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Integral method for reprocessing spent fuel

A back-end processing and spent fuel technology, applied in the direction of reactor fuel elements, extraction water/sewage treatment, radioactive purification, etc., can solve the problems of insufficient consideration of logistics and radionuclide rationality, and achieve radiation protection and good radiation According to the stability, the effect of simplifying the extraction and purification process

Inactive Publication Date: 2003-10-15
TSINGHUA UNIV
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Problems solved by technology

These processes are based on the connection between the reprocessing process and the separation process of high-level radioactive waste, without fully considering the rationality of logistics and radionuclide direction

Method used

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  • Integral method for reprocessing spent fuel
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Embodiment 1

[0038] The extraction cascade test was carried out at 25°C, and the extraction was carried out according to the process described in the process flow. The specific data are as follows:

[0039] F: Spent fuel element solution containing 3.0 mol / L nitric acid

[0040] o 1 : 0.1mol / L isopropoxy calix[4]crown 6+0.1mol / L dicyclohexyl and 18crown 6-n-octanol solution

[0041] S 1 : 1.5mol / L nitric acid solution

[0042] o 2 : 0.2mol / L N, N, N', N'-tetra(2-ethylhexyl)-3-oxa-glutaramide-90% kerosene+10% n-octanol solution

[0043] S 2 : 1.5mol / L nitric acid solution

[0044] o 3 : 30% tributyl phosphate-kerosene solution

[0045] S 3 : 0.7mol / L nitric acid solution

[0046] Levels: 14 levels in the first section; 16 levels in the second section; 12 levels in the third section

[0047] Organic phase / aqueous phase flow ratios are: 1 / 3-3 / 1; 1 / 3-3 / 1; 2 / 1-5 / 1

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Abstract

The integrated exhausted fuel post-treatment method belongs to the field of circularly utilizing nuclear fuel. The method is to use three kinds of extracting systems, including O1 phase, O2 phase and O3 phase, to treat the exhausted fuel solution from nuclear reactor via sectional multi-stage countercurrent extraction and washing. Sr and Cs in the solution is first extracted to the organic O1 phase; Np, Pu, Am, Cm and other transuranic elements are then extracted to organic O2 phase; U is extracted to organic O3 phase; these three kinds of organic phase are backextracted to obtain three kinds of water solution of Sr+Cs, transuranic elements and U separately; and these three kinds of water solution are further treated. The said process can treating exhausted fuel and high-radioactive waste liquid integrally.

Description

technical field [0001] In the field of nuclear fuel cycle. This technology can be used to treat spent fuel solution and remove highly radioactive fission products 90 Sr, 137 Cs, remove the long-lived transuranic elements neptunium, americium and curium, and recover reusable uranium and plutonium. Background technique [0002] During the operation of nuclear power plants, spent fuel will be produced, which contains recyclable uranium and plutonium, long-lived transuranic elements neptunium, americium and curium, and highly radioactive fission products 90 Sr and 137 Cs. The spent fuel solution is reprocessed to extract usable uranium and plutonium, resulting in high-level radioactive waste. The proper treatment and disposal of high-level liquid waste has become a key factor restricting the sustainable development of nuclear energy. [0003] "Separation-transmutation" technology is a way to solve the hazards of long-lived radionuclides. In the past 20 years, scientific a...

Claims

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Application Information

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IPC IPC(8): C02F1/26G21C19/34G21F9/30
CPCY02E30/30Y02W30/50
Inventor 陈靖张平田国新王建晨
Owner TSINGHUA UNIV
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