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Fuel assembly with cluster type control rod inserted therein

A fuel assembly and control rod technology, which is applied in the direction of reactor fuel elements, assembly of fuel elements, nuclear power generation, etc., can solve the problems of not being able to satisfy the hydraulic buffer of the control rod assembly inserted into the top of the core at the same time, and achieve the reduction of component power peak factor, High structural strength and the effect of reducing the impact force of falling rods

Active Publication Date: 2016-09-07
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing fuel assemblies with cross-shaped passages cannot simultaneously satisfy the insertion of the top of the core and realize the hydraulic buffering of the control rod assembly, and provide a solution that can not only realize the insertion of the control rod assembly from the top of the core, but also realize A Fuel Assembly with Interposed Bundle Type Control Rods for Hydraulic Damping of Control Rod Assemblies

Method used

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  • Fuel assembly with cluster type control rod inserted therein
  • Fuel assembly with cluster type control rod inserted therein
  • Fuel assembly with cluster type control rod inserted therein

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Embodiment 1

[0028] A fuel assembly with interposed beam-type control rods, such as figure 1 As shown, four unit assemblies arranged in a 2×2 manner are included, and the walls of the four unit assemblies form a cross-shaped channel 1 .

[0029] The improvement of the present invention is that: the cross channel 1 is provided with closely arranged guide pipes 3 which are convenient for the insertion of the control rods, such as figure 2 shown. The closely arranged guide tubes 3 form mutual support in the cross-shaped channel 1 to prevent displacement; meanwhile, the guide tubes 3 are hollow structures, which can accommodate the control rods inserted in the bundled rod type control rod assembly, so that Insert the core from top to bottom from the top of the core, so as to realize the control of the core reactivity.

[0030] At the same time, the guide tube 3 can effectively increase the hydraulic buffer when the control rods are inserted, thereby effectively reducing the impact force of ...

Embodiment 2

[0032] The difference between this embodiment and Embodiment 1 is that this embodiment optimizes the structure of the guide tube 3, and the specific settings are as follows: the guide tube 3 is composed of a guide section 31, a diameter-reducing section 32 and a buffer section 33, as image 3 shown.

[0033] In this embodiment, by optimizing the structure of the guide tube 3, the diameter of the buffer section 33 at the bottom end of the guide tube 3 is smaller than that of the top guide section 31, thereby further increasing the hydraulic buffering effect when the control rod is inserted into the guide tube 3, and reducing the impact of the control rod on the fuel assembly. rod impact force, extending the life of control rods and fuel assemblies.

Embodiment 3

[0035] The difference between this embodiment and embodiment 1 or embodiment 2 is that the guide pipe 3 in this embodiment is circular and there is a water gap between it and the cross channel 1 . Through the setting of the water gap, the water squeezing effect of the guide tube can significantly improve the power distribution of the module in the state of lifting the rod, and then reduce the power peak factor of the module.

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Abstract

The invention discloses a fuel assembly with a cluster type control rod inserted therein. The fuel assembly mainly solves the problem of existing fuel assemblies provided with a cross-shaped channel that insertion from the top of a rector core and hydraulic buffering of a control rod assembly can not be achieved at the same time. The fuel assembly comprises four element components arranged in a 2*2 mode, and a cross-shaped channel (1) is formed by the wall surfaces of the four element components. The fuel assembly is characterized in that guide tubes (3) which are arranged closely and facilitate insertion of the control rod are arranged in the cross-shaped channel (1). The fuel assembly has the advantages that the control rod assembly can be inserted in from the top of a reactor core, and hydraulic buffering of the control rod assembly can be achieved.

Description

technical field [0001] The invention relates to a fuel assembly, in particular to a fuel assembly in which bundled rod type control rods are inserted. Background technique [0002] In PWRs, for reactor fuel assemblies with a cross-shaped channel structure, the control rod assemblies are generally designed to be inserted from the top of the core. In order to ensure the smooth drop of the cross-shaped control rods during operation, a relatively large gap is usually considered between the control rods and the cross-shaped channels of the fuel assembly, so it is difficult to achieve its buffering effect by using the hydraulic buffer form of the traditional bundle-type control rod assembly. In order to achieve the purpose of effective buffering, mechanical buffering design is mostly used at present. [0003] In a boiling water reactor, for a reactor fuel assembly with a cross-shaped channel structure, the control rod assembly is inserted into the fuel assembly from the bottom of...

Claims

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Application Information

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IPC IPC(8): G21C3/328G21C3/33
CPCG21C3/328G21C3/33Y02E30/30
Inventor 朱发文冯琳娜庞华雷涛李翔邢硕张坤张吉斌
Owner NUCLEAR POWER INSTITUTE OF CHINA
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