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Gray control rod and absorber

A technology of control rods and absorbers, which is applied in the field of reactivity control in nuclear power plants, can solve problems such as limiting the service life of gray control rod components, and achieve the effect of low irradiation creep effect and prolonging service life

Active Publication Date: 2013-02-06
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gray control rod assembly stays in the core for about half of the time, and the irradiation swelling and irradiation creep of the Ag-In-Cd alloy are very serious, which will cause the cladding of the gray control rod to be in a very short time. reached its strain limit within a short time, limiting the service life of the gray control rod assembly
[0006] Therefore, there are many problems in using Ag-In-Cd alloy as the absorber of gray control rod components, and there is still a lot of room for improvement.

Method used

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Embodiment 1～3

[0022] The ash control rod of the present invention is a two-layer slender solid tubular structure arranged concentrically; the ash control rod is covered with a cladding tube made of stainless steel or nickel-based alloy.

[0023] The inner tube is made of tantalum metal, and the diameter of the inner tube is 1.8mm;

[0024] The outer tube is made of Ag-In-Cd alloy, the inner diameter of the outer tube is 1.8mm, and the outer diameter is 2.4mm.

[0025] The specific composition of the gray control rod is shown in Table 1 below.

[0026] Table 1

[0027]

[0028] like 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 wit...

Embodiment 4～28

[0031] The absorber material for gray control rods of the present invention includes component A and component B, and the specific composition and proportion of the absorber material are shown in Table 2 below. (The absorber material may also contain impurities such as Mo, Nb, N, Si, etc. not exceeding 2%)

[0032] Table 2

[0033]

[0034]

Embodiment 29～31

[0036] The ash control rod described in the present invention is an elongated solid tubular structure made of tantalum alloy. The gray control rod is clad with a cladding tube made of stainless steel or nickel-based alloy. The specific composition of the gray control rod is shown in Table 3. (The absorber material may also contain Mo, Nb, N, Si and other impurity components that do not exceed 2%.)

[0037] table 3

[0038]

[0039] The invention is not strictly limited to the examples described. The method proposed according to the invention can be applied to any nuclear reactor to provide reactivity control for load following process and reactivity control for full power operation.

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Abstract

The invention provides a gray control rod and an absorber. An absorber material comprises tantalum, a tantalum alloy or a tantalum compound, wherein the tantalum element occupies 30 to 99.8 percent of the 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 the tantalum, the tantalum alloy or the tantalum compound, wherein the tantalum element occupies 30 to 99.8 percent of the mass percentage of the absorber material. According to the invention, the tantalum, the tantalum alloy or the tantalum compound is adopted, so that the obtained tendency that the reactivity worth of the gray control rod is reduced along with the fuel consumption is obviously delayed; and the irradiation swelling and irradiation creep effects are also very low, so that the service life of a gray control rod assembly is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of reactivity control of nuclear power plants, and in particular relates to an ash control rod and an 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, thereby great...

Claims

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Application Information

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IPC IPC(8): G21C7/10G21C7/103
CPCY02E30/39Y02E30/30
Inventor 陈磊丁谦学毕光文韩建春朱丽兵卢俊强杨伟焱黎辉
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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