Neutron absorber material, preparation method thereof and control rod

A neutron absorber and absorber technology, which is applied in the control of nuclear reactions, manufacturing reactors, reducing greenhouse gases, etc., can solve the problems of high airtightness and mechanical strength of control rods, inconvenient processing and use, and short service life. , to achieve excellent anti-radiation swelling, long service life, and small radiation creep effect

Inactive Publication Date: 2020-09-11
CHINA NUCLEAR POWER ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ag-In-Cd alloy has good neutron absorption performance, and it still has sufficient neutron absorption cross-section even after the three elements of Ag, In and Cd undergo isotopic transmutation, and is widely used in commercial pressurized water reactor nuclear power plants. However, Ag-In-Cd alloy materials will have obvious radiation swelling and radiation creep behavior during use, and the cost is high; although boron carbide is cheaper, it consumes very quickly, has a short service life, and needs to be replaced regularly , and gas will be generated during use, which needs to be packaged and used. The control rod made of boron carbide has high requirements on the sealing and mechanical strength of the control rod during the entire operating life, and it is inconvenient to process and use.

Method used

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  • Neutron absorber material, preparation method thereof and control rod
  • Neutron absorber material, preparation method thereof and control rod
  • Neutron absorber material, preparation method thereof and control rod

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preparation example Construction

[0039] Correspondingly, the present invention also discloses a method for preparing the above-mentioned neutron absorbing material, including:

[0040] S1 pulping: by weight, prepare a slurry with 30-90 parts of europium oxide raw material and 10-70 parts of hafnium oxide raw material, and grind the solid particles in the slurry to below the submicron level;

[0041] S2 powder making: drying the prepared slurry below the submicron level, then pulverizing and sieving to obtain powder particles with the required particle size;

[0042] S3 Compression molding: Press the sieved powder particles into plain embryos;

[0043] S4 sintering: sintering the plain embryo at high temperature to obtain the neutron absorber material.

[0044] And, the present invention also discloses a control rod, which includes a cladding and an absorber, the absorber is arranged in the inner space of the cladding, and the absorber is processed by using the neutron absorber material mentioned above.

Embodiment 1

[0046] This embodiment discloses a method for preparing a neutron absorber material, which includes the following steps:

[0047] S1 pulping: by weight, take 30-90 parts of europium oxide raw material and 10-70 parts of hafnium oxide raw material to prepare slurry, and grind the solid particles in the slurry to below the submicron level.

[0048] Among them, the purity of the europium oxide raw material is 95-100%, and the purity of the hafnium oxide raw material is 80-100%.

[0049] Specifically, the europium oxide raw material and hafnium oxide raw material are added to the solvent according to the above ratio, a dispersant is added, and ball milling is performed at a speed of 150-200r / min for 2-24 hours to obtain a slurry with a solid particle size below the submicron level (that is, the particle size of the solid particles is less than 100nm), and the distribution of europium oxide and hafnium oxide in the slurry below the submicron level is more uniform, and the performan...

Embodiment 2

[0065] Such as Figure 5 As shown, this embodiment discloses a control rod, including a cladding 3, an end plug, and an absorber 4, wherein the absorber 4 is processed by using the neutron absorbing material prepared by the method described in Example 1.

[0066] Specifically, the absorber 4 is arranged in the inner space of the casing 3, and the absorber 4 is preferably arranged in multiple sections, so as to reduce damage to the control rods caused by radiation swelling and the like. The end plugs include a first end plug 1 and a second end plug 5 , which are respectively arranged at two ends of the casing 3 , and can be sealed and connected by means of welding or the like, and the absorber 4 is clamped inside the casing 3 . The cladding 3 can be made of stainless steel or nickel-based alloy. In some alternative embodiments, one of the end plugs (such as Figure 5 One end of the second end plug 5) in the middle is set to a sharp shape, and on the other (such as Figure 5 ...

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Abstract

The invention discloses a neutron absorber material and a preparation method thereof. The preparation method comprises the following steps: S1, preparing 30-90 parts by weight of an europium oxide rawmaterial and 10-70 parts by weight of a hafnium oxide raw material into slurry, and grinding solid particles in the slurry to be below a submicron level; s2, drying the prepared slurry below the submicron level, and then crushing and sieving the slurry to obtain powder particles with required particle sizes; s3, pressing the sieved powder particles into a biscuit; and S4, carrying out high-temperature sintering on the biscuit to obtain the neutron absorber. The invention further discloses a control rod, and an absorber of the control rod adopts a neutron absorbing material. The method is simple in process, and the prepared neutron absorbing material and the control rod are small in irradiation swelling, small in irradiation creep and long in service life.

Description

technical field [0001] The invention belongs to the field of nuclear technology, and in particular relates to a neutron absorber material, a preparation method thereof, and a control rod. Background technique [0002] In the design of nuclear reactors, control rods are commonly used to control the reactivity. The lifting and insertion of control rods are used to control the reactivity of nuclear reactors. [0003] Currently, control rod designs for nuclear reactors are usually made of Ag-In-Cd alloy or boron carbide as the absorber material. Ag-In-Cd alloy has good neutron absorption performance, and it still has sufficient neutron absorption cross-section even after the three elements of Ag, In and Cd undergo isotopic transmutation, and is widely used in commercial pressurized water reactor nuclear power plants. However, Ag-In-Cd alloy materials will have obvious radiation swelling and radiation creep behavior during use, and the cost is high; although boron carbide is che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/622G21C7/06G21C21/18
CPCC04B35/48C04B35/50C04B35/622G21C21/18G21C7/06C04B2235/5445C04B2235/656C04B2235/6567C04B2235/96Y02E30/30
Inventor 易璇徐敏贺楷米爱军霍小东范武刚张兆泉
Owner CHINA NUCLEAR POWER ENG CO LTD
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