Fuel assembly and fuel rod capable of improving reactor security of fuel assembly

Abstract

The invention relates to a fuel assembly and a fuel rod capable of improving reactor security of the fuel assembly. The fuel assembly comprises an integrated fuel rod body containing a nuclear fuel component; an axial perforative through hole is formed in the middle part of the fuel rod body. The through hole of the fuel rod provided by the invention can remarkably add the heat transfer area, reduce heat flux within a unit area of the fuel rod under the condition of constant reactor capability, and lower the probability of generating departure nucleate boiling; meanwhile the temperature of the center area of the fuel rod can be greatly lowered, thus the safety margin of the fuel rod under normal condition and accident condition of the reactor is greatly increased.

Description

technical field [0001] The invention relates to the technical field of nuclear power, more specifically, to a fuel assembly and a fuel rod for improving reactor safety. Background technique [0002] A nuclear reactor includes a core composed of fuel assemblies, and each group of fuel assemblies itself is composed of multiple bundles of fuel rods, which are kept axially and vertically arranged in the framework of the fuel assembly, so that they are cylindrical The axes of the fuel rods of the shape are parallel to each other. [0003] Non-integrated fuel rods are mainly composed of a cladding tube, an upper end plug, a lower end plug, and a core housed inside the cladding tube. The upper end plug and the lower end plug are arranged at both ends of the cladding tube. The axial length of the cladding tube of each fuel rod is much larger than its cross-sectional diameter. Generally, the fuel rods have a length greater than 4 meters and a diameter of about 10 mm. [0004] Conv...

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Problems solved by technology

[0007] 1. Under a certain operating power of the reactor, the temperature of the center of the fuel rod will be significantly higher than the peripheral temperature, which will limit the linear power density of the fuel rod, thereby affecting the economics of the reactor;

[0008] 2. The maximum temperature of the fuel rods during operation is high, resulting in high energy storage of nuclear fuel during normal operation. In the event of a large breach loss of water accident, the peak temperature of the cladding will increase significantly, shortening the nuclear fuel in severe accidents. Melting time, poor security

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