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Reactor core power distribution online reconstruction method and system based on local nonlinear correction

A core power distribution and non-linear correction technology, applied in the field of nuclear reactor core operation and safety, can solve the problems of high dimension covariance matrix of physical field, data assimilation method not capable of optimizing detector distribution, increasing modeling uncertainty and Computational costs etc.

Active Publication Date: 2021-09-21
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latest research shows that the data assimilation method has the potential to utilize the measurement information of multi-source heterogeneous detectors, that is, it can comprehensively utilize detector information from different sources, different precisions, and different distributions to improve the reconstruction accuracy, but the data assimilation method itself does not Ability to optimize detector distribution
In addition, for high-dimensional physical fields, data assimilation needs to model the high-dimensional covariance matrix of the physical field, which greatly increases the modeling uncertainty and computational cost

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  • Reactor core power distribution online reconstruction method and system based on local nonlinear correction
  • Reactor core power distribution online reconstruction method and system based on local nonlinear correction
  • Reactor core power distribution online reconstruction method and system based on local nonlinear correction

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Embodiment 1

[0099] Such as figure 1 As shown, the present invention relates to the technical field of nuclear reactor core operation and safety, specifically an advanced core measurement system (on-line monitoring system for nuclear reactor power distribution) based on detector measurement information for online monitoring of core power distribution, especially related to the method based on local On-line reconstruction technology of reactor core power distribution based on nonlinear correction data assimilation technology (abbreviated as LNC).

[0100] The present invention is based on an online reconfiguration method of core power distribution based on local nonlinear correction, and the method includes:

[0101] According to the discretization of the three-dimensional grid of the reactor core, the local nonlinear correction coefficient matrix A is calculated;

[0102] According to the local nonlinear correction coefficient matrix A and the given background physical field F b , determ...

Embodiment 2

[0150] Such as Figure 2 to Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment is aimed at the Hualong No. 1 (HPR1000) reactor core (see figure 2 ) power is modeled, considering two main factors affecting the power distribution:

[0151] -Bu: burnup, from the beginning of life (BOC) to the end of life (EOC), in MWd / tU;

[0152] -St: R stick insertion step, from 0 to 220 steps.

[0153] The power level is 100% FP, the other control rods are all lifted, and the boron concentration is the critical boron concentration. Therefore the parameters in Using SCIENCE / CORCA-3D, get the power distribution in each case in the parameter empty space, and get the power distribution set image 3 The axial power distribution of the #F06 assembly is given as a function of the R-rod insertion depth.

[0154] This example examines several typical physical field reconstruction methods:

[0155] (1) The inventive method (LNC);

[0156] (2...

Embodiment 3

[0164] Such as Figure 1 to Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides an online reconfiguration system for core power distribution based on local nonlinear correction, and the system supports the local nonlinear correction based on local nonlinear An online reconfiguration method for linearly corrected core power distribution, the system includes:

[0165] The acquisition unit is used to acquire the discrete situation of the three-dimensional grid of the reactor core;

[0166] The correction coefficient calculation unit is used to calculate the local nonlinear correction coefficient matrix A according to the discretization of the three-dimensional grid of the reactor core;

[0167] The first processing unit is used to correct the coefficient matrix A according to the local nonlinearity and the given background physical field F b , determine the physical field F to be reconstructed a and the background physics...

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Abstract

The invention discloses a reactor core power distribution online reconstruction method and system based on local nonlinear correction, and the method comprises the steps: calculating a local nonlinear correction coefficient matrix A according to the discrete condition of a reactor core three-dimensional grid; according to the local nonlinear correction coefficient matrix A and a given background physical field Fb, determining a local nonlinear correction difference relationship between the physical field Fa to be reconstructed and the background physical field Fb; constructing a detector response matrix H according to the arrangement condition of the detectors; according to the detector response matrix H, establishing a difference relationship between a theoretical measurement value of the physical field to be reconstructed and a real detector measurement value; establishing a cost equation according to the data assimilation equation, and obtaining the physical field Fa to be reconstructed by solving the minimum cost equation. The method is simple to operate, the local nonlinear correction coefficient matrix A does not depend on a background physical field, and the online reconstruction efficiency of the physical field is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor core operation and safety, in particular to a method and system for on-line reconfiguration of core power distribution based on local nonlinear correction. Background technique [0002] On-line monitoring of nuclear reactor core power distribution is of great significance to ensure the safety of the reactor core and improve the economic benefits of nuclear power plants. But the core power distribution is not a direct monitoring quantity, but the core power distribution is measured indirectly through the measurement of the neutron flux density. In order to measure the neutron flux density of the core in real time, neutron detectors are installed inside or outside the reactor, but these neutron detectors are only arranged at specific positions and the number is limited, so to achieve spatially continuous power distribution For real-time monitoring, it is very necessary to study the online r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/00G21C17/10G21D3/12
CPCG21C17/001G21D3/12G21C17/10Y02E30/00Y02E30/30
Inventor 龚禾林李庆于颖锐陈长赵文博彭星杰刘同先娄磊巨海涛吉文浩
Owner NUCLEAR POWER INSTITUTE OF CHINA