| 摘要 |
A method for measuring the filling level of a liquid in a pressure vessel of a boiling-water reactor, includes measuring the pressure difference between a lower subspace and a reference column, determining steam density in an upper subspace from the measured pressure, determining liquid density in the lower subspace, determining the liquid density in the column, subsequently determining the level in the vessel from the liquid densities in the lower subspace and column, from the steam density in the upper subspace and from the pressure difference and from taking into account time-dependent transient alterations of the values of the densities by measuring the pressure change over time in the upper subspace, the power output and the temperature of the liquid in the vessel, determining therefrom the liquid density in the lower subspace and the steam density in the upper subspace with the measured pressure in the steam space and with known dimensions and quantities, and measuring ambient temperature in the vicinity of the column and determining the liquid density in the column therefrom with known quantities, by using a vertical distance between the bottom of the vessel and a connecting flange of an input line of a pressure difference meter connected to the lower subspace, using a vertical distance between the two connecting flanges, the second flange belonging to a pressure input line of the top of the column and being connected to the upper subspace, and using the gravity constant of the earth.
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