Method and device for measuring inner wall temperature of nuclear power station pipeline

Abstract

The invention discloses a method for measuring the inner wall temperature of a nuclear power station pipeline. The method comprises steps of establishing a unit transient heat transfer model; deriving a numerical computation method using the unit transient heat transfer model; measuring the outer wall temperature of a pipeline; and taking the measured outer wall temperature of the pipeline as a known quantity, and using the numerical computation method to obtain the inner wall temperature of the pipeline. Compared with the prior art, the invention has no requirement of drilling a hole in a tested pipeline, accurately masters temperature distribution information of the inner wall of the pipeline under a precondition that the structure of the primary loop pipeline (containing a radiative fluid) of a nuclear power station is not destroyed, achieves radioactivity containment more effectively, and improves operation security of the nuclear power station. Meanwhile, the outer wall temperature of the pipeline is directly measured instead of the temperature of a fluid in the pipeline, and thus computation of a heat transfer coefficient is omitted, and the computation accuracy of the pipe wall temperature field is obviously improved. In addition, the invention also discloses a device for measuring the inner wall temperature of the nuclear power station pipeline.

Description

technical field [0001] The invention belongs to the field of temperature measurement of nuclear power plants. More specifically, the invention relates to a method and device for measuring the temperature of the inner wall of a nuclear power plant pipeline. Background technique [0002] In the theoretical system of nuclear power plant aging and life management, the supervision and monitoring results of key equipment aging degradation are the basis for subsequent evaluation of equipment aging status and equipment life. The main aging mechanisms of key equipment in nuclear power plants include fatigue, corrosion, wear, radiation embrittlement, and thermal aging, among which fatigue is one of the most important reasons for the failure of key equipment in nuclear power plants. At present, a series of incidents caused by reactor coolant pipeline fatigue have occurred in nuclear power plants around the world. These events have affected the safe and economical operation of nuclear p...

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Problems solved by technology

However, this method has obvious defects both in terms of safety and accuracy: on the one hand, holes are opened in the pipe to be tested, which makes the stress concentration generated by the pipe increase the probability of initial defects in the pipe wall, which It will affect the mechanical properties of the high-energy pipeline on the primary side of the nuclear power plant, and even cause the pipeline to break in severe cases; The determined parameters seriously affect the calculation accuracy of the pipe wall temperature field

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