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Device and method for blocking an orifice of a tube wrapper of a steam generator of a nuclear reactor with pressurised water

A technology of steam generator and tube bundle sleeve, applied in the field of hole device, can solve the problems of difficulty in closing, difficult to introduce and install, etc.

Inactive Publication Date: 2008-10-29
FRAMATOME ANP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] After this cleaning, the bores formed on the tube bundle sleeves have to be closed, which presents many difficulties as the tube bundle sleeves are placed in and coaxial with the pressure casing
[0018] Another difficulty is that the inner hole formed in the tube bundle sleeve has substantially the same diameter as the outer hole formed in the pressure casing, which makes it difficult to introduce and install the means for closing the inner hole

Method used

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  • Device and method for blocking an orifice of a tube wrapper of a steam generator of a nuclear reactor with pressurised water
  • Device and method for blocking an orifice of a tube wrapper of a steam generator of a nuclear reactor with pressurised water
  • Device and method for blocking an orifice of a tube wrapper of a steam generator of a nuclear reactor with pressurised water

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Embodiment Construction

[0054] figure 1 The lower part of the steam generator of a pressurized water nuclear reactor, generally designated with reference numeral 1, is shown.

[0055] Generally, the steam generator 1 comprises a substantially cylindrical pressure housing 2 , in which a tube bundle sleeve 3 is arranged coaxially, which contains the tube bundle 4 of the steam generator 1 .

[0056] The tube bundle 4 consists of a very large number of tubes 5 bent into a U-shape, each tube comprising two straight branches joined at their ends and fixed into a tube sheet 6 which 6 is fixed to the lower part of the pressure casing of the steam generator 1. The pressure housing 2 is connected to a hemispherical bottom defining a two-thirds tank 7 .

[0057] At successive positions on the height of the pipe bundle, on the inner side of the pipe bundle sleeve 3, there are fixed pipe support plates 8 for holding the branches of the pipes 5 of the pipe bundle 4, so as to prevent the branches from working in ...

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Abstract

The invention relates to a device (20) for closing an inner hole of a control sleeve of a steam generator, comprising: a movable shaft (21) which comprises a pair of lower half flanges (25, 26); a pair of upper half flanges (27, 28) which can be rotated by 180 degrees by the shaft (21) between a low position and a high position, at the low position, the pair of upper half flanges, facing the lower half flanges (25, 26), are used for being introduced into the hole of the control sleeve of the steam generator, and at the high position, the pair of upper half flanges are opposite to the lower half flanges (25, 26); and a mechanism (22) for clamping the lower half flanges (25, 26) and the upper half flanges (27, 28) to the circumferential edge disposed at any side of the inner hole so as to close the inner hole. The invention also relates to a closing method and a tool for mounting and removing the closing device.

Description

technical field [0001] The invention relates to a device and a method for closing the holes of a tube bundle envelope of a steam generator of a pressurized water nuclear reactor. [0002] The invention also relates to a tool for installing or removing such a closing device. Background technique [0003] A pressurized water nuclear reactor comprises a steam generator which ensures heating and vaporization of the feed water by means of the heat delivered by the pressurized water cooling of the reactor core. Pressurized water reactors include on each of their main branches a steam generator having a main section in which the pressurized cooling water of the reactor circulates and an auxiliary section for receiving Feed water, which is gradually heated and vaporized and discharged from the auxiliary part of the steam generator in the form of steam, which is sent to a turbine connected to the nuclear reactor to drive an alternator for generating electric current. [0004] The s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21D1/00F22B37/00
CPCF22B1/025F22B37/002F22B37/223
Inventor O·西里尔J·卡帝诺特E·迪布瓦
Owner FRAMATOME ANP