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Reactor starting neutron source

A neutron source and reactor technology, which is applied in the field of neutron source for new reactor start-up, to achieve the effect of reducing the cost

Inactive Publication Date: 2011-10-26
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of the isotope starting neutron source used in the current reactor, the present invention aims to provide a new starting neutron source which not only satisfies the nuclear safety regulations, but also overcomes the defects of the existing isotope starting neutron source

Method used

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Embodiment 1

[0040] Taking Qinshan No. 2 Nuclear Power Plant as an example, the core layout of the nuclear power plant is as follows: figure 2As shown, the original design required two primary initiation neutron sources and two secondary initiation neutron sources. According to the technical scheme provided by the present invention, a D-T neutron tube neutron source can be used, and the intensity of the neutron tube neutron source is 1×10 7 n / sec-1×10 9 n / sec, the diameter of the outer tube is 30-20mm, and when the neutron tube uses metal titanium as the adsorption material, the temperature resistance is greater than or equal to 120°C; the service life is greater than or equal to 1000 hours.

[0041] The specific operation can be carried out by a fission chamber driving mechanism similar to the neutron flux measurement, that is, it is driven by a mechanical-electrical driving mechanism. The placed position can be the position of the original primary start-up neutron source or the second...

Embodiment 2

[0044] Another example is that Tianwan Hydropower Station is passively started. There are several holes with a diameter of 60mm on the coaming plate of its pressure vessel, which are used to place high-sensitivity neutron detectors. If a neutron tube is used to start, one detector can be reduced, while Use this tunnel as the tunnel for placing the neutron tube. At this time, a D-D neutron tube or a DTT mixed neutron tube can be used, and the intensity of the neutron source of the neutron tube is 5×10 8 n / sec-1×10 9 n / sec, the diameter of the outer tube is 50-40mm, and when the neutron tube uses metal scandium as the adsorption material, the temperature resistance is greater than or equal to 450°C; the service life is greater than 1000 hours.

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Abstract

The invention discloses a novel reactor starting neutron source. A neutron pipe neutron source is used to replace an isotope neutron source to become a reactor primary starting neutron source or / and secondary starting neutron source. Compared to the ordinary isotope neutron source, the novel reactor starting neutron source has a high neutron yield, a good power spectrum monochromaticity and no [gamma] background. Besides, pulse neutrons can be generated and the source can be cut off when it is not used. Therefore, it is easy to protect the source and convenient to store, manage and transport the source.

Description

technical field [0001] The invention belongs to the technical field of reactor neutron monitoring, and in particular relates to a novel reactor start-up neutron source. Background technique [0002] After the reactor is built or refueled, in order to monitor and implement the criticality of the reactor, the nuclear safety regulations of most countries except Russia stipulate that a neutron source that can provide sufficient high neutron fluence is required for safe start-up. At present, the starting neutron sources used are all isotopic neutron sources. The physical start-up of research reactors does not have high requirements for starting the neutron source. If the neutron information cannot be monitored during start-up, the monitoring information can be obtained by adjusting the position of the neutron source or detector, but for nuclear power plants, due to the The structure of the core is complex, and the position of the neutron source or detector cannot be adjusted, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21G4/02
Inventor 史永谦朱庆福
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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