Method for soft measurement of nuclear power station reactor core temperature fields on basis of neutral network surface fitting

Abstract

The invention discloses a method for soft measurement of nuclear power station reactor core temperature fields on the basis of neutral network surface fitting. The method comprises the following steps of: establishing a reactor core temperature calculation model through researching a reactor core channel model, a reactor core segment division and power distribution model, a reactor core coolant flow distribution model and a reactor core heat conduction and transmission model; carrying out preliminary reconstruction on a two-dimensional temperature field at the section of a pressurized water reactor core coolant outlet by utilizing a radial basis function (RBF) neutral network surface fitting method on the basis of discrete temperature data of the coolant outlet; calculating the flow of each coolant channel by utilizing a heat transfer formula; and finally substituting the calculated outlet temperature and channel flows into a reactor core temperature calculation model to realize the soft measurement of three-dimensional temperature distribution of a reactor core coolant and a reactor core fuel assembly. According to the method disclosed by the invention, safety guidance can be provided for reactor core design, a coolant temperature distribution law can be analyzed by utilizing a calculation model, and reference can be provided for reactor core structure design parameters.

Description

technical field [0001] The invention belongs to the technical field of thermal measurement, in particular to a soft measurement method for nuclear power plant core temperature field based on neural network surface fitting. Background technique [0002] In recent years, non-fossil energy has gradually replaced the role of fossil energy by virtue of its clean and renewable advantages, which is also the trend of future energy development. Relying on its environmental and economic advantages, nuclear energy has gradually become a clean energy recognized by the energy industry. my country's nuclear power development has a history of nearly 40 years. In the long run, nuclear power is an indispensable part of gradually reducing environmental pollution and improving my country's energy structure. [0003] The continuous development of nuclear energy also makes people have higher and higher requirements for effective control and safety control of nuclear power plants. As a basic an...

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Problems solved by technology

However, due to the high temperature and high pressure environment during the operation of reactors and the structural characteristics of these devices, it is difficult to measure the temperature inside them.

Although the current measurement technology is developing rapidly and can measure the temperature of certain points, it is difficult to obtain the internal temperature distribution of the entire furnace or reactor. Therefore, we need to reconstruct the temperature field

[0004] Although a lot of work has been done on reactor core temperature measurement methods and temperature field reconstruction at home and abroad, certain results have been achieved: domestic scholars have proposed a reconstruction algorithm based on the algebraic reconstruction method (ART), which uses a small number of data to simulate and reconstruct typical temperature The field model has achieved good results, but the solution of this method requires multiple iterations, and the real-time performance of the algorithm cannot be guaranteed

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