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Fuel element and preparation method and application thereof

A fuel element and fuel layer technology, which is applied to fuel elements, reactor fuel elements, and manufacturing reactors, etc., can solve the problems of complicated preparation methods, poor compatibility of molten salts, and high bulk density.

Active Publication Date: 2016-11-23
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

[0007] The technical problem to be solved by the present invention is to provide a fuel element, its preparation method and its use in order to overcome the defects of the existing fuel elements such as high bulk density, poor compatibility of molten salt, and cumbersome preparation methods. The body density of the element is adjustable. When the design parameters are the same, the body density is lower. When the body density is the same, the heavy metal loading is higher. The interface between the fuel layer and the fuel layer is tightly combined, and the shell layer has a dense structure, which can prevent Advantages such as molten salt impregnation; the preparation method is simple and the cost is low

Method used

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  • Fuel element and preparation method and application thereof

Examples

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Effect test

preparation example 1

[0081] The preparation of preparation example 1 spherical phenolic resin base foam carbon

[0082] Take the phenolic resin and hexamethylenetetramine, mix them at a mass ratio of 9:1, and fully dissolve them in absolute ethanol to prepare a resin solution. Put the resin solution into an autoclave, pressurize it to 1MPa with nitrogen gas, and then heat it to 180°C for foaming. After maintaining the temperature for 1 hour, at a temperature of 180° C., the pressure in the reactor was slowly reduced to normal pressure. It was further heated to 300° C., kept at constant temperature for 2 hours, and then cooled to room temperature. The obtained phenolic resin-based foam carbon precursor is carbonized at 900° C. to obtain phenolic resin-based foam carbon.

[0083] Grooves with a width of 1 mm and a depth of 1 mm are opened on the surface of the phenolic resin-based foam carbon by machining, and there are 8 grooves in the warp direction and 8 grooves in the weft direction.

Embodiment 1

[0084] Embodiment 1 The preparation of the fuel element without the fuel layer in the innermost layer

[0085] (1) The density prepared by Preparation Example 1 is 0.5-1.2g / cm 3 1. Grooved phenolic resin-based foamed carbon with a compressive strength of 40-90 MPa, which is used as the fuel-free layer (1);

[0086] (2) Using a quasi-isostatic pressing process or a coating process, the raw material of the fuel layer (2) is evenly coated outside the fuel-free layer (1); the raw material of the fuel layer (2) is formed by mixing TRISO particles and matrix graphite powder. The matrix graphite powder described is 64% natural flake graphite, 16% artificial graphite and 20% phenolic resin, and the matrix graphite powder obtained by processes such as kneading, extruding, crushing and sieving obtains sample (12);

[0087] (3) adopt the quasi-isostatic pressing process, press the shell layer (3) raw material outsourcing in the sample (12); the shell layer (3) raw material is 64% natura...

Embodiment 2

[0089] The fuel element of diameter 3cm that embodiment 2 makes

[0090] With reference to the preparation method of Example 1, a fuel element with a diameter of 3 cm was obtained, and its main parameters are shown in Table 1:

[0091] Table 1

[0092]

[0093]

[0094] The present embodiment single sphere density is 1.70g / cm 3 , the bulk density is smaller than that of the single sphere in Comparative Example 2, but the uranium content of each sphere is 1.4 times that of Comparative Example 2. At the same time, the phenolic resin-based foam carbon has good radiation resistance and good mechanical properties. It has nano-scale (20nm) pores inside and has very low thermal conductivity. It is an excellent thermal insulation material, which is beneficial to fuel Layer heat is transported outward. The average pore size of the shell layer is 1μm, and the compressive strength is 40MPa.

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Abstract

The invention discloses a fuel element and a preparation method and application thereof. The fuel element is a ball and sequentially comprises a fuel-free layer, a fuel layer and a shell layer from inside to outside, and the fuel-free layer, the fuel layer and the shell layer are concentric. The fuel-free layer is spherical phenolic-resin-based foam carbon with the volume density being 0.5-1.2 g / cm<3> and the compressive strength being 40-90 MPa. Grooves are formed in the surface of the phenolic-resin-based foam carbon. The fuel element is adjustable in volume density, the volume density is lower when design parameters are the same, the heavy metal loading capacity is higher when volume densities are the same, interfaces between the fuel-free layer and the fuel layer are closely combined, the fuel element has the advantages that the shell layer is compact in structure and molten salt infiltration can be prevented, the fuel element can be used in a reactor, and the preparation method is simple and low in cost.

Description

technical field [0001] The present invention relates to a fuel element, its preparation method and its use. Background technique [0002] Fuel elements are the core components of the reactor. The quality of fuel elements is the basis for safe and efficient operation of the reactor. The direct goal of fuel element design is to produce and export fission energy most efficiently, maintain the integrity of the cladding material throughout its lifespan, maximize the confinement of fuel and radioactive fission products, and ensure the safety of workers and the surrounding environment. According to the requirements of the reactor for fuel elements and design criteria, as well as the feasibility and economy of fuel element manufacturing, reasonable selection of materials, determination of fuel element structure and design parameters are the main tasks of fuel element design. [0003] Molten salt reactor is one of the candidate reactor types of the fourth generation reactor. In re...

Claims

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Application Information

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IPC IPC(8): G21C3/04G21C3/18G21C21/12
CPCG21C3/042G21C3/18G21C21/12Y02E30/30
Inventor 林俊仲亚娟姜海涛朱智勇
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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