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Nuclear fuel pellets, manufacturing method and nuclear reactor

A technology for nuclear fuel and fuel, which is applied in the manufacture of reactors, reactors, and reactor fuel materials, etc., can solve the problems of low utilization rate and waste of nuclear fuel, and achieve the effects of avoiding waste, improving conversion ratio, and reducing initial excess reactivity.

Active Publication Date: 2016-01-06
CHINA NUCLEAR POWER TECH RES INST CO LTD +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Due to the long-term shielding of the fissile material in the central area of ​​the fuel pellet by the peripheral nuclear fuel material, the utilization rate is low, resulting in the waste of nuclear fuel in the central area during unloading

Method used

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  • Nuclear fuel pellets, manufacturing method and nuclear reactor
  • Nuclear fuel pellets, manufacturing method and nuclear reactor
  • Nuclear fuel pellets, manufacturing method and nuclear reactor

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no. 1 example

[0030] Such as figure 1 Shown is a first embodiment of the nuclear fuel pellet of the present invention, the nuclear fuel pellet includes nuclear fuel material.

[0031] The nuclear fuel pellet includes a first fuel region 11 and a second fuel region 12 arranged from inside to outside. In this embodiment, the nuclear fuel pellet is a cylindrical pellet, the first fuel region 11 and the second fuel region 12 are arranged non-uniformly along the radial direction, and the second fuel region 12 surrounds the periphery of the first fuel region 11 .

[0032] It can be understood that the nuclear fuel pellets may also be fuel pellets of other shapes, such as spherical pellets, flat pellets, and the like. When spherical pellets are used, the first fuel region 11 and the second fuel region 12 are distributed non-uniformly in the radial direction, ensuring that the second fuel region 12 wraps around the first fuel region 11; and when flat pellets are used, the first The fuel region 11...

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Abstract

The invention relates to a nuclear fuel pellet which comprises nuclear fuel materials. The nuclear fuel pellet at least comprises a first fuel zone and a second fuel zone which are arranged from inside to outside, wherein the reactivity of the nuclear fuel material of the first fuel zone is lower than that of the nuclear fuel material of the second fuel zone. The nuclear fuel with lower reactivity is arranged at the center of the nuclear fuel pellet, thereby avoiding the problem of low nuclear fuel material utilization ratio in the central zone, having the action of reducing fissible material residues in the discharge fuel, and avoiding the waste of the nuclear fuel materials.

Description

technical field [0001] The present invention relates to fuel for nuclear power plants, and more particularly, to a nuclear fuel pellet that can be used in nuclear power plants. Background technique [0002] There are three kinds of fissile materials U233, U235 and Pu239. But only U235 exists naturally, and U233 and Pu239 need to be transformed by Th232 and U238 after absorbing a neutron. The enrichment degree of U235 in natural uranium is 0.71%, which is low. So core designers have been pursuing more efficient use of nuclear fuel. [0003] No matter the design of the existing nuclear fuel pellets is uranium, uranium-plutonium mixture, uranium-thorium mixture, plutonium-thorium mixture, or gadolinium-containing uranium pellets, they are uniform in radial direction. The fissile material in the central area of ​​the fuel pellet is shielded by the peripheral nuclear fuel material for a long time, and the utilization rate is low, resulting in the waste of nuclear fuel in the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/02G21C3/58G21C21/02
CPCY02E30/30
Inventor 马兹容张勇
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD
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