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Method for manufacturing nuclear reactor fuel assembly

A technology for nuclear reactor fuel and fuel assembly, applied in the field of nuclear power

Pending Publication Date: 2021-07-23
PUBLICHNOE AKTSIONERNOE OBSHCHESTVO NOVOSIBIRSKY ZAVOD KHIMKONTSENTRATOV (PAO NZHK)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Violations not excluded - tearing of the varnish coating, resulting in the formation of wear marks exceeding 30 microns

Method used

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Examples

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Embodiment Construction

[0011] A method of manufacturing a fuel assembly for a nuclear reactor is carried out as follows.

[0012] The fuel elements are long tubes, mostly made of zirconium alloy, sealed at both ends, pre-filled with fuel chips. After performing all control operations, the heat removal elements are collected in a bundle. A bundle is a set of fuel elements designed to assemble a single cartridge. Install the heat removal element in the intra-operative box and move to the heat release element assembly rack. The operation of assembling the fuel elements on the jig is performed by pushing the fuel elements. The fuel element moves horizontally along its own axis through the pushing mechanism. This process passes through the protective coating of the device and the spacing of the grid cells. The fuel elements thus fall into the frame of the fuel assembly. As means for applying the protective coating, for example, a mold can be used. The inner surface of the die is lined with a poroel...

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Abstract

The invention relates to nuclear energy and can find application in enterprises involved in manufacturing fuel assemblies, primarily for water-cooled nuclear energy reactors and nuclear energy reactors with a liquid-metal coolant. The essence of the invention: in a method for assembling fuel elements into fuel assemblies which includes the following operations of manufacturing and monitoring fuel elements, applying a protective coating to each fuel element, assembling the prepared fuel elements into a fuel assembly, attaching a head section and a tail section, washing off the protective coating and drying, the operations of applying the protective coating and assembling the fuel elements into the fuel assembly are combined, using as the protective coating a water-soluble lubricant which contains oxyethylated alkylphenol and monobasic unsaturated fatty acids and which is applied to the surface of the fuel element on the assembly stand during the operation of assembling the fuel elements into the fuel element assembly, the fuel element being transferred in a horizontal direction along its own axis into spacer grid cells through a device for applying the protective coating which is installed on the assembly stand. The operation of washing off the protective coating is carried out using streams of pressurized, room-temperature water.

Description

technical field [0001] The invention relates to nuclear power, and can be used in enterprises manufacturing fuel assemblies, mainly for water-water and liquid-metal coolant nuclear power reactors. Background technique [0002] It is known that the process of manufacturing fuel assemblies includes the operation of installing fuel elements ready for assembly by pushing through spaced grids of coaxial cells mounted parallel to each other. Together with the guide channels, the spacer grid forms the framework of the fuel assembly (cf. B.A. Dementiev. Nuclear Reactor-M., Energoatomizdat, 1990, pp. 42-44). Fuel elements are the most responsible and stressed structural elements in the nuclear reactor core. The tightness of the casing of the fuel elements and their reliable fixation in the frame during the fuel assembly - this is what ensures the reliability and safety of the operation of the fuel assembly and the reactor. [0003] Zirconium alloys from which heat release element h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C21/02
CPCG21C21/02Y02E30/30G21C3/334G21C3/06G21C3/07G21C3/20
Inventor E·V·尤金娜E·G·泽伦科夫A·V·斯特鲁科夫S·A·布伊莫夫A·S·特鲁斯蒂伊R·F·穆斯塔费夫
Owner PUBLICHNOE AKTSIONERNOE OBSHCHESTVO NOVOSIBIRSKY ZAVOD KHIMKONTSENTRATOV (PAO NZHK)
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