Single-flow supercritical water cooled reactor based on square fuel assemby

A fuel assembly and square technology, applied in the field of nuclear reactors, can solve problems such as the complexity of fuel assembly and core structure, and the reduction of engineering feasibility, so as to improve outlet temperature and safety, improve engineering feasibility, and improve fuel economy sexual effect

Active Publication Date: 2020-02-28
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the main problems faced in the design of fuel assemblies and cores are: in order to achieve sufficient and uniform moderation of each fuel rod in the fuel assembly, multiple "water rods" must be arranged evenly; For the process coolant to be effectively divided inside the core, a special structure for high and low temperature fluid isolation must be installed on the upper and lower ends of the fuel assembly and in the reactor. Although the above design method ensures fuel economy, safety and technical indicators, the fuel assembly and the core The structure tends to become more complex, and the engineering feasibility is greatly reduced

Method used

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  • Single-flow supercritical water cooled reactor based on square fuel assemby
  • Single-flow supercritical water cooled reactor based on square fuel assemby
  • Single-flow supercritical water cooled reactor based on square fuel assemby

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Embodiment 1

[0029] This embodiment provides a square fuel assembly, in which a guide tube 1 is coaxially arranged at the center of the square fuel assembly, and a control rod bundle 4 is coaxially arranged in the guide tube 1; at the four corners and the periphery of the square fuel assembly One support tube 2 is coaxially arranged at the center points of the four sides in the circumferential direction, a total of 8 support tubes 2; 256 fuel rods 3 are coaxially arranged between the dead plate and the center of the square fuel assembly.

[0030] The outer diameter of each fuel rod 3 is 9.5mm, the wall thickness is 0.65mm, and the cladding material is SiC; the core body is UO 2 ceramics, the outer diameter of the core is 8.0 mm; the center-to-center distance between adjacent fuel rods 3 is 10.5 mm, which is used as a coolant flow channel. The cladding material of the fuel rod 3 is silicon carbide.

[0031]The guide tube 1 occupies 25 grid positions at the center of the square fuel assembl...

Embodiment 2

[0036] This embodiment provides a single-flow supercritical water-cooled reactor, which includes 293 square channels 7, and the 293 square channels 7 are adjacent to each other to form a honeycomb integral structure, and a metal reflective layer 8 is arranged outside the honeycomb integral structure; the square channel 7 For accommodating the square fuel assembly provided in Embodiment 2, the inner side of the metal reflective layer 8 is an irregular polygonal structure that is in contact with the outer side of the honeycomb monolithic structure.

[0037] The wall thickness of the square channel 7 is 2.0mm, the center-to-center distance between adjacent square channels 7 is 182.0mm, the structural material is stainless steel, and the circumscribed circle diameter of the honeycomb integral structure core is 3686mm; the outer diameter of the metal reflective layer 8 is 3790mm The outer diameter of the hanging basket 10 is 3850mm, and the wall thickness of the hanging basket 10 is...

Embodiment 3

[0040] Based on the single-flow supercritical water-cooled reactor fuel management method provided in Embodiment 2:

[0041] In this embodiment, a coolant flow distributor 9 is provided at the bottom of each square channel 7 in the core. According to the location of the square channel 7 in the core, the layout of the core control rods and the three-dimensional power distribution shape of the core, each square The coolant flow in channel 7 is regulated.

[0042] According to the core power, height and other parameters, the fuel management method of multi-batch refueling is adopted, that is, multiple boxes of square fuel assemblies are arranged in each square channel 7 of the core, the coolant adopts a single-flow flow scheme, and the coolant in each square channel 7 The flow rate is fixed, which greatly improves the feasibility of the project. The coolant density at the bottom of the core is high and the coolant density at the top is low. New fuel assemblies enter from the top...

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Abstract

The invention discloses a square fuel assembly. According to the square fuel assembly, a guide pipe is coaxially arranged at the center of the square fuel assembly, and a control rod bundle is coaxially arranged in the guide pipe; supporting pipes are coaxially arranged at the four corners of the square fuel assembly and the center points of the four peripheral edges of the square fuel assembly; aplurality of fuel rods are coaxially arranged between a stiff plate and the center of the square fuel assembly. The invention discloses a single-flow supercritical water cooled reactor based on the square fuel assembly. The single-flow supercritical water cooled reactor based on the square fuel assembly comprises a plurality of square channels, the square channels are arranged to be adjacent to one another to form a honeycomb integral structure, and a metal reflecting layer is arranged outside the honeycomb integral structure; the square channels are used for containing the square fuel assemblies. Under the condition of meeting neutron economy, safety and engineering realizability, the design of fuel assemblies of water rods can be canceled, the design of a single-flow reactor core is realized, and the improvement of the economical benefit of fuel management is facilitated.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a single-flow supercritical water-cooled reactor based on square fuel assemblies. Background technique [0002] Supercritical water-cooled reactor (SCWR) is one of the six most promising nuclear energy systems selected by the Generation IV Nuclear Energy International Forum (GIF). SCWR is a high-temperature, high-pressure water-cooled reactor whose coolant outlet parameters are above the thermodynamic critical point of water. Compared with conventional pressurized water reactors, the thermal efficiency of SCWR can reach more than 45%, and it makes full use of the technical achievements of existing supercritical thermal power units. Due to the high water vapor parameters, the system can be greatly simplified by using direct circulation. SCWR has no DNB phenomenon, and the fuel cladding is made of stainless steel, which completely eliminates the potential risk of hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/07G21C3/322G21C3/326G21C3/336G21C3/356
CPCG21C3/07G21C3/322G21C3/336G21C3/356G21C3/3267Y02E30/30
Inventor 夏榜样李司南姚磊卢迪肖鹏甯忠豪王连杰李庆李翔李松蔚李文杰
Owner NUCLEAR POWER INSTITUTE OF CHINA
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