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Fuel subassembly fixing device of reloadable liquid heavy metal reactor

A liquid heavy metal and fuel assembly technology, which is applied in the assembly of fuel elements, climate sustainability, and greenhouse gas reduction, etc., can solve the problems of high buoyancy, large safety impact, poor stability, etc. Stress, strengthen the effect of positioning

Inactive Publication Date: 2012-07-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Due to the inherent physical properties of the lead-bismuth coolant, its density is much higher than that of the existing liquid metal sodium fast reactor, which will generate greater buoyancy for the structural parts, and the force generated by the coolant flowing upwards in the core must also be considered , so the interior of the core only relies on the hydraulic self-tightening of the components to complete the fixation of the components, and its stability is poor. Once the components move, it will have a great impact on safety

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  • Fuel subassembly fixing device of reloadable liquid heavy metal reactor
  • Fuel subassembly fixing device of reloadable liquid heavy metal reactor
  • Fuel subassembly fixing device of reloadable liquid heavy metal reactor

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Embodiment Construction

[0022] Such as figure 1 As shown, from the relative positions between the fuel assembly 4 and the upper core grid 1 and the lower core grid 9, it can be known that the upper part of the fuel assembly 4 is in contact with three springs 3 in each hexagonal cell 6. Under relatively high conditions (that is, large thermal expansion and deformation), the three springs 3 provide axial positioning for the assembly, withstand the vibration of the fuel assembly 4 in the stack due to the flow of coolant, and prevent the axial movement of the fuel assembly 4 The 4 metal buttons 10 of the lower pins of the fuel assembly 4 slide into the annular groove 11 of the mounting hole 15 during the loading process of the fuel assembly 4. face support. In the refueling condition, the refueling operation machine grabs the fuel assembly operating head, and the rest of the mechanical structure pushes the spring 3 out of the range of the fuel assembly 4, and moves the fuel assembly 4 down until the met...

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Abstract

The invention relates to a fuel subassembly fixing device of a reloadable liquid heavy metal reactor, which consists of an upper grid tray of a reactor core, a fuel assembly and a lower grid tray of the reactor core. The main body of the fuel assembly is hexagonal, wherein the upper part of the fuel assembly extends into a honeycomb structure of the upper grid tray of the circular reactor core and is supported by a double-bump spring on the inner wall of the honeycomb structure. A slipknot is arranged at a pin of the fuel assembly to hook a circular groove of an installation hole of the upper grid tray of the reactor core to form lower constraint. The device has the functions of fixing the fuel assembly of the reactor and fixing the assembly, prevents the fuel elements from shuttling in the liquid heavy metal reactor and can reload the reactor online.

Description

technical field [0001] The invention belongs to the field of core structural components of a heavy metal cooling nuclear reactor, in particular to a fuel assembly fixing device of a refuelable liquid heavy metal reactor. Background technique [0002] With the intensification of the global warming effect and the change of the world's climate, nuclear power has been paid more and more attention. The rapid development of nuclear power will inevitably bring about the problem of nuclear waste disposal. Accelerator-driven subcritical system (ADS) has the functions of realizing transmutation treatment of high-level nuclear waste and production of nuclear fuel, and has received extensive attention from the international community in recent years. [0003] The accelerator-driven subcritical system (ADS) uses the neutrons generated by the high-energy protons produced by the accelerator to bombard the spallation target as the neutron source, and a continuous chain reaction occurs with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/34
CPCY02E30/40Y02E30/30
Inventor 何梅生柏云清汪卫华陈钊
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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