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Online Reconfiguration Method and System of Core Power Distribution 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 problem of high dimension covariance matrix of physical field, increase modeling uncertainty and calculation cost, and data assimilation method does not have optimal detection device distribution etc.

Active Publication Date: 2022-04-01
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

Method used

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  • Online Reconfiguration Method and System of Core Power Distribution Based on Local Nonlinear Correction
  • Online Reconfiguration Method and System of Core Power Distribution Based on Local Nonlinear Correction
  • Online Reconfiguration Method and System of Core Power Distribution Based on Local Nonlinear Correction

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Embodiment 1

[0099] Such as figure 1 As shown, the present invention relates to nuclear reactor core operation and safety technology, and the specific advanced binding measurement system (nuclear reactor power distribution online monitoring system) is based on the method of online monitoring of the core power distribution based on detector measurement information, in particular to local Nonlinear Correction Data Assimilation Technique Reactive Heap Head Power Distribution Online Reflatability Technology (A referred to as LNC).

[0100] The present invention is based on a local nonlinear correction of the core power distribution online reconstruction method, including:

[0101] According to the three-dimensional grid discrete, local nonlinear correction coefficient matrix A;

[0102] According to the local nonlinear correction coefficient matrix A and a given background physical field F b Determine the retroactive physical field F a Background Physical Field F b Difference relationship between ...

Embodiment 2

[0150] Such as Figures 2 to 6 As shown, the difference from the first embodiment is that the present embodiment is directed to Hualong No. 1 (HPR1000) reactive pile core (see figure 2 ) The power is modeled, considering two main factors affecting power distribution:

[0151] -Bu: fuel consumption, from the beginning of the life (BOC) to the end (EOC), unit MWD / TU;

[0152] -St: r stick plugged in, from 0 to 220 steps.

[0153] The power level is 100% FP, and the other control rods are full, the boron concentration is a critical boron concentration. Therefore, the parameter in With science / corca-3d, the power distribution in each case in the parameter space space is obtained, and the power distribution collection is obtained. image 3 The axial power distribution of the # f06 component is given by the power distribution of the R rod insertion depth.

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

[0155] (1) Method (LNC) of the presen...

Embodiment 3

[0164] Such as Figure 1 to 6 As shown, the difference from the first embodiment is that the present embodiment provides a local non-linear correction of the core power distribution of the core power distribution, which supports the local non-partial non- Linear correction core power distribution online reconstruction method, including:

[0165] Get a unit for obtaining a three-dimensional grid discrete condition of the reactor core;

[0166] The correction coefficient calculation unit is used to calculate the partial nonlinear correction coefficient matrix A according to the discrete condition of the reactor core.

[0167] The first processing unit is configured to generate Field F according to the local nonlinear correction coefficient matrix A and a given background. b Determine the retroactive physical field F a Background Physical Field F b Difference relationship between local nonlinear correction;

[0168] The second processing unit is configured to construct a detector resp...

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Abstract

The invention discloses a method and system for on-line reconfiguration of reactor core power distribution based on local nonlinear correction, including: calculating the local nonlinear correction coefficient matrix A according to the discrete state of the three-dimensional grid of the reactor core; with a given background physical field F b , determine the physical field F to be reconstructed a and the background physics field F b The difference relationship of the local nonlinear correction; according to the layout of the detector, the detector response matrix H is constructed; according to the detector response matrix H, the difference relationship between the theoretical measurement value of the physical field to be reconstructed and the real detector measurement value is established; Establish the cost equation according to the data assimilation equation, and obtain the physical field F to be reconstructed by minimizing the solution of the cost equation a . The invention has simple operation, the local nonlinear correction coefficient matrix A does not depend on the background physical field, and significantly improves the efficiency of online reconstruction of the physical field.

Description

Technical field [0001] The present invention relates to nuclear reactor core operation and safety technology, and in particular, the method and system relating to a core power distribution based on local nonlinear correction. Background technique [0002] Nuclear reactor core power distribution online monitoring is of great significance to improving the safety of reactive reactors and improving nuclear power plant economics. However, the core power distribution is not a direct monitoring amount, but is indirectly measured by the measuring of neutron flux density. In order to measure the pile of flux density in real time, a neutron detector is installed in the reactor or except for the reactor, but these neutron detectors are only arranged at a particular location and the number is limited, so if the spatial continuous power distribution Real-time monitoring, studying the method of reconstructing the core power distribution is necessary. [0003] One of the core technologies of th...

Claims

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Application Information

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Patent Type & Authority Patents(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