| 摘要 |
PURPOSE:To measure continuously and precisely the reactor water in a nuclear reactor by calculating the coating resistance of an oxidized film formed on the electrode of the conductivity measuring device and a correcting coefficient for a cell constant which varies according to a decrease in electrode surface, and correcting the conductivity of sample water on the basis of them. CONSTITUTION:For example, sample water of the reactor water 12 in the nuclear reactor is introduced in a measuring cell 15 and its conductivity is measured by the measuring electrode 16. The measuring electrode 16 has coating resistance because of the formation of the oxidized film due to corrosion and insulating particulates of hematite stick thereupon to reduce the surface area, varying the cell constant. For the purpose of correcting the conductivity of the electrode 16, the mixed solution of a calibrating undiluted solution 2 and ion exchange water 6 is put in a reference measuring cell 10 and a sample measuring cell 15 to measure the conductivity. Further, the concentration of the calibrating undiluted solution 2 is varied and the conductivity is measured again. Then, the conductivity is measured precisely by correcting the conductivity of the measured liquid with the coating resistance and correcting coefficient.
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