A low pressure drop anti-foreign matter fuel assembly down tube seat

A fuel assembly and foreign matter prevention technology, which is applied in the directions of reactor fuel elements, fuel element assembly, nuclear power generation, etc., can solve problems such as abrasion and damage of fuel rod cladding, and achieve the balance of foreign matter prevention functions, uniform flow distribution, and pressure drop balance. Effect

CN103247351BActive Publication Date: 2015-11-25SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-11-25

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Abstract

The invention provides a low-pressure-drop foreign matter prevention type lower pipe seat of a fuel assembly. The lower pipe seat comprises a supporting framework and a lower pipe seat grating fixed above the supporting framework, wherein the lower pipe seat grating comprises two layers of plates, the plate on one layer is a macroporous plate, and the plate on the other layer is a grid plate arranged above or below the macroporous plate; the grid plate is of a netty grid structure composed of vertical slices; the macroporous plate is of a flat plate structure matched with the grid plate in size, and a plurality of columns and rows of drain holes are uniformly formed in the macroporous plate; and each large circular drain hole is divided by grids of the grid plate into a plurality of parts on the overlooking projection, and each large circular drain hole is formed to avoid the projection position of a fuel bar. According to the lower pipe seat of the fuel assembly, provided by the invention, has the function of uniform flow rate distribution and can realize the balance of the strength, pressure drop and a foreign matter prevention function of the lower pipe seat as the macroporous plate is matched with the grid plate. The grid plate structure ensures the sufficient foreign matter filtering capability after the aperture is increased.
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Description

technical field

[0001] The invention relates to fuel assembly technology, in particular to a low pressure drop anti-foreign object fuel assembly lower nozzle. Background technique

[0002] The fuel assembly is a critical component of the nuclear reactor core, which generates heat energy and transfers this heat energy to the coolant. The lower nozzle is located at the bottom of the fuel assembly. It is the lower interface and supporting part of the fuel assembly. It provides lateral and axial positioning for the lower end of the fuel assembly, bears the full weight of the fuel assembly and the load from the interior of the fuel assembly, internal components and related components. At the same time, the lower tube seat is also the entrance for the coolant to enter the core, and plays a role in flow distribution for the coolant.

[0003] At present, the main pressurized water reactor fuel assemblies in the world all adopt the lower pipe seat with the function of preventing for...

Examples

Embodiment Construction

[0023] The lower nozzle of the low-pressure-drop anti-foreign matter fuel assembly according to the present invention will be further described below with reference to the drawings and specific embodiments.

[0024] A fuel assembly lower nozzle base according to the present invention includes a support frame 9 and a lower nozzle grid plate 8 welded and fixed above the support frame 9 .

[0025] The lower pipe seat grid plate 8 includes two layers of plates, one of which is a large hole plate, and the other layer is a grid plate arranged above or below the large hole plate. The grid plate and the large hole plate are fixed together by welding or riveting.

[0026] Such as Figure 4 As shown, the grid plate is a mesh grid structure composed of vertical sheets. The grid plate may be provided with a connecting plate 3 at a position corresponding to each guide pipe and instrument pipe. A small flow hole 4 is respectively provided at the four corners of each connecting plate 3 . ...