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Supercritical water cooled reactor fuel assembly and reactor core

A technology of fuel assembly and water-cooled reactor, which is applied to fuel elements, greenhouse gas reduction, nuclear power generation, etc. It can solve the problems of difficult manufacturing, high manufacturing cost, and large radial size, and achieve the solution of increased flow-induced vibration and reduced manufacturing Difficulty and manufacturing size, effect of size reduction

Inactive Publication Date: 2013-10-23
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention also provides a supercritical water-cooled reactor single-flow core to overcome the problems of complex structure, large radial size, high manufacturing cost, high manufacturing difficulty, and serious flow-induced vibration caused by the use of multiple processes in the existing core.

Method used

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  • Supercritical water cooled reactor fuel assembly and reactor core
  • Supercritical water cooled reactor fuel assembly and reactor core
  • Supercritical water cooled reactor fuel assembly and reactor core

Examples

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Embodiment 1

[0039] Such as figure 1 and figure 2 As shown, a supercritical water-cooled reactor fuel assembly includes a shell assembly and a core body arranged in the shell assembly, and an air cavity 15 is arranged in the middle of the core body. The fuel assembly is divided into upper and lower parts. The upper shell assembly includes an upper assembly box 1 , an upper moderator box 2 and an upper casing 4 . The upper moderator box 2 is arranged inside the upper assembly box 1 , and the upper core 3 is wrapped by the upper cladding 4 and evenly arranged between the upper moderator box 2 and the upper assembly box 1 . The lower housing assembly includes a lower assembly box 5 , a lower moderator box 6 and a lower cladding 8 . The lower moderator box 6 is arranged inside the lower component box 5 , and the lower core 7 is wrapped by the lower cladding 8 and evenly arranged between the lower moderator box 6 and the lower component box 5 . The upper shell assembly is made of nickel-ba...

Embodiment 2

[0047] Such as figure 1 As shown, this embodiment is based on Embodiment 1, the upper shell assembly is made of Inconel718 alloy, and the upper core 3 235 U enrichment degree is 6.2%, the lower core body 7 235 U enrichment is 2.5%. When the existing fuel assembly is made of Inconel718 alloy, the core body 235 The U enrichment is usually 6.2% to obtain the infinite proliferation factor (Kinf) required by the supercritical water-cooled reactor (the infinite proliferation factor characterizes the ratio of neutron production rate to neutron disappearance rate in an infinite system). In order to obtain the same infinite growth factor as the existing fuel assembly in this embodiment, the lower core 7 235 U enrichment was set at 2.5%. Due to the unfavorable neutron absorption of zirconium alloy, 2.5% 235 The U enrichment degree can be achieved with 6.2% when using Inconel718 alloy 235 U immortalization factor with the same enrichment.

[0048] The characteristics of this embod...

Embodiment 3

[0050] Such as figure 1 As shown, this embodiment is based on Embodiment 1, the upper shell assembly is made of 310S steel, and the upper core 3 235 U enrichment degree is 5.6%, the lower core body 7 235 U enrichment is 2.5%. When the existing fuel assembly is made of 310S steel, the core body 235 U enrichment is usually 5.6%, in order to obtain the unlimited proliferation factor required by supercritical water-cooled reactors. In order to obtain the same infinite growth factor as the existing fuel assembly in this embodiment, the lower core 7 235 U enrichment was set at 2.5%. Due to the unfavorable neutron absorption of zirconium alloy, 2.5% 235 U enrichment can be achieved and 5.6% when using 310S steel 235 U immortalization factor with the same enrichment.

[0051] The characteristics of this embodiment are: in reducing 235 In the case of U loading, a supercritical water-cooled reactor fuel assembly having the same geometrical dimensions and heating efficiency as th...

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Abstract

The invention discloses a supercritical water cooled reactor fuel assembly which comprises a shell assembly and a core body arranged inside the shell assembly and is characterized in that the fuel assembly is divided into an upper part and a lower part; the upper shell assembly is made of nickel base alloy or stainless steel and the lower shell assembly is made of zirconium alloy; and 235U enrichment degree of the upper core body is greater than 235U enrichment degree of the lower core body. The invention also discloses a supercritical water cooled reactor single-path reactor core. The invention has advantages as follows: packing volume of 235U is reduced and economical efficiency is high; complexity of the reactor core structure is decreased and the flow induced vibration increasing problem caused by a multipath structure is also solved; and it is beneficial to structural integrity of the fuel assembly.

Description

technical field [0001] The invention relates to the field of nuclear industry, in particular to a fuel assembly of a supercritical water-cooled reactor and a single-flow core of a supercritical water-cooled reactor. Background technique [0002] Supercritical water-cooled reactor (SCWR) is a fourth-generation nuclear energy system that has developed relatively rapidly in recent years. It has outstanding advantages such as high unit thermal efficiency and simplified system. Its thermal efficiency is as high as about 44%, and it has great advantages over other reactors in terms of economy. [0003] In order to improve its thermal efficiency, the supercritical water-cooled reactor adopts a higher core outlet temperature (about 500 ℃), and a larger core inlet and outlet temperature difference (about 220 ℃), and the mass flow rate of the coolant is about that of the pressurized water reactor. 1 / 10. Supercritical water-cooled reactors face two very prominent problems during cons...

Claims

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Application Information

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IPC IPC(8): G21C3/22G21C3/04
CPCY02E30/40Y02E30/30
Inventor 李庆王连杰张知竹杨平夏榜样于颖锐李翔李妍
Owner NUCLEAR POWER INSTITUTE OF CHINA
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