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Device and method for underwater repair of a hole of a nuclear reactor part

A technology for nuclear reactors and repair methods, applied in the direction of reactor fuel elements, reactors, milling machine equipment, etc., can solve problems such as redundancy and damage

Pending Publication Date: 2018-10-23
FRAMATOME ANP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Replacing the headers is a relatively lengthy operation and may result in damage to other components of the assembly, such as the guide tube, which extends between the upper and lower headers and is provided to receive the Connections between control rod bundles in nuclear fuel assemblies or rods holding rods or guide tubes and sockets

Method used

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  • Device and method for underwater repair of a hole of a nuclear reactor part
  • Device and method for underwater repair of a hole of a nuclear reactor part
  • Device and method for underwater repair of a hole of a nuclear reactor part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] exist figure 1 In , a damaged nuclear fuel assembly 2 is placed underwater in a pool 4 of a nuclear power plant to be repaired using a repair system 6 .

[0044] The nuclear fuel assembly 2 comprises a bundle of elongated nuclear fuel rods 8 extending between a lower header 10 provided for placement on the lower core plate of a reactor in a nuclear power plant and an upper header 12, the upper tube The seat 12 is provided against the upper core plate of a reactor of a nuclear power plant. exist figure 1 In this case, the nuclear fuel assembly 2 is vertical, with the lower stem 10 at the bottom and the upper stem 12 at the top.

[0045] Conventionally, the top nozzle 12 includes a spring 14 provided against the top core plate in order to push the nuclear fuel assembly 2 downwards.

[0046] Such as figure 2 As shown, the upper nozzle 12 is provided with centering holes 16, each centering hole 16 being intended to receive a corresponding centering pin of the upper cor...

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Abstract

The invention relates to a repair device, which includes a holder (32), a cutting tool (22) held by the holder (32) and having at least one cutting tooth (70) for re-machining an inner surface of thehole, the cutting tool (22) having a suction channel (44) extending into the cutting tool (22) between at least one inlet opening (46) and at least one outlet opening (48), a drive shaft (34) for rotating the cutting tool (22), the drive shaft (34) being held by the holder (32), and a suction tube (36) connected to the holder (32) and fluidly coupled to the outlet opening (48) of the suction channel (44).

Description

【Technical field】 [0001] The invention relates to the field of underwater repair of holes in nuclear reactor components, in particular upper nozzles of nuclear fuel assemblies. 【Background technique】 [0002] A nuclear reactor includes a reactor core made up of a plurality of nuclear fuel assemblies arranged side by side between an upper core plate and a lower core plate. [0003] Each nuclear fuel assembly includes a bundle of nuclear fuel rods extending between a lower nozzle, the nuclear fuel assembly rests on the core lower plate, and an upper nozzle, the nuclear fuel assembly rests on the core upper plate. [0004] For lateral positioning of the nuclear fuel assemblies, centering holes may be located on the upper surface of the upper stem and / or on the lower surface of the lower stem of each nuclear fuel assembly. [0005] They are intended to receive centering pins positioned on the lower surface of the upper core plate of the nuclear reactor, respectively on the uppe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/04B23C3/00G21C3/30G21C19/02G21C3/334G21C3/33G21C5/06
CPCG21C3/3315G21C3/334G21C5/06G21C19/02B23D75/00Y02E30/30B23D77/14Y10T408/50B23D2277/28
Inventor 赛日·罗耶朱立安·瓦莱罗
Owner FRAMATOME ANP
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