DISSOLVED HYDROGEN CONCENTRATION MEASURING METHOD, DISSOLVED HYDROGEN CONCENTRATION MEASURING APPARATUS, AND NUCLEAR POWER PLANT OPERATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a dissolved hydrogen concentration measuring apparatus capable of more accurately measuring a dissolved hydrogen concentration during operation of a nuclear power plant.SOLUTION: In a dissolved hydrogen concentration measuring apparatus 1, a measuring unit 2 including an action electrode 3 and a counter electrode 4 both made of noble metal (platinum, for example) is arranged within a branch pipe 13 attached to a pipe 12. Coolant is present in the pipe 12 and the branch pipe 13. A potentiostat 7 measures a potential difference between the electrodes 3 and 4 and applies a voltage obtained by superimposing an AC voltage on this potential difference to the action electrode 3. A frequency response analyzer 8 measures an AC impedance between the electrodes 3 and 4 while changing a frequency of the AC voltage. An arithmetic unit 9 calculates a resistance of a hydrogen electrode reaction based on the AC impedance, and further calculates a concentration of dissolved hydrogen in the coolant based on the resistance of the hydrogen electrode reaction. Therefore, it is possible to more accurately measure the dissolved hydrogen concentration during operation of a nuclear power plant.