Anti-foreign matter plate of light water reactor nuclear fuel component and bottom device

Abstract

The invention provides an anti-foreign matter plate of a light water reactor nuclear fuel component. The anti-foreign matter plate comprises an edge part, a plurality of pipe orifice units and a plurality of filtering hole units, wherein the plurality of the pipe orifice units are arranged on the inner side of the edge part like an independent array, and the plurality of the filtering hole units are flatly laid and arranged between the edge part and the plurality of the pipe orifice units. The invention further provides a bottom device of the light water reactor nuclear fuel component. The bottom device comprises the anti-foreign matter plate. Compared with the prior art, as the pipe orifice units of the anti-foreign matter plate disclosed by the invention are arranged like the independent array and the filtering hole units are flatly laid and arranged, the number of the filtering hole units on the anti-foreign matter plate can be maximized under the same situations, the circulation area of cooling water can be further increased, the resistance of the cooling water when the cooling water passes through the anti-foreign matter plate, and the loss of pressure drop can be also reduced.

Description

technical field [0001] The invention relates to a light water reactor, in particular to an anti-foreign matter plate and a bottom device of a nuclear fuel assembly of a light water reactor. Background technique [0002] A light water reactor consists of a core consisting of a number of prismatic fuel assemblies arranged side by side in a vertical position. The fuel assembly comprises a framework consisting of longitudinal ducts and grids and secured by two header means, within which fuel rods are seated. One of the fuel assembly's two header assemblies, known as the bottom assembly, sits on the lower core plate, which has holes drilled at the location of each fuel assembly to allow the reactor's cooling water to flow vertically upwards through the core. With long-term operation, some sharp foreign objects such as screws, nuts, and metal cuttings are easily mixed into the cooling water. If these foreign objects enter the fuel assembly, they will easily cause abrasion to the...

AI Technical Summary

Problems solved by technology

However, due to the presence of wider ribs between filter hole units, the number of filter hole units is affected, and the flow area of ​​the foreign matter prevention plate is reduced, resulting in additional pressure drop loss

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