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

Water-soluble coating composition for surface protection of nuclear fuel rod

A technology for nuclear fuel rods and coating agents, which is applied in the fields of reactor fuel elements, coatings, nuclear engineering, etc., can solve the problems of lack of alternative substances, unavoidable environmental pollution, fragility, etc., and achieves easy removal, improved working environment and operation. The effect of improving safety and operational safety

Inactive Publication Date: 2016-08-03
KEPCO NUCLEAR FUEL CO LTD
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, nitrocellulose (NC), currently used as a paint substance, is a derivative of natural high-molecular cellulose in a white powder state, and is difficult to handle due to explosive combustion properties that can be used as the main raw material of gunpowder
Moreover, when the solvent evaporates, although a strong film will be formed, the formed film is very brittle, so it is necessary to add plasticizers, alkyd resins, etc. to form a film with appropriate hardness and flexibility
Moreover, in order to have fluidity suitable for use, it is used by dissolving it in an organic solvent, so it is difficult to avoid environmental pollution caused by the organic solvent
[0004] Therefore, the necessity of developing safer and harmless paint substitutes has been recognized, and research has been conducted on them, but no suitable substitutes have been found during this period, so organic solvent-based paints have been used so far
[0005] In particular, it is known that foreign companies such as Westinghouse and Areva do not have a painting process for preventing scratches on the surface of nuclear fuel rods and a depainting process for removing coatings after loading fuel rods. Similar to the process, there is still a lack of technical development and invention achievements for water-soluble coating agents that are loaded into fuel rods without a coating film or loaded by sprinkling water.

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
  • Water-soluble coating composition for surface protection of nuclear fuel rod
  • Water-soluble coating composition for surface protection of nuclear fuel rod
  • Water-soluble coating composition for surface protection of nuclear fuel rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1. Preparation of water-soluble coating agent composition

[0046] Next, a method for preparing a water-soluble coating composition for coating the surface of a nuclear fuel rod will be described.

[0047] As a polymer resin, the weight ratio of methacrylic acid (MAA) is 5.4%, the weight ratio of 2-hydroxyethyl methacrylate (2-HEMA) is 2.7%, and the weight ratio of methyl methacrylate (MMA) The ratio is 0.9%, and the weight ratio of the whole polymer resin obtained after adding them is 9.0%, and the weight ratio of the polymer resin dissolved in isopropyl alcohol (IPA) is 28.0%, and the weight ratio of ethanol (EtOH) is 50.0%. %, and a solvent in which the weight ratio of water is 13.1%, thereby preparing a coating agent composition. This coating agent composition is called YS-3 coating agent composition. Coating agent compositions similar to the YS-3 coating agent composition were prepared and tested. The polymer resin and solvent compositions of each coat...

Embodiment 2

[0051] Example 2. Evaluation of Physical Properties of Coated Films of Water-Soluble Coating Agent Compositions

[0052] A water-soluble coating agent was used to form a coating film on a flat test piece made of the same material as the fuel rod, and after drying, the pencil hardness was measured using a pencil hardness tester. The thickness of the applied coating film was measured using a light reflection type coating film thickness meter. The thickness of the coating film is measured with a coating film thickness meter, and the coating film to be measured is placed under a light source, and the thickness in μm is measured by measuring the amount of light reflected by irradiation with near-infrared rays.

[0053] The adhesive strength evaluation test method was implemented as follows. After coating the coating agent on a flat plate with a size of 10×10 cm according to the type, cut off the coating film with a knife, remove it with an adhesive tape, and compare and evaluate b...

Embodiment 3

[0060] Example 3. Evaluation of Coating Agent Composition Using Fuel Rod Loading Test Device

[0061] In order to apply the water-soluble coating agent to actual fuel rods, a small-scale fuel rod loading test device was fabricated to measure the load at the time of loading and the depth and width of the scratches on the fuel rods, thereby evaluating the water-soluble coating agent and the fuel rod. Comparative evaluation of existing paint (NC) coating agents.

[0062] The device for the fuel rod loading test was prepared in the following configuration. The frame with a size of about 4 m actually used for loading fuel rods was reduced to 1.5 m, so that the manufactured fuel rod loading test device had three spacer grids (SpacerGrid) that could be loaded with fuel rods. , vertical, each 17, a total of 289 grid cells (GridCell) can be loaded into the structure of 264 fuel rods except the guide thimble tube (GuideThimbleTube, 24) and instrumentation tube (InstrumentationTube, 1)....

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
ignition pointaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

Disclosed is a water-soluble coating composition, which is applied on the surface of fuel rods to prevent scratching of the surface of the fuel rods upon manufacturing a nuclear fuel assembly for light water reactors. This water-soluble coating composition facilitates the formation and removal of a coating film and the resulting coating film can exhibit strength and durability equivalent to those of an existing lacquer (nitrocellulose) coating film, and can thus be used as an alternative to lacquer, thereby easily removing the coating film and improving workplace safety, ultimately achieving improvements in the working environment and high workplace safety.

Description

technical field [0001] The present invention relates to a water-soluble coating agent, which is coated on the surface of nuclear fuel rods in order to prevent scratches on the surface of nuclear fuel rods located in nuclear fuel assemblies for light water reactors. More specifically, it relates to a A composition for a water-soluble coating agent that is easy to form and remove a coating film and is used to prepare a water-soluble coating film that does not differ in strength and durability from conventional lacquer coating films. Background technique [0002] In order to prepare nuclear fuel assemblies for light water reactors, the fuel rods are loaded into the frame (Skeleton). Painted on the surface. At present, the paint used in the coating process of nuclear fuel rods is Nitrocellulose paint. Nitrocellulose is a paint that forms a protective coating film while the solvent evaporates. It not only dries quickly, but also forms a tough and strong film. Then, the coating ...

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 Applications(China)
IPC IPC(8): C09D133/02C09D133/14C08F220/06C08F220/28C08F212/08C08F220/14C08F220/58
CPCG21C3/07G21C21/02C09D133/066C08L2201/54G21F1/10Y02E30/30C09D133/02C09D133/12C09D135/02
Inventor 洪钟承韩相材吴明浩孔相弼朴成俊申恩雨辛贵寅李义载
Owner KEPCO NUCLEAR FUEL 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