CN-121996895-A - Method and device for determining critical resistance coefficient of steam generator pipeline of nuclear reactor

CN121996895ACN 121996895 ACN121996895 ACN 121996895ACN-121996895-A

Abstract

The embodiment of the application provides a method and a device for determining a critical resistance coefficient of a steam generator pipeline of a nuclear reactor, and relates to the technical field of nuclear power. The method comprises the steps of determining a plurality of flow data corresponding to a pipeline in a steam generator under any candidate resistance coefficient, determining a target amplitude threshold corresponding to the pipeline based on the plurality of flow data of the pipeline and a preset initial amplitude threshold, determining a maximum amplitude value corresponding to the pipeline according to the plurality of flow data of the pipeline, and taking the current candidate resistance coefficient as a critical resistance coefficient corresponding to the pipeline when the maximum amplitude value of the pipeline is greater than or equal to the target amplitude threshold of the pipeline. The method provided by the embodiment can improve the accuracy of the critical resistance coefficient of the pipeline.

Inventors

Ruan Tianming
YAN YALUN
CHEN FANG
JIN DESHENG
ZHENG XIONG
LIN JIMING
CAI DECHANG
MAO YULONG
HU YISONG
GAO YAXIN
MENG SHUQI

Assignees

中广核研究院有限公司
中广核南方科技有限公司
中国广核电力股份有限公司

Dates

Publication Date: 20260508
Application Date: 20251204

Claims (10)

1. A method of determining a critical resistance coefficient of a steam generator conduit of a nuclear reactor, the method comprising: determining a plurality of flow data corresponding to the pipeline in the steam generator under any candidate resistance coefficient; Determining a target amplitude threshold corresponding to the pipeline according to the plurality of flow data of the pipeline and a preset initial amplitude threshold; Determining a maximum amplitude value corresponding to the pipeline according to the plurality of flow data of the pipeline; And when the maximum amplitude value of the pipeline is greater than or equal to the target amplitude threshold value of the pipeline, taking the current candidate resistance coefficient as the critical resistance coefficient corresponding to the pipeline.
2. The method of claim 1, wherein determining a plurality of flow data for each of the tubes in the steam generator at any one of the candidate drag coefficients comprises: under the candidate resistance coefficient, obtaining a plurality of original flow rates respectively corresponding to the pipelines; And respectively carrying out noise reduction treatment on the plurality of original flow corresponding to the pipeline to obtain the plurality of flow data corresponding to the pipeline.
3. The method according to claim 2, wherein the noise reduction process comprises the steps of: performing signal decomposition on the original flow in a time dimension, and determining a first component corresponding to the original flow; Performing a wavelet packet threshold-based noise reduction process on the first component containing noise, and determining a second component; signal reconstructing the first and second components of the noise-containing signal to determine the flow data of the pipe.
4. The method of claim 1, further comprising, prior to said determining a target amplitude threshold value for the pipe based on the plurality of flow data for the pipe and a preset initial amplitude threshold value: Performing frequency domain analysis on the plurality of flow data of the pipeline to determine the periodic frequency corresponding to the pipeline; Determining a period of time that does not include the periodic frequency as an aperiodic period of time, the aperiodic period of time being used to determine the target amplitude threshold; and determining a period of time containing the periodic frequency as a periodic period of time, wherein the periodic period of time is used for determining the maximum amplitude value.
5. The method of claim 4, wherein determining the target amplitude threshold corresponding to the pipe based on the plurality of flow data for the pipe and a preset initial amplitude threshold comprises: and determining a target amplitude threshold corresponding to the pipeline according to the flow data of the pipeline in the aperiodic time period and the preset initial amplitude threshold.
6. The method of claim 5, wherein determining a target amplitude threshold for the pipe based on the plurality of flow data and the preset initial amplitude threshold for the pipe over the aperiodic time period comprises: Respectively executing normalization operation on a plurality of flow data of the pipeline in the aperiodic time period, and determining normalization data corresponding to each flow data; determining an aperiodic amplitude value according to the maximum value in all the normalized data; And determining the target amplitude threshold according to the aperiodic amplitude value and the preset initial amplitude threshold.
7. The method of claim 6, wherein said determining said target amplitude threshold from said aperiodic amplitude value and said preset initial amplitude threshold comprises: determining a sum of squares of the aperiodic amplitude value and the preset initial amplitude threshold; and performing open square operation on the square sum to obtain the target amplitude threshold.
8. The method of claim 4, wherein determining a maximum amplitude value for the pipe based on the plurality of flow data for the pipe comprises: determining a minimum flow, a maximum flow and a flow mean value according to the plurality of flow data of the pipeline in the periodic time period; the maximum amplitude value is determined based on the minimum flow, the maximum flow, and the flow average.
9. The method of claim 8, wherein the determining the maximum amplitude value based on the minimum flow, the maximum flow, and the flow average comprises: Determining a difference between the maximum flow and the minimum flow; and determining the maximum amplitude value according to the proportional relation between the difference value and the flow average value.
10. A critical resistance coefficient determination apparatus for a nuclear steam generator pipe of a nuclear reactor, comprising: the data acquisition module is used for determining a plurality of flow data corresponding to the pipeline in the steam generator under any candidate resistance coefficient; the threshold determining module is used for determining a target amplitude threshold corresponding to the pipeline according to the plurality of flow data of the pipeline and a preset initial amplitude threshold; The amplitude value determining module is used for determining the maximum amplitude value corresponding to the pipeline according to the plurality of flow data of the pipeline; And the resistance coefficient determining module is used for taking the current candidate resistance coefficient as the critical resistance coefficient corresponding to the pipeline when the maximum amplitude value of the pipeline is greater than or equal to the target amplitude threshold value of the pipeline.

