Optimization method of CANDU reactor refueling scheme based on mixed integer programming and linear programming

Abstract

The invention discloses a method for optimizing the refueling scheme by utilizing an integer-linearity mixed programming. The problem is solved by two steps including: step one, giving consideration to the aftereffect of channel refueling, establishing a candidate channel selection model aiming at the least number of the refueling channels, continuously optimizing the refueling scheme for 16 weeks; and step two, providing a weekly refueling plan firstly by physics engineers of the reactor based on the running requirements of the reactor in the next week, then establishing a weekly refueling scheme optimization model aiming at the deepest average unloading burn-up, and synchronously adding corresponding restraint conditions into the model by giving consideration to various requirements for the running of the reactor. Considering the timeliness of designing the refueling scheme, a three-dimensional reactor core calculation model, i.e., a linearity sensitive matrix method, is provided for evaluating a mass of refueling schemes. The responses of the reactor core key parameters during the channel refueling can be quickly and precisely estimated, accordingly achieving quick evaluations to a mass of refueling schemes.

Description

technical field [0001] The patent of the invention belongs to the field of design and optimization of the refueling scheme of the CANDU reactor nuclear power plant, and specifically relates to a method for optimizing the refueling scheme of the CANDU reactor based on mixed integer programming linear programming. Background technique [0002] The CANDU 6 heavy water reactor has a total of 380 fuel channels. Unlike reactors that use shutdown to refuel (such as pressurized water reactors), the CANDU reactor adopts an online refueling method. When operating at full power, an average of two fuels are replaced per day. aisle. The design of the daily refueling plan is completed by the power plant reactor physics engineer, usually every 3 to 4 days, and 6 to 7 fuel channels are selected from 380 fuel channels each time and submitted to the operator for replacement. The design of CANDU refueling scheme is a complex multi-objective and multi-constrained optimization problem. A good r...

AI Technical Summary

Problems solved by technology

First of all, the evaluation effect of this channel evaluation method based on the expert system depends entirely on the selection of evaluation parameters and preset empirical criteria, and lacks an accurate core physical model.

Secondly, the evaluation of the channel is completely based on the current core state, and more attention is paid to the local characteristics and spatial distribution of the adjacent area of ​​the refueling channel, while the evaluation of the aftereffect of the refueling channel is lacking.

Furthermore, the final designed refueling scheme depends heavily on the experience of reactor physics engineers. Under the same evaluation criteria, different personnel may design completely different refueling schemes due to differences in their own experience.

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