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A method for recovering uranium from pressurized water reactor and applying it to heavy water reactor

A technology for recycling uranium and heavy water reactors, which is applied in the fields of reactors, manufacturing reactors, and reducing greenhouse gases. Fuel cost, cost-effective utilization, avoidance of high radioactive effects

Active Publication Date: 2018-02-13
THIRD QINSHAN NUCLEAR POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high cost of fuel manufacturing and the high cost of core conversion, this fuel has not yet seen examples of demonstration or engineering applications

Method used

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  • A method for recovering uranium from pressurized water reactor and applying it to heavy water reactor
  • A method for recovering uranium from pressurized water reactor and applying it to heavy water reactor
  • A method for recovering uranium from pressurized water reactor and applying it to heavy water reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0039] According to recovered uranium 235 The enrichment degree of U is higher than that of natural uranium. Depleted uranium (DU) is mixed with recycled uranium. By accurately adjusting the mixing ratio of recycled uranium and depleted uranium, the nuclear characteristics of the mixture are equivalent to natural uranium fuel. This mixture is hereinafter referred to as equivalent natural uranium. The invention uses equivalent natural uranium to replace the natural uranium, and produces the fuel for the heavy water reactor on the fuel production line of the heavy water reactor.

[0040] Specific steps are as follows:

[0041] (1) Use a mass spectrometer to measure the metallic uranium content, uranium isotopic composition and / or uranium isotopic distribution in recovered uranium and depleted uranium;

[0042] (2) According to the uranium isotope composition of recovered uranium and depleted uranium in step (1), use the formula to calculate the mixing ratio α and 1-α of recove...

Embodiment 2

[0053] The invention uses equivalent natural uranium to replace the natural uranium, and produces the fuel for the heavy water reactor on the fuel production line of the heavy water reactor.

[0054] Specific steps are as follows:

[0055] (1) Use a mass spectrometer to measure the metallic uranium content, uranium isotopic composition and / or uranium isotopic distribution in recovered uranium and depleted uranium;

[0056] (2) According to the uranium isotope composition of recovered uranium and depleted uranium in step (1), use the mixture calculation program developed based on neutronics calculation program WIMS-AECL, or WIMS-D, or MCNP calculation to achieve the same ratio as natural Uranium equivalent recycled uranium and depleted uranium mixing ratio α and 1-α, 0<α≤1 and NUE target value;

[0057] (3) Accurately weighing the recovered uranium and depleted uranium according to the ratio described in step (2), and then physically mixing them to form equivalent natural uran...

Embodiment 3

[0063] The invention uses equivalent natural uranium to replace the natural uranium, and produces the fuel for the heavy water reactor on the fuel production line of the heavy water reactor.

[0064] Specific steps are as follows:

[0065] (1) Use a mass spectrometer to measure the metallic uranium content, uranium isotopic composition and / or uranium isotopic distribution in recovered uranium and depleted uranium;

[0066] (2) According to the uranium isotope composition of recovered uranium and depleted uranium in step (1), the mixing ratio α and 1-α of recovered uranium and depleted uranium equivalent to natural uranium are calculated by using a mixture calculation program, 0<α≤1 and NUE target value;

[0067] The mixture calculation program is a computer program developed based on the calculation of the neutronics calculation program WIMS-AECL, or WIMS-D, or MCNP.

[0068] (3) Accurately weigh the recovered uranium and depleted uranium according to the ratio described in ...

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Abstract

The invention provides a method for applying uranium recycled from a pressurized water reactor to a heavy water reactor. The method replaces natural uranium with natural uranium equivalent to produce a fuel for the heavy water reactor on a heavy water reactor fuel production line. The natural uranium equivalent is prepared through the following steps: (1) measuring the metal uranium content, uranium isotope composition and / or uranium isotope distribution of recycled uranium and depleted uranium by using a mass spectrometer; (2) according to the uranium isotope composition of the recycled uranium and depleted uranium, calculating the mixing ratios alpha and 1-alpha of the recycled uranium and depleted uranium and target value of natural uranium equivalent according to a formula or mixing computation procedure so as to achieve the effect equivalent to the effect of natural uranium; 3) accurately measuring the recycled uranium and depleted uranium and then carrying out physical mixing so as to form natural uranium equivalent; (4) carrying out sampling analysis on the natural uranium equivalent formed through mixing; and (5) replacing natural uranium with the natural uranium equivalent to produce the fuel for the heavy water reactor. The method provided by the invention avoids the influence of high radioactivity of the recycled uranium, realizes economic high-efficiency utilization of the recycled uranium and reduces cost of the fuel of the heavy water reactor.

Description

technical field [0001] The invention relates to nuclear fuel recycling, in particular to a method for utilizing uranium recovered from a pressurized water reactor (abbreviated as RU) on a heavy water reactor. Background technique [0002] PWRs generally use natural low-enriched uranium (LEU) as fuel. The fuel is discharged from the core after being irradiated in the reactor for a certain period of time, and is called spent fuel. About 94% of the spent fuel in the PWR is uranium, which is called recovered uranium (also known as post-reactor uranium) after being separated and extracted by reprocessing technology. The uranium isotopic composition of recovered uranium is different from that of natural uranium (NU for short), and artificial isotopes are added to recovered uranium 232 U 234 U, 236 U and traces of fission products and actinides (such as Pu and Am, etc.). recovered uranium 234 U content is generally higher than natural uranium, 235 U enrichment is about 0.8%-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/00
CPCG21C21/00Y02E30/30
Inventor 张振华陈明军孟智良乔刚樊申
Owner THIRD QINSHAN NUCLEAR POWER
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