METHOD AND DEVICE FOR MEASURING CONCENTRATION OF HYDROGEN IN HIGH TEMPERATURE AND HIGH PRESSURE STEAM

摘要

PURPOSE:To prevent corrosion of a fuel cladding pipe of zircaloy and hydrogen explosion in the event of an accident, etc. and to improve safety of a nuclear reactor by absorbing gaseous hydrogen in a metallic wire having large power to absorb hydrogen and measuring the increase in the electrical resistance of the metallic wire thereby measuring the concn. of hydrogen. CONSTITUTION:Gaseous hydrogen generated in high temp. high pressure steam of primary cooling water for a light-water type power reactor or the like diffuses and permeates through a thin metallic film 1 and is absorbed through the holes of a sintered metal 2 into a metallic wire 3 for measuring electrical resistance. The amt. of the absorbed hydrogen is determined by an increase in the electrical resistance of the wire 3 and the concn. of the hydrogen in the high temp. high pressure steam is measured in accordance with calibration data. The film 1 consists of a metal which does not form any oxide film on the surface in high temp. water and has large power to allow permeation of hydrogen. A PdAg alloy, Ni or the like which is free from hydrogen embrittlement is preferable for said metal. Ni or SUS is preferable for the material of the metal 2. A metal such as Pd, V, Ti or the like which has large power to absorb hydrogen is preferable for the wire 3.