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

Loading method for MOX fuel assemblies axially arranged in multiple zones

A fuel assembly and multi-partition technology, applied in the direction of reactor fuel elements, nuclear reaction control, nuclear power generation, etc., can solve the problem of core axial power offset downwards, achieve the effect of improving performance and axial power distribution

Inactive Publication Date: 2017-01-04
CHINA NUCLEAR POWER ENG CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a MOX fuel assembly loading method with axial multi-section arrangement for the problem that the core axial power of the current pressurized water reactor fully loaded with MOX fuel is very serious downward deviation

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
  • Loading method for MOX fuel assemblies axially arranged in multiple zones
  • Loading method for MOX fuel assemblies axially arranged in multiple zones
  • Loading method for MOX fuel assemblies axially arranged in multiple zones

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] The MOX fuel assembly loading method provided by the present invention divides the MOX fuel assembly axially into multiple partitions, and the content of Pu in each partition is different. The principle of zoning is to arrange the axial power distribution diagram of the core at the beginning of life according to the axial non-zoning arrangement of components, as shown in figure 1 As shown, from the axial power distribution, it can be seen that the downward power shift is very serious, so it is necessary to increase the content of fuel pellets Pu in the upper part of the assembly and reduce the content of fuel pellets Pu in the lower part of the assembly to increase the upper part of the core. To reduce the power axial offset, but at the same time, it is necessary to avoid the resulting positive axial power offset at the beginning of the fuel cy...

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

PropertyMeasurementUnit
Heightaaaaaaaaaa
Login to View More

Abstract

The invention relates to a loading method for MOX fuel assemblies axially arranged in multiple zones. The MOX fuel assemblies are arranged in multiple zones in the axial direction, the Pu content in each zone is subjected to loading design, the Pu content of fuel pellets in the upper zones of the assemblies is increased, and the Pu content of fuel pellets in the lower zones of the assemblies is decreased, so that it is guaranteed that the average Pu content of the assemblies meets design requirements, and meanwhile it is avoided that positive axial power offset at the beginning of the fuel cycle life is caused when the average Pu content does not meet design requirements. On the basis that the axial power offset is relieved, the fewest types of Pu content fuel pellets are adopted to achieve axial loading design of the MOX fuel assemblies.

Description

technical field [0001] The invention belongs to the MOX fuel loading technology of the pressurized water reactor core, and in particular relates to a loading method of the MOX fuel assembly arranged in multiple sections in the axial direction. Background technique [0002] Compared to UO 2 The PWR core composed of fuel assemblies, in the PWR core loaded with MOX fuel, due to the axial change of moderator density and the larger absorption cross section of MOX fuel, the axial energy spectrum of the core difference compared to UO 2 The core composed of fuel is large, which leads to a large axial power shift of the core, which is not conducive to flattening the core power peak factor, is not conducive to core control, and is not conducive to the safe operation of the core. Therefore, it is necessary to The MOX fuel assembly has a new design to improve the axial power offset of the core and ensure the safe operation of the core. Contents of the invention [0003] The object ...

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
IPC IPC(8): G21C3/326
CPCG21C3/326G21C3/3267Y02E30/30
Inventor 郭治鹏霍小东刘国明杨海峰
Owner CHINA NUCLEAR POWER ENG CO LTD
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