Pressurized water reactor nuclear power plant steam generator data assimilation method and system

Abstract

The invention discloses a pressurized water reactor nuclear power plant steam generator data assimilation method and system. The method comprises: analyzing parameter sensitivity of a nuclear power plant steam generator simulation model; simulating a data acquisition process of a real nuclear power plant steam generator in an actual operation process or directly acquiring an actual observation value of a nuclear power plant; arranging and evaluating the parameters of the nuclear power plant steam generator simulation model according to the sensitivity indexes, and fitting a mapping relation between the parameters to be assimilated and the output of the nuclear power plant steam generator simulation model through a polynomial to serve as an observation operator; establishing an uncertainty database; and constructing a cost function by using the uncertainty database and the actual observation value, calculating the cost function by using a genetic algorithm to obtain an optimized parameter to be assimilated, substituting the optimized parameter into the steam generator simulation model, and implementing data assimilation when the output water level of the steam generator simulation model reaches convergence precision. Maintenance and operation of the steam generator are facilitated.

Description

technical field [0001] The invention belongs to the technical field of reactor engineering, in particular to a data assimilation method and system for a steam generator in a pressurized water reactor nuclear power plant. Background technique [0002] The development of nuclear reactor technology provides a reliable solution for human beings to obtain clean and efficient energy. In a pressurized water reactor nuclear power plant, the steam generator is an energy conversion device connecting the primary circuit and the secondary circuit, and its safe operation is very important to the nuclear power plant. The steam generator simulation model is an important method to understand the thermal-hydraulic dynamic characteristics of the steam generator, and has been widely used in the study of steam generator characteristics and water level regulation. [0003] The uncertainties in the steam generator simulation model can be summarized as follows: the structure of the existing steam...

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Problems solved by technology

At the same time, the model parameters of the steam generator simulation model are complex and diverse, and have the characteristics of strong coupling and nonlinearity

Therefore, the manual adjustment of model parameters based on expert experience often cannot reflect the actual changes of model parameters in the steam generator simulation model.

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