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Prompt-neutron-attenuation-constant obtaining method, device, equipment and system

A technology of prompt neutron and decay constant, which is applied in the field of subcritical reactor experimental measurement, can solve the problems of the influence of PNS method accuracy and difficulty in obtaining the prompt neutron fundamental wave decay constant accurately.

Pending Publication Date: 2019-03-19
NANHUA UNIV
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Problems solved by technology

[0003] Due to the coexistence of the fundamental wave of the prompt neutron and the high-order harmonic in the subcritical reactor, the interference of the high-order harmonic makes it difficult to accurately obtain the attenuation constant of the fundamental wave of the prompt neutron in the PNS experiment
This leads to a compromise in the accuracy of the actual PNS method for subcriticality measurements, especially for subcritical reactivity measurements in deep subcritical reactors

Method used

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[0052]In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0053] Please refer to figure 1 , figure 1 It is a flowchart of a method for obtaining a prompt neutron decay constant in an embodiment of the present invention, and the method includes the following steps:

[0054] S101. Using a pulsed neutron source to inject periodic pulsed neutrons into the subcritical reactor.

[0055] A pulsed neutron source is used to inject periodic pulsed neutrons into a subcritical...

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Abstract

The invention discloses a prompt-neutron-attenuation-constant obtaining method. The prompt-neutron-attenuation-constant obtaining method includes the following steps that periodic pulse neutrons are injected into a subcritical reactor through a pulse neutron source; in a target pulse period, neutron counting rate time spectrums of different positions in the subcritical reactor are obtained; specific values of the obtained neutron counting rate time spectrums of the different positions are computed, and relative neutron counting rate time spectrums are obtained; through the relative neutron counting rate time spectrums, a target moment when prompt-neutron higher-order harmonic attenuation is completed is determined; in the target pulse period, the neutron counting rate between the target moment and an ending moment of the pulse period is subjected to exponential attenuation fitting processing, and a prompt-neutron fundamental-wave attenuation constant is obtained. The more-accurate prompt-neutron fundamental-wave attenuation constant under the condition that interference of prompt-neutron higher-order harmonic waves does not exist can be obtained. The invention also discloses a prompt-neutron-attenuation-constant obtaining device, equipment and system and a readable storage medium, and the prompt-neutron-attenuation-constant obtaining device, equipment and system and the readable storage medium have corresponding technical effects.

Description

technical field [0001] The invention relates to the technical field of subcritical reactor experimental measurement, in particular to a method, device, equipment, system and readable storage medium for obtaining a prompt neutron decay constant. Background technique [0002] The pulsed neutron source method (PNS), which measures the subcritical reactivity by recording the response characteristics of the subcritical reactor under the condition of pulsed neutron injection, is currently the most effective and accurate measurement method for subcritical reactivity recognized in the world. The fundamental decay constant of the prompt neutron is the key to the PNS method. [0003] Due to the coexistence of the fundamental wave of prompt neutrons and high-order harmonics in subcritical reactors, the interference of high-order harmonics makes it difficult to accurately obtain the attenuation constant of fundamental wave of prompt neutrons in PNS experiments. This has affected the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/00
CPCG01T3/00
Inventor 谢金森于涛谢芹陈珍平赵鹏程曾文杰谢超刘紫静
Owner NANHUA UNIV
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