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Reflector used for spallation neutron source

A technology of spallation neutron sources and reflectors, applied in the field of reflectors, can solve the problems that reflector structures cannot be compared, achieve long service life, accurate installation and positioning, and realize the effects of remote maintenance operations

Active Publication Date: 2017-08-25
DONGGUAN NEUTRON SCI CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, each spallation neutron source must have a reflector, but because the power of each spallation neutron source is different, the structure of the reflector cannot be compared

Method used

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  • Reflector used for spallation neutron source
  • Reflector used for spallation neutron source
  • Reflector used for spallation neutron source

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0044] Such as figure 1 As shown, a reflector for a spallation neutron source, the reflector is in the shape of a stepped cylinder as a whole, mainly including the lower section 1 of the reflector, the connecting ring 2, the middle section of the reflector and the reflector connected by long bolts The upper section 5 and the connecting ring 2 are used to connect the lower section 1 of the reflector and the lower section 3 of the middle section of the reflector.

[0045] Such as Figure 2-5 As shown, the overall shape of the lower part of the reflector 1 is a cylindrical structure, mainly including the lower part of the reflector body 11, the lower water inlet pipe 12 and the lower water outlet pipe 13, wherein the lower part of the reflector body 11 mainly includes the outer airtight aluminum container 111 and The lower reflector 114 , the middle reflector 112 and the upper reflector 113 are vertically installed inside the aluminum container 111 from bottom to top.

[0046] ...

Embodiment 1

[0062] Embodiment 1: Real-time monitoring of the temperature of the lower section 1 of the reflector in the reflector used for the spallation neutron source

[0063] In order to monitor the internal temperature and surface temperature of the lower section 1 of the reflector in real time, six thermocouples are installed, two of which are installed inside the aluminum container 111, respectively above the target channel and the proton channel, and the thermocouple wires Pass through the middle of the internal reflector of the aluminum container 111 and lead out from the lower outlet pipe 13. Since the lower outlet pipe 13 is filled with cooling water, the surface of the thermocouple cannot be welded. The present invention uses a ferrule to solve the sealing problem of the outlet point of the thermocouple; That is, the thermocouple wires pass through the ferrule, the fixed end of the ferrule is welded to the lower outlet pipe 13, and the joint part of the ferrule is tightened to c...

Embodiment 2

[0064] Example 2: Remote maintenance of a reflector used for a spallation neutron source

[0065] The design life of the reflector plug-in in the present invention is ten years, and it needs to be disassembled and lifted out after the expiration of the service period. Since the reflector plug-in is a high-radiation component, the whole disassembly and hanging-out process must be operated by remote control; the present invention adopts Special long bolts and hoisting studs realize remote maintenance of reflector inserts.

[0066] First determine the lifting parts and maintenance tools: the reflector insert as a whole includes three sets of M42 long bolts, four in each set, and the length has two specifications of 860mm and 1330mm; the hexagon head size of the long bolts is the standard M42 outer hexagon bolt head size To ensure the versatility of the long bolts, in order to facilitate the remote positioning of the pneumatic wrench, the height of the hexagonal head is increased ...

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Abstract

The invention relates to the spallation neutron source technology field and especially relates to a reflector used for a spallation neutron source. A whole body of the reflector is in a step cylinder shape. The reflector mainly comprises a lower segment of the reflector, a connecting ring, a middle segment of the reflector and an upper segment of the reflector which are connected through a long bolt. The connecting ring is used for connecting the lower segment of the reflector and a lower portion of the middle segment of the reflector. Aiming at an actual condition of spallation neutron source apparatus construction of our country, the invention provides the reflector which is customized for the spallation neutron source apparatus of our country. The reflector is suitable for a neutron source in a present situation of our country. A component structure adopted by the reflector satisfies each physical demand in the spallation neutron source. Components can be processed and manufactured, and installation and positioning are accurate. During an operation process, an internal temperature in the lower segment of the reflector can be monitored in real time so that an influence of a local high temperature on a material is prevented. In the invention, a service life is long, and remote control maintenance can be performed; after a service period is ended, through remote control operation, remote dismounting and hoisting are realized; and remote maintenance operation of a whole plug-in is realized too.

Description

technical field [0001] The invention relates to the technical field of spallation neutron sources, in particular to a reflector for spallation neutron sources. Background technique [0002] Both neutrons and X-rays are powerful means for human beings to explore the microscopic structure of matter. Compared with nuclear reactor neutron sources, spallation neutron sources have many unique properties: higher pulse flux, abundant high-energy short-wave neutrons, superior pulse time structure, lower background, and do not use nuclear fuel, Only a very small amount of activated product is produced. [0003] At present, pulsed spallation neutron sources in operation or construction in the world mainly include SNS in the United States, J-PARC in Japan, ISIS in the United Kingdom, and ESS in Europe. The Oak Ridge National Laboratory in the United States has a spallation neutron source SNS with a designed beam power of 1.4 MW. The total investment of the project is 1.4 billion US d...

Claims

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Application Information

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IPC IPC(8): G21G4/02
CPCG21G4/02
Inventor 杜文婷胡春明
Owner DONGGUAN NEUTRON SCI CENT
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