Fuel assembly with compact structure, reactor and mobile carrier

Abstract

The invention relates to a fuel assembly with a compact structure, a reactor and a mobile carrier, the fuel assembly with the compact structure comprises a nuclear fixing plate, a plurality of fuel rods, a first guide plate, support rings and throttling fins, the throttling fins are fixed on the outer side walls of one ends of the fuel rods, the plurality of fuel rods are respectively sleeved with the support rings, the first guide plate is arranged on the plurality of fuel rods in a penetrating manner and is supported on the supporting ring, and the other ends of the fuel rods are assembled and fixed on the nuclear fixing plate; and the first guide plate and the support ring are respectively made of a reactor core coolant. The first guide plate restrains and limits the middle of the fuel rod, the first guide plate located in the middle of the fuel rod is limited and supported through the supporting ring, and the first guide plate and the supporting ring are made of a reactor core coolant, are in a solid state at normal temperature to achieve a guide function and are melted before operation to avoid influence on flowing of the reactor core coolant; and the influence on the flow of a reactor core coolant is further reduced, and meanwhile, the adverse influence of a structural material on neutron performance is avoided.

Description

technical field [0001] The invention relates to the technical field related to reactors, in particular to a fuel assembly with a compact structure, a reactor and a mobile carrier. Background technique [0002] The fuel assembly is one of the core components of the reactor, and its structural size affects the design of the core structure, which in turn affects the volume and weight of the reactor, and plays a key role in the miniaturization and compact design of the reactor. At present, the mature design for industrial application is the fuel rod structure. The PWR fuel assembly design is conventionally adopted. It is supported by the upper and lower nozzles and the intermediate grid. Since the intermediate grid constrains the fuel rods through the cells, it needs to occupy a certain amount of space. Design space, but also requires a complex flow regulation structure, which is not conducive to miniaturization design. Some fast reactor fuel assembly designs cancel the interme...

AI Technical Summary

Problems solved by technology

At present, the mature design for industrial application is the fuel rod structure. The PWR fuel assembly design is conventionally adopted. It is supported by the upper and lower nozzles and the intermediate grid. Since the intermediate grid constrains the fuel rods through the cells, it needs to occupy a certain amount of space. Design space, but also requires a complex flow regulation structure, which is not conducive to miniaturization design

Some fast reactor fuel assembly designs cancel the intermediate grid support and constrain the fuel rods through the upper and lower operating heads, which is conducive to the compact design of the assembly, but the outer layer of the assembly is designed with a hexagonal cladding tube, and the cooling agent is designed for the lower operation of the assembly Runner structure, these designs increase the amount of structural materials, which is not conducive to the miniaturization of the core

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