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Device for mitigating serious accidents for a nuclear fuel assembly, with improved effectiveness

A technology for nuclear fuel assemblies and nuclear fuel rods, applied in the assembly of fuel elements, emergency protection devices, nuclear engineering, etc., can solve the problems of delayed passive safety device effect, long trigger time, passive safety device failure, etc.

Inactive Publication Date: 2013-05-22
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0007] The inventors have discovered that if the fuse mechanism of a passive safety device incorporating neutron absorbing material is triggered for too long, a metallic blockage will become inserted between the fission nuclear fuel and the material designed to stop the fission reaction, thereby disabling the passive safety device Disable or at least delay the effect of passive safety devices

Method used

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  • Device for mitigating serious accidents for a nuclear fuel assembly, with improved effectiveness
  • Device for mitigating serious accidents for a nuclear fuel assembly, with improved effectiveness

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Embodiment Construction

[0031] figure 1 A nuclear fuel assembly 2 comprising a passive safety device 4 according to a first embodiment is shown very schematically.

[0032] This assembly comprises a casing 6 having a longitudinal axis X and generally having a hexagonal cross-section, and nuclear fuel rods 8 arranged substantially in the middle part of said casing.

[0033] The assembly is typically mounted through its lower portion 10 (referred to as the bottom of the assembly) into a core grid (not shown) that supports this assembly and other assemblies, and that provides liquid metal cooling to these assemblies agent. The assembly comprises a liquid metal inlet 12 in the lower part and a liquid metal outlet 14 in the upper part, the liquid metal being delivered by a pump. Thus, the liquid metal circulates from the bottom to the top of the assembly and extracts the heat generated by the fission reaction from the rods.

[0034] The passive safety device 4 according to the invention is arranged in ...

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Abstract

The invention relates to a passive safety device (104) to be arranged in the upper portion of a nuclear fuel assembly (102), comprising: a neutron-absorbing material and a material capable of forming a eutectic having a low melting point, with the material constituting the cladding of the nuclear fuel pins (8) of the assembly (102); and fusible means (28) for retaining said materials in the upper portion of the assembly (102).

Description

technical field [0001] The invention relates to a passive safety device comprising neutron absorbing material, which is integrated into a nuclear fuel assembly. Such assemblies are designed to be placed in the core of a nuclear reactor, especially in the center of a fast neutron nuclear reactor cooled by liquid metal. Background technique [0002] Nuclear reactors include safety devices designed to slow down or even stop the nuclear reactions inside the reactor in the event of an accident. To achieve this, nuclear reactors include control rods suspended above the core and released into the core in the event of an accident. The control rods are made of neutron absorbing material, usually boron carbide. The control rods are suspended eg by means of chain hooks or electromagnets which release the control rods by command. The safety device is so-called active because it requires an external action to be triggered. [0003] Nuclear reactors include redundant safety devices, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C9/02
CPCG21C3/30G21C1/03G21C9/022Y02E30/40Y02E30/30G21C7/06G21C9/02
Inventor 克里斯托夫·朱尼奥
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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