Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A single-flow supercritical water-cooled reactor based on square fuel assemblies

A fuel assembly and square technology, applied in the field of nuclear reactors, can solve the problems of reduced engineering feasibility, complex fuel assembly and core structure, etc., and achieve the effect of improving economy

Active Publication Date: 2021-07-13
NUCLEAR POWER INSTITUTE OF CHINA
View PDF9 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A single-flow supercritical water-cooled reactor based on square fuel assemblies
  • A single-flow supercritical water-cooled reactor based on square fuel assemblies
  • A single-flow supercritical water-cooled reactor based on square fuel assemblies

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a square fuel assembly. A guide tube is coaxially arranged at the center of the square fuel assembly, and a control rod bundle is arranged coaxially in the guide tube; at the four corners of the square fuel assembly and at the central points of the four peripheral sides Support pipes are coaxially arranged; several fuel rods are coaxially arranged between the dead plate and the center of the square fuel assembly. A single-flow supercritical water-cooled reactor based on the above-mentioned square fuel assembly, including several square passages, the several square passages are adjacent to each other and form a honeycomb integral structure, and a metal reflective layer is arranged outside the honeycomb integral structure; the square passages are used to accommodate Square fuel assembly. Under the conditions of satisfying neutron economy, safety and engineering realizability, the invention can cancel the fuel assembly design of "water rods" and realize single-flow core design, which is beneficial to improve the economy of fuel management.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com