A Reactivity Measurement Method with Background Current and Source Current Correction

A technology of reactivity measurement and background current, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of difference in reactivity, cannot accurately reflect the total number of fission neutrons in the reactor, and achieve accurate value , Significant economic benefits, the effect of improving the safety level

Active Publication Date: 2018-08-07
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

In many cases, these additional currents account for a significant share of the total current, so the measured current cannot accurately reflect the total number of fission neutrons in the reactor, and the calculated reactivity is also quite different from the real one.

Method used

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  • A Reactivity Measurement Method with Background Current and Source Current Correction
  • A Reactivity Measurement Method with Background Current and Source Current Correction
  • A Reactivity Measurement Method with Background Current and Source Current Correction

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Experimental program
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Effect test

Embodiment

[0088] In order to verify the effect of the present invention, the method is verified with the dynamic stick test data carried out in a certain nuclear power plant.

[0089] According to the foregoing content, functionally speaking, this method can provide background current and source current correction for reactivity measurement experiments such as dynamic engraving. The calculation of this method provides usable data; therefore, this method is closely related to the dynamic engraving rod, and it is also one of the main application directions of this method.

[0090] In order to further verify this method, combined with the main line of the experiment at that time, a verification experiment of this method was applied for during the experiment. The present invention uses a double fitting method to carry out detailed calculation, analysis and verification on this part of the experimental data.

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Abstract

The invention relates to a reactivity measurement method with the background current and source item current correcting function. According to the method, calculation is performed through two-stage fitting; actually-measured current of the reactivity constant segment serves as input of the first-stage fitting, real reactivity without being affected by a background and a source item is obtained through direct calculation, and then control rod integral value is obtained; background current and neutron source intensity can be separated out through the second-stage fitting. According to the method, a theoretical basis is high, consideration is more comprehensive, and the result credibility is higher. Besides, under some conditions and requirements, the control rod integral value can be measured by replacing a traditional dynamic rod engraving method with the method. The control rod value measured through the method is more accurate and higher in credibility, remarkable economic benefits will be brought to a power plant, and the safety level is improved.

Description

technical field [0001] The invention specifically relates to a reactivity measurement method with background current and source current correction, belonging to the field of reactivity measurement of nuclear power plant reactors. Background technique [0002] The reactivity meter calculates the reactivity based on the current signal measured by the detector outside the core, which requires that the current value is proportional to the number of fission neutrons in the core. But in fact, the current measured by the detector includes not only the current caused by the fission neutrons in the reactor, but also the electrical background current caused by the circuit, the source term current caused by the neutrons generated by the neutron source components, and the current caused by the activation products. Gamma background current induced by gamma rays (collectively referred to as background and source current). In many cases, these additional currents account for a significant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 霍兴凯潘泽飞徐李喻宏陈晓亮范振东胡赟
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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