Lower pipe seat and bottom device of light-water reactor nuclear fuel assembly

Abstract

The invention provides a lower pipe seat of a light-water reactor nuclear fuel assembly. The lower pipe seat comprises a frame body, a plurality of first main ribs, a plurality of second main ribs, and a plurality of pipe fitting installation parts, wherein the first main ribs are arranged in the frame body in parallel at intervals, the second main ribs are arranged in the frame body in parallel at intervals, the frame body comprises a first diagonal line and a second diagonal line which is intersected with the first diagonal line, a plurality of first main ribs and / or a plurality of second main ribs are parallel to the first diagonal line and / or the second diagonal line, a plurality of first main ribs and a plurality of second main ribs are intersected to divide the interior of the frame body into a plurality of through drain holes; and a plurality of pipe fitting installation parts are respectively arranged at positions where a plurality of first main ribs and a plurality of second main ribs are intersected. The invention further provides a bottom device of the light-water reactor nuclear fuel assembly. According to the lower pipe seat, a plurality of first main ribs and / or a plurality of second main ribs are parallel to the first diagonal line and / or the second diagonal line respectively, so that the performance of the lower pipe seat can be effectively prompted.

Description

technical field [0001] The invention relates to a light water reactor, in particular to a lower pipe seat and a bottom device of a light water reactor nuclear fuel assembly. 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 large 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 fuel rods drive...

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in the lower tube base

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