An Adaptive Online Method for Generating Subgroup Parameters

Abstract

An adaptive online method for generating subgroup parameters. 1. For a given number of states, select the corresponding number of background section points, and interpolate to obtain the temperature of the specific problem and the section under the corresponding background section points. Combine the subgroup intermediate section and subgroup probability; 2. Select at least 20 background section points, and use Pad approximation to fit the subgroup subsection; 3. Calculate the subgroup parameters of 2-6 states separately, according to the stability criterion and the fitting error criterion to select the optimal subgroup parameters; in the method of the present invention, the Pad approximation is used to fit the subgroup parameters, the calculation speed is fast, and the purpose of generating the subgroup parameters online can be achieved; According to the selection of data and fitting error criterion, the optimal subgroup parameters can be adaptively selected; the subgroup parameters are calculated according to the temperature of the specific problem, and the calculation time will not increase due to the increase of the number of states.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor core design and safety, in particular to an adaptive on-line method for generating subgroup parameters. Background technique [0002] Resonance calculation provides effective self-shielding section for subsequent calculation, which is an important part of deterministic calculation method. The subgroup resonance calculation method has higher calculation accuracy than the traditional equivalent theory, so it has been widely studied and applied in recent years. This method defines subgroups by dividing the cross section horizontally, and uses the subgroup parameters to describe the violent fluctuation of the nuclear reaction cross section. The continuous energy transport equation is integrated over the subgroup to obtain the subgroup transport equation. Taking advantage of the formal consistency of subgroup transport equations and multigroup transport equations, resonance calculations are t...

AI Technical Summary

Problems solved by technology

The first problem is that the efficiency of fitting calculation is low, so it must be made offline, which increases the storage of the database and makes the making of the database more complicated.

The second problem is that for different resonance energy groups, the intensity of resonance is different, so the optimal number of states that can describe the formant is also different, and the number of states needs to be adjusted continuously during the fitting process

The third problem is that subgroup parameters made offline lead to an increase in resonance calculation time

This leads to an increase in resonance calculation time

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