A long-life gray control rod and absorber

A technology for absorbers and control rods, applied in the field of reactivity control in nuclear power plants, can solve problems such as reducing or no longer satisfying the reactivity value of ash control rod components, and achieve the effect of prolonging the service life

Active Publication Date: 2015-08-26
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Ag-In-Cd alloy has a relatively large neutron absorption cross-section, especially the neutron absorption cross-section of the product of the naturally occurring isotope transmutation of the three elements of Ag, In and Cd is significantly reduced, which will lead to gray control rod components The reactivity value of the ash control rod assembly decreased to about 80% of the initial value in about 5 years, which no longer meets the requirements of the MSHIM model for the reactivity value of the gray control rod assembly, so a new gray control rod assembly must be replaced

Method used

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  • A long-life gray control rod and absorber
  • A long-life gray control rod and absorber

Examples

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Embodiment 1

[0021] A kind of long-life ash control rod of the present invention, it is elongated solid tubular structure, is made of thulium oxide (Tm 2 o 3 )production. The gray control rod is clad with a cladding tube made of stainless steel or nickel-based alloy.

[0022] Such as figure 1 As shown, the existing gray control rod design uses Ag-In-Cd alloy as the absorber. The Ag-In-Cd alloy has a relatively large neutron absorption cross-section, especially the neutron absorption cross-section of the product of the naturally occurring isotope transmutation of the three elements of Ag, In and Cd is significantly reduced, so the Ag-In-Cd The reactivity value of the ash control rod with the alloy as the absorber decreases very quickly with the burnup, and drops to about 80% of the initial value in about 5 years, which no longer meets the requirements of the MSHIM model for the reactivity value of the ash control rod assembly .

[0023] Such as figure 1 As shown, Tm is used in this em...

Embodiment 2～15

[0025] The absorber material for long-life gray control rods of the present invention contains one or more of thulium, thulium alloy or thulium oxide, and the specific composition is shown in Table 1 below. (The absorber material may also contain impurity components such as Gd, Tb, Dy, Eu, Sm, Er, Ho, etc. not exceeding 2%.)

[0026] Table 1

[0027]

[0028]

Embodiment 16

[0030] A long-life gray control rod according to the present invention, the gray control rod is a concentrically arranged inner and outer two-layer slender solid tubular structure; the gray control rod is covered with a cladding tube made of stainless steel or nickel-based alloy.

[0031] The inner tube is made of thulium oxide, and the diameter of the inner tube is 3mm;

[0032] The outer tube is made of Inconel 718 alloy, the inner diameter of the outer tube is 3mm, and the outer diameter is 8mm;

[0033] Wherein, the thulium element in the gray control rod accounts for 13% of the total mass percentage of the gray control rod.

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Abstract

The invention provides a long service life gray control rod and an absorber. An absorber material comprises one or more of thulium, a thulium alloy or a thulium compound. The absorber material comprises one or more of the thulium, the thulium alloy or thulium oxide, wherein the thulium element occupies 10 to 99.9 percent of the total mass percentage of the absorber material. The gray control rod is a slender solid tubular structure; and the gray control rod is made of the material comprising one or more of the thulium, the thulium alloy or the thulium compound. According to the gray control rod and the absorber which are disclosed by the invention, mainly, the thulium, the thulium alloy or the thulium compound is used as the absorber material, so that the variation of the reactivity worth of a gray control rod assembly along with the fuel consumption is very small, the service life of the gray control rod assembly is greatly prolonged and the gray control rod assembly can be used for over 20 years.

Description

technical field [0001] The invention belongs to the technical field of reactivity control of nuclear power plants, and in particular relates to a long-life gray control rod and absorber material. Background technique [0002] Nuclear power plants typically utilize the lifting and insertion of control rod assemblies to control reactor power. The control rods used in nuclear power plants are generally divided into two categories, black control rods and gray control rods. Gray control rods have less absorbing neutron absorbers and therefore have lower reactivity values ​​than black control rods. [0003] During the operation of the reactor, the operation mode of mechanical compensation (MSHIM) is used for reactivity control, that is, the use of gray control rods instead of chemical compensation (adjustment of boron concentration) provides reactivity control for load following process and full power operation. Minimizes the need to routinely handle main reactor coolant, thereb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C7/10G21C7/103
CPCY02E30/39Y02E30/30
Inventor 刘家正杨伟焱朱丽兵卢俊强梅其良汤春桃陈磊毕光文
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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