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Super-uranium fuel and preparation method and transmutation method thereof

A technology of uranium fuel and transuranic elements, applied in the field of transuranic fuel and its preparation, to achieve good negative temperature feedback, ensure inherent safety, and simple and feasible preparation

Active Publication Date: 2020-09-04
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of the positive temperature feedback problem in the recovery and utilization of transuranium elements (TRU) in the prior art, the present invention provides a transuranium fuel and its preparation method and transmutation method

Method used

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  • Super-uranium fuel and preparation method and transmutation method thereof
  • Super-uranium fuel and preparation method and transmutation method thereof

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Embodiment 1

[0049] Using transuranic fuel as the fuel of the liquid molten salt reactor and operating the liquid molten salt reactor; wherein, the molar percentage of MA in the TRU of the transuranic fuel is 50%; the TRUF in the transuranic fuel 3 The initial molar percentage of the fuel is 0.134%; the volume ratio of the transuranic fuel to the graphite moderator component 3 is 5%. Initially, the core temperature feedback was -2.7pcm / K. During operation, with the addition of TRUF 3 To maintain the critical value of the core reaction is 1.0 ~ 1.01, the energy spectrum becomes harder, and the core temperature feedback becomes smaller.

Embodiment 2

[0051] TRUF in transuranium fuel 3 The initial molar percentage of is 0.0844%; the volume ratio of transuranic fuel and graphite moderator component 3 is 10%. Other conditions are with embodiment 1. Initially, the core temperature feedback is -1.4pcm / K. During operation, with the addition of TRUF 3 To maintain the critical value of the core reaction is 1.0 ~ 1.01, the energy spectrum becomes harder, and the core temperature feedback becomes smaller.

Embodiment 3

[0053] TRUF in transuranium fuel 3 The initial molar percentage of the fuel is 0.0675%; the volume ratio of the transuranic fuel to the graphite moderator component 3 is 15%. Other conditions are with embodiment 1. Initially, the core temperature feedback is -0.81pcm / K. During operation, with the addition of TRUF 3 To maintain the critical value of the core reaction is 1.0 ~ 1.01, the energy spectrum becomes harder, and the core temperature feedback becomes smaller.

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Abstract

The invention discloses a super-uranium fuel as well as a preparation method and a transmutation method thereof. The super-uranium fuel comprises a base salt and villiaumite of a super-uranium element, the super-uranium element comprises a plutonium element (Pu) and a minor actinide element (MA), and the content of the minor actinide element is not lower than 50%. The transmutation method of the super-uranium fuel comprises the steps that the super-uranium fuel serves as fuel of a liquid molten salt reactor, and the liquid molten salt reactor is operated. The preparation of the super-uranium fuel is simple and feasible, the transmutation method of the super-uranium fuel realizes better negative temperature feedback, and the inherent safety of the liquid molten salt reactor is ensured.

Description

technical field [0001] The invention belongs to the field of nuclear reactor engineering design, and in particular relates to a transuranium fuel and its preparation method and transmutation method. Background technique [0002] The current commercial reactor fuel cycle adopts the "one-off" circulation method and solid-state fuel assemblies. The fuel utilization rate is low, and the high content of highly radioactive transuranium elements (TRU) in spent fuel is a major problem facing the long-term healthy development of nuclear energy. Recycling transuranic elements is one of the effective ways to reduce the current nuclear waste storage and realize the sustainable development of nuclear energy. Due to the high content of fissile elements in TRU in spent fuel (>50%), it can be used as fuel for liquid molten salt reactors, and recycling TRU using liquid molten salt reactors is one of the effective means. However, since fissile elements (such as Pu239 and Pu241) in TRU hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/54G21G1/02
CPCG21C3/54G21G1/02Y02E30/30
Inventor 邹春燕余呈刚伍建辉陈金根蔡翔舟邹杨
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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