Efficient filtering lower tube seat, fuel assembly and nuclear reactor

Abstract

The invention discloses an efficient filtering lower tube seat, a fuel assembly and a nuclear reactor. The lower tube seat is composed of a connecting plate and supporting legs; the connecting plate is designed into square grids which are densely and regularly arranged, an S-shaped curved surface array is adopted in the grids to form a flow channel for filtering foreign matters, and straight ribs are adopted to divide the S-shaped curved surface array into single completely-closed flow channels. The flow channel of the lower tube seat is composed of the S-shaped curved surface array, the filtering effect and the circulation effect are good, and compared with a C-shaped curved surface, the S-shaped curved surface is small in deflection and better in circulation capacity and deformation resistance capacity; a long flow guide section is reserved at the upper end of a S-shaped curved flow channel, so that the water flow direction at the outlet is consistent.

Description

technical field [0001] The invention belongs to the technical field of fuel assemblies, and in particular relates to a high-efficiency filter down pipe seat, a fuel assembly and a nuclear reactor. Background technique [0002] The lower nozzle is the lower structural part of the reactor fuel assembly, which provides support, positioning and distribution of coolant flow for the fuel assembly. In addition, since the coolant flows through the fuel assembly at a very fast speed during the operation of the reactor, the coolant may The contained foreign matter will damage the fuel rods, resulting in the risk of fuel rod breakage. In order to limit this risk, the lower nozzle needs to have the function of filtering foreign matter to prevent foreign matter from flowing into the fuel assembly. [0003] Regarding the lower pipe seat with foreign matter filtering function, there are various patents and documents both at home and abroad to describe (such as Figure 6-10 Shown prior art ...

AI Technical Summary

Problems solved by technology

[0004] (1) In terms of design, due to the limitation of the assembled design, the size of the flow channel grid is relatively large, the ability to filter short and small foreign matter is weak, and the improvement of the filtration performance is not optimal;

[0005] (2) The assembled design is more cumbersome for the manufacturer, the connection or welding between the blade and the rib is very difficult, prone to defects, and the production efficiency is low

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