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High-value neutron absorber material for control rod

A neutron absorber and control rod technology, applied in the field of nuclear materials, can solve problems such as unsatisfactory absorption value, low design flexibility, and inability to meet the shutdown depth requirements, so as to improve the comprehensive performance of nuclear physics and enhance the safety of the core performance and increased design flexibility

Active Publication Date: 2020-02-21
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ag-In-Cd alloy rods are currently the most commonly used absorber material for commercial control rods, and have similar initial reactivity values ​​and consumption rates to Hf rods, the main problem with Hf rods and Ag-In-Cd alloy rods is their absorption value Not ideal, applied to higher power reactors, the design flexibility is very low or even unable to meet the shutdown depth requirements

Method used

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  • High-value neutron absorber material for control rod
  • High-value neutron absorber material for control rod
  • High-value neutron absorber material for control rod

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Embodiment 1

[0024] The present invention proposes a high-value control rod neutron absorber material comprising at least one first component and at least one second component, wherein the first component has good neutron absorption Ability, the second component and the first component enhance the stability of the first component by forming a stable compound. The initial reactivity value of the neutron absorber material is not lower than that of silver-indium-cadmium (Ag-In-Cd) alloy rods, and the rate of change of reactivity value with fuel consumption is not faster than that of Ag-In-Cd alloy rods.

[0025] Specifically, the first group is Dy 2 o 3 , the second component is Al 2 o 3 , that is, the first component and the second component form an orthorhombic perovskite structure DyAlO 3 when, according to figure 1 The nuclear physics evaluation results shown show that DyAlO 3 The initial reactivity value of the pellet is about 17% higher than that of the Ag-In-Cd alloy rod with the...

Embodiment 2

[0027] The present invention proposes a high-value control rod neutron absorber material comprising at least one first component and at least one second component, wherein the first component has good neutron absorption Ability, the second component and the first component enhance the stability of the first component by forming a stable compound. The initial reactivity value of the neutron absorber material is not lower than that of silver-indium-cadmium (Ag-In-Cd) alloy rods, and the rate of change of reactivity value with fuel consumption is not faster than that of Ag-In-Cd alloy rods.

[0028] Specifically, the first group is Dy 2 o 3 and Sm 2 o 3 (the molar ratio of substances is 9:1), the second component is Al 2 o 3 , that is, the first component and the second component form an orthorhombic perovskite structure Dy 0.9 SM 0.1 AlO 3 when, according to figure 2 The results of the nuclear physics evaluation shown show that Dy 0.9 SM 0.1 AlO 3 The initial reacti...

Embodiment 3

[0030] The present invention proposes a high-value control rod neutron absorber material comprising at least one first component and at least one second component, wherein the first component has good neutron absorption Ability, the second component and the first component enhance the stability of the first component by forming a stable compound. The initial reactivity value of the neutron absorber material is not lower than that of silver-indium-cadmium (Ag-In-Cd) alloy rod, and the rate of change of reactivity value with fuel burnup is not faster than that of Ag-In-Cd.

[0031] Specifically, the first group is Dy 2 o 3, the second component is Al 2 o 3 and HfO 2 (the molar ratio of substances is 97:3), that is, the first component and the second component form an orthogonal perovskite structure DyAl 0.97 f 0.03 o 3 when, according to image 3 The nuclear physics evaluation results shown show that DyAl 0.97 f 0.03 o 3 The initial reactivity value of pellets is abou...

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Abstract

The invention discloses a high-value neutron absorber material for a control rod. The neutron absorber material comprises at least one first component and at least one second component, wherein the first component has good neutron absorption capacity, and the second component and the first component can form a stable compound. The initial reactivity value of the neutron absorber material is not lower than the initial reactivity value of an Ag-In-Cd alloy bar, and the change rate of the reactivity value along with fuel assembly burnup is not faster compared with Ag-In-Cd. The nuclear physical properties of the neutron absorber material disclosed by the invention are superior to the nuclear physical properties of common commercial absorber materials, the limit value of use temperature is remarkably improved, and design flexibility and reactor core safety are improved.

Description

technical field [0001] The invention relates to the technical field of nuclear materials, in particular to a high-value control rod neutron absorber material. Background technique [0002] The control rod assembly is the reactor control component that controls the reactivity of the core by insertion and extraction in the fuel assembly. Under normal working conditions, they are used to start the reactor, adjust the power of the reactor, and shut down the reactor. Under accidental conditions, they rely on their own gravity to quickly descend, so that the reactor can be shut down in a very short time to ensure safety. [0003] The absorber material inside the control rod plays a major role in absorbing in the control rod assembly. Currently, the common neutron absorber materials for control rods include boron carbide (B 4 C) pellets (EP0364910A2, JP200221437A), hafnium (Hf) rods (US5742655A), silver-indium-cadmium (Ag-In-Cd) alloy rods (US4699756A1) and dysprosium titanate (Dy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C7/103G21C7/24
CPCG21C7/103G21C7/24Y02E30/30
Inventor 陈向阳卢俊强张兆泉刘婵云陈军程熙月范武刚李聪
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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