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Long-lived fission product processing method using neutrons

A technology for fission products and processing methods, applied in neutron sources, targets for generating nuclear reactions, nuclear engineering, etc., can solve problems such as the existence of neutron generating parts, limited locations, and difficult LLFP nuclear transformation processing.

Inactive Publication Date: 2018-12-21
KYOTO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, a very long target with a length of 1 m or more in the beam incident direction is required, and the neutron generator cannot be located in a limited place.
Therefore, it is difficult for this method to efficiently perform nuclear transformation processing on LLFP

Method used

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  • Long-lived fission product processing method using neutrons
  • Long-lived fission product processing method using neutrons
  • Long-lived fission product processing method using neutrons

Examples

Experimental program
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no. 1 approach

[0052] refer to figure 1 A method for treating long-lived fission products (LLFP) according to one embodiment of the present invention will be described. figure 1 The neutron generation system shown in has an FFAG accelerator 10 , a primary beam source 16 , and a plate-shaped target 18 . The FFAG accelerator 10 is a plurality of sector magnets (sector magnet) 12 and at least one (in figure 1 Two) high-frequency acceleration devices 14 are configured in a ring shape.

[0053] In this FFAG accelerator 10 , primary particles including neutrons are introduced from a primary beam source 16 . The primary particles are not particularly limited as long as they contain neutrons, but deuterium nuclei (that is, deuterons) or tritium nuclei are preferably used. This is because, when these particles collide with the plate-shaped target 18, the above-mentioned break up reaction is easily caused. The energy per nucleon when the primary particles are introduced is preferably 1 / 4 to 1 / 2 of...

no. 2 approach

[0069] refer to figure 2 A method for treating long-lived fission products (LLFP) according to another embodiment of the present invention will be described.

[0070] The structure and structure of high-energy first neutrons and low-energy second neutrons generated by FFAG accelerator 10 figure 1 The first embodiment shown is the same, and thus description thereof will be omitted. In this embodiment, if figure 2 As shown, the first LLFP 20 is not arranged in front of the beam of the first neutron, but the second target 36 placed in the first space 32 of vacuum or atmosphere is arranged, so that the beam of the first neutron and the second target The target 36 collides.

[0071] The structure in the vicinity of the second target 36 will be described. The housing 28 is divided into a first space 32 and a second space 34 by a partition wall 30 . The first space 32 is set to vacuum or air, and the second target 36 is arranged therein. A substance (graphite, etc., not shown...

no. 3 approach

[0076] refer to image 3 A method for treating long-lived fission products (LLFP) according to still another embodiment of the present invention will be described.

[0077] The structure and structure of high-energy first neutrons and low-energy second neutrons generated by FFAG accelerator 10 figure 1 The first embodiment shown is the same, and thus description thereof will be omitted. Furthermore, in this embodiment, with figure 2 Similarly, the first LLFP 20 is not arranged in front of the beam of the first neutron, but the second target 36 placed in the first space 32 of vacuum or atmosphere is arranged so that the beam of the first neutron is in contact with the second target 36. The target 36 collides. Regarding the structure near the second target 36, in this embodiment, the second space 34 is filled with deuterium-tritium molecule (DT molecule) gas at 10 to 100 atmospheres. figure 2 Are the same.

[0078] When the energy of the neutron beam is 300 MeV or more, w...

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Abstract

The present invention provides a long-lived fission product processing method using neutrons that makes it possible to generate high intensity neutrons using only an accelerator without using a fast reactor or an accelerator-driven reactor and efficiently cause nuclear transmutation in long-lived fission products (LLFPs). In the present invention, high-energy first neutrons that form a beam in a single direction are generated through the breaking up of deuterons or other primary particles including neutrons as a result of the acceleration of the primary particles in an FFAG accelerator 10 under prescribed conditions such that the primary particles collide with a plate-like target 18, and low-energy, diffuse second neutrons are generated through the excitation of nuclei in the plate-like target. A first LLFP 20 is disposed in the travel direction of the first neutron beam and a second LLFP 24 is disposed in the vicinity of the plate-like target 18.

Description

technical field [0001] The present invention relates to methods of processing long-lived fission products based on the use of accelerator-generated neutrons. Background technique [0002] Disposal of long-lived fission products (LLFP: Long-Lived Fission Products) discharged along with the operation of nuclear reactors is the biggest problem in utilizing atomic energy. Under the current situation, buried treatment by geological disposal is envisaged, but there are great objections. In addition, a technique is known in which LLFP is radioactively detoxified by nuclear conversion using neutrons generated by nuclear fission in a fast neutron reactor or an accelerator-driven nuclear reactor. [0003] Here, secondary particles such as neutrons and negative muons, which are generated by colliding primary particles such as protons accelerated by an accelerator to high energy, collide with a fixed nuclear target, and carry out radioactive detoxification treatment on LLFP through ato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/00G21K5/02H05H3/06H05H6/00
CPCH05H3/06H05H6/00H05H13/085G21F9/30G21K5/02G21G4/02G21G1/06G21F9/001G21F9/007G21K5/04
Inventor 森义治
Owner KYOTO UNIV
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