteristic line scanning according to the argument and radial width, input by a user, of the characteristic line; 2, determining the position where the characteristic line scanning is performed at present; 3, obtaining characteristic line information; 4, calculating a scalar flux of a storage coarse net by MOC; 5, calculating a distance from a nearest surface; and 6, determining a lattice cell which the characteristic line is about to arrive at. According to the method, repeated units do not need to be used; the characteristic line is generated in the characteristic line scanning process, namely, the characteristic line is generated while being scanned; and the geometry of a reactor core is not limited completely, so that the application range of a conventional characteristic line method is greatly expanded.

Description

technical field [0001] The invention relates to the field of nuclear reactor core numerical calculations, in particular to a method for generating characteristic lines online and applying the characteristic line information to the calculation of the core characteristic lines. Background technique [0002] The neutron transport equation, also known as the Boltzmann transport equation, describes the conservation relationship of neutrons in motion, as shown in formula (1): [0003] [0004] In the formula: [0005] ψ—neutron angular flux density; [0006] r—space position vector of neutron; [0007] Ω——Angle vector of neutron motion; [0008] E - neutron energy; [0009] t - time; [0010] v - the speed of neutron motion; [0011] - mathematical operators, Where i, j, k are the direction vectors in the x, y, and z directions respectively; [0012] Σ t — total cross-section of the reaction; [0013] Q—neutron source term; [0014] When discussing the steady stat...

AI Technical Summary

Problems solved by technology

So it is less adaptable to geometry

Specifically, for a component or core composed of geometrically identical rectangular cells, the modular feature line method can select the cell as the module for generating feature lines, because in this case, the cell is the smallest repeating unit ; but for the common hexagonal component problem in the fourth-generation stack type, since the hexagonal component cannot be completely filled by the hexagonal cell, only the component can be selected to generate the modular characteristic line

For the two types of problems of rectangle and hexagon, their feature line generation modules cannot be used universally

This greatly limits the adaptability of the feature line method to geometry

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