Reactor pressure vessel main sealing surface measuring device

Abstract

The invention belongs to the field of nuclear power station reactor maintenance, and particularly relates to a reactor pressure vessel main sealing surface measuring device which comprises a measuringinstrument, a measuring instrument fixing rod, a locking nut, a telescopic measuring meter head and a supporting seat; the bottom of the measuring instrument is connected with a telescopic measuringmeter head; the measuring instrument is fixedly connected to the upper part of the measuring instrument fixing rod; the locking nut is arranged on the supporting seat in a sleeving manner, and the locking nut is adjustably connected with the supporting seat; the lower portion of the measuring instrument fixing rod is arranged in the supporting base, the measuring instrument fixing rod is fixedly connected with the supporting seat through the locking nut, and the telescopic measuring meter head extends out of the bottom of the supporting seat. According to the device, stable clamping of the measuring instrument is achieved, a fixing rod of the measuring instrument is not damaged, and the accuracy of a measuring result is guaranteed.

Description

technical field [0001] The invention belongs to the field of nuclear power plant reactor maintenance, and in particular relates to a measuring device for the main sealing surface of a reactor pressure vessel. Background technique [0002] The first phase of Tianwan Nuclear Power Plant consists of two VVER-1000 units, and the reactor is a B-428 reactor. The reactor pressure vessel is an important part of the reactor, which is used to accommodate the reactor internals, core components (such as fuel assemblies, control rod assemblies and burnable poison assemblies) and other related components (gauge instruments, etc.). The reactor pressure vessel is the primary circuit coolant pressure boundary and the third barrier to prevent fission products from escaping. Its design pressure is 17.64MPa, design temperature is 350℃, and hydraulic test pressure is 24.5MPa. The main seal of the reactor pressure vessel is completed by the combination of the pressure vessel top cover and the pr...

AI Technical Summary

Problems solved by technology

The measurement position cannot be observed when the traditional measuring device clamps the measuring instrument, and the measurement position is judged only by human estimation and the detection of the measuring instrument

The measurement instrument has a large error in the measurement result due to the inability to accurately detect the indentation position, and there are many uncertain factors in the artificial estimation of the measurement position

Therefore, the traditionally used measuring device clamping measuring instrument cannot meet the above key dimension measurement requirements

[0005] In addition, there are risks of high temperature, high radiation and foreign objects in the working environment when measuring the above-mentioned critical dimensions. Traditionally used measuring devices take a long time to measure and consume a lot of physical strength

[0006] Therefore, it is urgent to develop a measuring device for the main sealing surface of the reactor pressure vessel, which can effectively overcome the disadvantages and risks of the above-mentioned measurements.

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