Description

Method and device for determining critical resistance coefficient of steam generator pipeline of nuclear reactor Technical Field The application relates to the technical field of nuclear power, in particular to a method and a device for determining a critical resistance coefficient of a steam generator pipeline of a nuclear reactor. Background A large number of parallel pipes exist in a direct-current steam generator (onse-Through Steam Generator, OTSG) of a nuclear reactor, and when the direct-current steam generator is operated normally, water in the parallel pipes undergoes a phase change process from cold water to steam-water two phases to superheated steam, so that a flow instability phenomenon occurs in fluid in the parallel pipes. Therefore, it is necessary to adjust the resistance coefficient of the throttle at the inlet of the parallel pipes according to the operation condition of the once-through steam generator to increase the stability of the parallel pipes. In the related flow instability experiment, the critical resistance coefficient corresponding to the given working condition is usually determined by judging whether the actual flow amplitude caused by each candidate throttling resistance coefficient under the given working condition is smaller than a fixed amplitude threshold value. However, the amplitude threshold in the related art is usually a fixed value that is set in advance, and is not adjusted according to the actual situation of the pipeline, so the accuracy of the critical resistance coefficient determined in the related art is low. Disclosure of Invention The embodiment of the application mainly aims to provide a method and a device for determining a critical resistance coefficient of a steam generator pipeline of a nuclear reactor, aiming at improving the accuracy of the critical resistance coefficient of the pipeline in the steam generator. To achieve the above object, a first aspect of an embodiment of the present application provides a method for determining a critical resistance coefficient of a steam generator pipe of a nuclear reactor, the method comprising: determining a plurality of flow data corresponding to the pipeline in the steam generator under any candidate resistance coefficient; Determining a target amplitude threshold corresponding to the pipeline according to the plurality of flow data of the pipeline and a preset initial amplitude threshold; Determining a maximum amplitude value corresponding to the pipeline according to the plurality of flow data of the pipeline; And when the maximum amplitude value of the pipeline is greater than or equal to the target amplitude threshold value of the pipeline, taking the current candidate resistance coefficient as the critical resistance coefficient corresponding to the pipeline. In a possible implementation manner of the first aspect, the determining, at any candidate resistance coefficient, a plurality of flow data corresponding to the pipes in the steam generator respectively includes: under the candidate resistance coefficient, obtaining a plurality of original flow rates respectively corresponding to the pipelines; And respectively carrying out noise reduction treatment on the plurality of original flow corresponding to the pipeline to obtain the plurality of flow data corresponding to the pipeline. In a possible implementation manner of the first aspect, the noise reduction processing includes the following steps: performing signal decomposition on the original flow in a time dimension, and determining a first component corresponding to the original flow; Performing a wavelet packet threshold-based noise reduction process on the first component containing noise, and determining a second component; signal reconstructing the first and second components of the noise-containing signal to determine the flow data of the pipe. In a possible implementation manner of the first aspect, before the determining, according to the plurality of flow data of the pipe and the preset initial amplitude threshold, a target amplitude threshold corresponding to the pipe, the method further includes: Performing frequency domain analysis on the plurality of flow data of the pipeline to determine the periodic frequency corresponding to the pipeline; Determining a period of time that does not include the periodic frequency as an aperiodic period of time, the aperiodic period of time being used to determine the target amplitude threshold; and determining a period of time containing the periodic frequency as a periodic period of time, wherein the periodic period of time is used for determining the maximum amplitude value. In a possible implementation manner of the first aspect, the determining, according to the plurality of flow data of the pipe and a preset initial amplitude threshold, a target amplitude threshold corresponding to the pipe includes: and determining a target amplitude threshold corresponding to the pipeline according to the flow