Critical heat flux prediction device, critical heat flux prediction method and safety evaluation system
AssigneeMitsubishi Heavy Industries, Ltd.
InventorTadakatsu Yodo
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Abstract
A critical heat flux prediction device, a critical heat flux prediction method, a safety evaluation system, and a core monitoring system using the safety evaluation system can predict critical heat flux in a core of a reactor with a high degree of accuracy by obtaining a correlation plot distribution representing a relation of critical heat flux on a thermal equilibrium quality based on experimental data, approximating a correlation plot distribution through a logistic function that is a model function in which critical heat flux is expressed by a function of a thermal equilibrium quality, and obtaining a critical heat flux correlation of critical heat flux and a thermal equilibrium quality.
Claims7
A critical heat flux prediction device, comprising:
- a storage unit for storing experimental data including a thermal equilibrium quality decided based on sampled critical heat flux and an experimental condition;
- an experimental data plotting unit for obtaining a correlation plot distribution representing a relation of critical heat flux on a thermal equilibrium quality based on the experimental data;
- and
- a critical heat flux correlation calculating unit for obtaining a correlation of the critical heat flux and the thermal equilibrium quality by approximating the correlation plot distribution by a logistic function that is a model function in which the critical heat flux is expressed by a function of the thermal equilibrium quality.
A critical heat flux prediction method, comprising:
- acquiring experimental data including a thermal equilibrium quality decided based on sampled critical heat flux and an experimental condition;
- obtaining a correlation plot distribution representing a relation of critical heat flux on a thermal equilibrium quality based on the experimental data;
- and
- obtaining a correlation of the critical heat flux and the thermal equilibrium quality by approximating the correlation plot distribution by a logistic function that is a model function in which the critical heat flux is expressed by a function of the thermal equilibrium quality.
A safety evaluation system, comprising:
- a core condition calculating unit for performing state analysis of a reactor;
- a sub-channel analyzing unit for obtaining three-dimensional (3D) fluid behavior inside a core of the reactor according to the state analysis of the reactor;
- a critical heat flux ratio calculating unit for calculating a critical heat flux ratio of a fuel rod that is thermally harshest in the core as a minimum critical heat flux ratio based on the 3D fluid behavior;
- and
- a safety determination evaluating unit for performing a safety evaluation by comparing the minimum critical heat flux ratio with an allowable limit value,
- wherein a logistic function in which critical heat flux is expressed by a function of the thermal equilibrium quality is used as a critical heat flux correlation for obtaining the critical heat flux ratio.
Dependencies are inferred from the claim text.