IMPROVING BEST ESTIMATION METHOD FOR CALCULATING REACTOR POWER MEASUREMENT DRIFT OF NUCLEAR POWER PLANT

摘要

The present invention relates to a method of improving a best estimation for quantifying a thermal output power measurement drift of a nuclear power plant, comprising: (a) analyzing a nuclear reactor thermal output power variation rate in relation to a major operation variable variation rate of a secondary system (turbine cycle); (b) deriving a linear proportion relation equation representing a nuclear reactor thermal output power variation rate corresponding to the analyzed major operation variable variation rate of 1%; (c) setting a representative value for a major operation variable of the secondary system (turbine cycle) at the nuclear reactor thermal output power of 100% and 95% by using the derived linear proportion relation equation; (d) deriving a coefficient of determination (R^2) corresponding to a square of a coefficient of correlation (Correlation) mathematically representing a magnitude of the linear relation between two variates; (e) setting a reference value (Base Line Data) of respective operation variables by using the derived linear proportion relation equation, when the nuclear reactor thermal output power is stabilized; and (f) measuring the operation variables at an estimation time point when it is predicted that a drift occurs in the nuclear reactor thermal output power. According to the present invention, the drift in the nuclear reactor thermal output power is quantified, thereby minimizing a thermal performance loss problem due to an overestimation of the nuclear reactor thermal output power, and resolving a stability problem due to an underestimation of the nuclear reactor thermal output power.