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On-line removal device for pressurized water reactor fuel assembly fission gas

A fission gas and fuel assembly technology, applied to reactor fuel elements, reduction of greenhouse gases, reactors, etc., can solve problems such as rising fuel pellet center temperature, deteriorating fuel rod heat transfer performance, and increasing the risk of core melting. Achieve high burnup depth, improve neutron economy, and improve efficiency

Active Publication Date: 2019-03-29
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The fission gas in the fuel assembly has a great influence on the thermal conductivity of the fuel assembly. The thermal conductivity of krypton and xenon produced by fission is much smaller than that of the helium prefilled in the fuel assembly, which leads to the deterioration of the heat transfer performance of the fuel rod.
The deterioration of the heat transfer performance of the fuel rods will lead to an increase in the core temperature of the fuel pellets, increasing the risk of core melting under accident conditions

Method used

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  • On-line removal device for pressurized water reactor fuel assembly fission gas
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  • On-line removal device for pressurized water reactor fuel assembly fission gas

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032] In this embodiment, the PWR fuel assembly fission gas online removal device provided by the present invention includes a fuel assembly 1, an upper buffer container 2, a flow regulating valve 3, a loop circulation pump 4, a fission gas adsorption device 5, a helium gas Air supply device 6 and lower buffer container 7;

[0033] The upper part of the fuel assembly 1 is connected to the upper buffer container 2 by welding, and the upper buffer container 2 is provided with cooling fins 201, and the ou...

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Abstract

The invention provides an on-line removal device for pressurized water reactor fuel assembly fission gas. The device consists of a fuel assembly, an upper buffer container, a flow regulating valve, acirculation pump, a fission gas adsorption apparatus, a helium gas supply apparatus and a lower buffer container. The upper part of the fuel assembly is connected to the upper buffer container, the upper buffer container is connected to the flow regulating valve, the flow regulating valve is connected to the circulation pump, the circulation pump is connected to the fission gas adsorption apparatus, the fission gas adsorption apparatus is connected to the lower buffer container, the helium gas supply apparatus is connected between the fission gas adsorption apparatus and the lower buffer container, and the lower buffer container is connected to the bottom of the fuel assembly. In the pressurized water reactor running process, the on-line removal device provided by the invention can achieveon-line removal of fission gas generated in the fuel assembly, improve the thermal conductivity in the enclosure gap, reduce the neutron poison in the reactor running process, and enhance the economical efficiency of the reactor.

Description

technical field [0001] The invention relates to a pressurized water reactor fuel assembly, in particular to an online fission gas removal device for a pressurized water reactor fuel assembly. Background technique [0002] Fuel assemblies are an integral part of the reactor core. During the operation of the reactor, a large number of fission products are produced in the fuel rods that make up the fuel assembly, and these fission products mainly include inert gases, volatile iodine and cesium, and a small amount of semi-volatile and non-volatile nuclides. The fission gas in the fuel assembly has a great influence on the thermal conductivity of the fuel assembly. The thermal conductivity of krypton and xenon produced by fission is much smaller than that of the helium prefilled in the fuel assembly, which leads to the deterioration of the heat transfer performance of the fuel rod. The deterioration of the heat transfer performance of the fuel rods will lead to an increase in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C19/303
CPCG21C19/303Y02E30/30
Inventor 尹俊连董冰李磊豪王德忠
Owner SHANGHAI JIAO TONG UNIV
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