CORROSION POTENTIAL SENSOR, BOILING WATER REACTOR POWER PLANT AND pH SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a corrosion potential sensor provided with a structure densely filling a specific amount of oxide powder in a limited space and capable of a long term use and a boiling water reactor power plant. SOLUTION: The corrosion potential sensor has a sensor box which is made by connecting a cylindrical metal body 5 to the open end of a zirconia cylinder 1 closed at the one end by way of an intermediate metal cylinder 6 for connection and has a structure that metal powder 3 for power collection and metal oxide powder 2 for electrochemical system consisting of a compact are sealed in the zirconia cylinder 1 and a potential detection lead conductor 4 is arranged for short-circuiting the metal powder 3 for power collection to detect the potential by a mineral-insulated cable 7 by way of the lead conductor 4. The packing density of silver oxide rises to 2 to 3.5 times compared with conventional natural packing method, which prevents the zirconia tube inside from silver oxide depletion, maintains oxygen partial pressure constant for a long period and makes to obtain a corrosion potential sensor capable of long term use.