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Fuel element for a compressed water nuclear reactor

A technology for fuel elements and nuclear reactors, applied in the direction of reactor fuel elements, assembly of fuel elements, reactors, etc., can solve problems such as control rod tube deviation, and achieve high-strength effects

Inactive Publication Date: 2007-06-06
AREVA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although in principle plastic deformations are permitted within a limited range, large projections must therefore be avoided, which would lead to a considerable deflection of the control rod guides arranged in the fuel element

Method used

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  • Fuel element for a compressed water nuclear reactor
  • Fuel element for a compressed water nuclear reactor
  • Fuel element for a compressed water nuclear reactor

Examples

Experimental program
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Embodiment Construction

[0027] FIG. 1 shows a 16×16 spacer 4 including the arrangement of support tubes at various positions Pa, as it also occurs in the known spacer and shown in FIG. 8 . All support tubes are control rod guide tubes 12 in the embodiment. No further structural pipes are provided in this embodiment.

[0028] The spacer 4 consists of grille slats 14 1 -14 17 and 16 1 -16 17 Composed, which are welded to each other at each intersection point. Grille 14 1 、14 17 、16 1 、16 17 The edges of the grid are formed and are referred to below as grid edge strips. grille slats 14 2 -14 16 and 16 2 -16 16 Extends into the interior of the grille and is referred to hereinafter as the grille interior slats.

[0029] Each control rod duct 12 defines an interior region 18 partially emphasized by hatching, which in the embodiment is defined by grille slats 14 3 、14 15 、16 3 and 16 15 The defined square area constitutes the interior slats 14 of these grids that comprise the 3 、14 15 、1...

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Abstract

The invention relates to a fuel element for a compressed water nuclear reactor. Said fuel element contains a plurality of fuel rods that are guided into a plurality of axially interspaced spacers (4) respectively forming a quadratic grid consisting of connecting elements (141-17, 161-17) and comprising a plurality of holes (6) that are arranged in rows (10) and columns (8). A control rod guiding tube (12) is respectively guided through a number of said holes (6), and the spacer (4) is structurally embodied in such a way that when a limiting force acting laterally on the spacer (4) is exceeded, a deformation is triggered exclusively in a region of the spacer (4) located outside an inner region (18) containing the control rod guiding tubes (12).

Description

technical field [0001] The invention relates to a fuel element for a pressurized water nuclear reactor, as is known, for example, from DE 196 35 927 C1. Background technique [0002] One such fuel element is illustrated by way of example in FIG. 5 . In one such fuel element, a plurality of fuel rods 2 are guided parallel to each other along the rod direction (axial direction) through a plurality of spacers 4 axially spaced apart from each other, which respectively form a two-dimensional grid comprising a plurality of meshes 6 . The individual meshes are arranged in columns 8 and rows 10 . The meshes 6 passing through the grid also lead at selected points outside the fuel rods through support tubes, which do not contain fuel and serve to receive and guide control rods (so-called control rod ducts 12 ). Furthermore, support tubes are provided which likewise do not contain fuel and are only used to increase stability (instrumentation tubes or structural tubes, in the fuel el...

Claims

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Application Information

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IPC IPC(8): G21C3/34G21C3/332
CPCG21C3/332G21Y2002/305G21C3/34G21Y2002/104Y02E30/40Y02E30/30G21C3/30
Inventor J·斯塔贝尔V·马克思
Owner AREVA GMBH