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Three-dimensional distribution measurement system for neutrons in reactor based on measurement data outside reactor

A measurement system and three-dimensional distribution technology, which is applied in the field of neutron spectrum measurement and calculation in the reactor to achieve the effect of strong practical value

Active Publication Date: 2019-05-17
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing methods can only be used to observe reactor flux / power distribution, and do not consider further inversion of neutron energy distribution

Method used

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  • Three-dimensional distribution measurement system for neutrons in reactor based on measurement data outside reactor
  • Three-dimensional distribution measurement system for neutrons in reactor based on measurement data outside reactor
  • Three-dimensional distribution measurement system for neutrons in reactor based on measurement data outside reactor

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Embodiment 1

[0034] see figure 1 : A three-dimensional neutron distribution measurement system in a reactor based on external measurement data of the present embodiment, including a reactor power inversion subsystem, an online spectral analysis subsystem and an external detector subsystem;

[0035] The reactor power inversion subsystem is used to obtain neutron measurements in the area around the reactor, and the detector subsystem outside the reactor changes the number, position and detection direction of detectors according to real-time monitoring needs;

[0036] The online spectral analysis subsystem receives measurement data from the external detector subsystem, and calculates the neutron energy spectrum at the detector position through the online spectral analysis method, and then transmits the energy spectrum data of each detection position to the reactor power feedback Acting subsystem;

[0037] The reactor power inversion subsystem calculates the neutron energy spectrum at differe...

Embodiment 2

[0039] A three-dimensional neutron distribution measurement system in a reactor based on external measurement data in this embodiment has basically the same structure as that in Embodiment 1, the main difference is that the reactor power inversion subsystem is based on energy spectrum grouping response The reactor power inversion subsystem of the matrix core neutron energy spectrum inversion method, the reactor power inversion subsystem of the core neutron energy spectrum inversion method based on the energy spectrum grouping response matrix includes the following steps:

[0040] S1. Establish the neutron transport model M of the reactor including reactor structural materials and nuclear fuel, and input the neutron energy division determined by the neutrons you want to analyze {e 1 ,...,e E}, according to the reactor structure and characteristics, divide the reactor into R space partitions to form a set of space partitions as {a 1 ,…,aR}, form a total of N=E*R space energy pa...

Embodiment 3

[0051] This embodiment takes the inversion of the energetic neutron flux field of a subcritically driven reactor as an example to describe the present invention as a whole:

[0052] like figure 2 As shown, three to four groups of multi-threshold detectors are arranged on the periphery of the reactor core, and corresponding driving mechanisms are added to construct an ex-core detector subsystem that can move within a certain range. For example, it can be respectively 238 U ionization chamber, 235 U ionization chamber, cadmium-coated boron-coated ionization chamber, and recoil proton detector; thus, measurements of different energy thresholds in different regions outside the heap can be obtained;

[0053] The measured value is transmitted to the online spectral analysis subsystem, and the preset spectrum is constructed through the ratio relationship of the measured values ​​of different threshold detectors, combined with the existing few-channel spectral analysis method in the...

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Abstract

The invention discloses a three-dimensional distribution measurement system for neutrons in a reactor based on measurement data outside the reactor. A reactor power inversion subsystem is used for obtaining neutron measurement values in areas around the reactor, and the out-of-reactor detector subsystem changes the number, positions and detection directions of detectors according to real-time monitoring needs; an online spectrum unfolding subsystem receives the measurement data from the out-of-reactor detector subsystem, calculates neutron energy spectra at the detector positions by an onlinespectrum unfolding method, and then transmits energy spectrum data at each detection position to the reactor power inversion subsystem; and the reactor power inversion subsystem calculates the neutronenergy spectra at different spatial positions in the reactor through the energy spectrum data at the out-of-reactor detectors. The three-dimensional distribution measurement system can rely on the out-of-reactor detectors only to quickly obtain the distribution of the neutrons in the reactor in different space and energy zones, and can be used in monitoring, diagnosis and analysis of advanced reactors such as critical driven reactors, fusion driven reactors and fast neutron reactors.

Description

technical field [0001] The invention relates to the technical field of neutron energy spectrum measurement and calculation in a reactor, in particular to a three-dimensional neutron distribution measurement system in a reactor based on external measurement data. Background technique [0002] The measurement of neutron energy spectrum is closely related to the safety performance and economic performance of the reactor. The measurement of neutron energy spectrum is very important for fuel performance research, shielding analysis and material activation research. The transmutation efficiency has a significant impact and is of great significance to the accurate calculation of power distribution. [0003] The mobile detectors usually used in the early pressurized water reactors cannot realize long-term real-time monitoring of the power in the reactor due to the harsh service environment inside the core. At present, there are self-powered detectors that can serve in the core for ...

Claims

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Application Information

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IPC IPC(8): G21C17/108
CPCY02E30/30
Inventor 吴宜灿胡丽琴龙鹏程甘佺郝丽娟吴斌孙光耀宋婧
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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