| 摘要 |
PURPOSE:To make it possible to rapidly and accurately measure concns. of H2 and O2, in an apparatus for measuring concns. of H2 and O2 in the accommodation vessel of a nuclear reactor, by arranging a moisture measuring instrument to the upstream of infrared analysers for measuring concns. of H2 and O2 while a dehumidifier is arranged to the downstream side thereof to perform compensation due to moisture. CONSTITUTION:In an H2/O2 concn. measuring apparatus for monitoring that a limit amount or more of H2 and O2 are generated in the atmosphere within the accommodation vessel of a nuclear reactor by the loss accident of the cooling material of the nuclear reactor, a non-dispersing type infrared gas analyser 10 is arranged on the way of the recirculation arranged pipe 2 from the accommodation vessel 4 to rapidly measure moisture and the drying gas from a humidifier 30 provided to the downstream side of said analyser 10 is measured by an H2-analyser 36 and an O2-analyser 38 to prevent the variation in measuring values of H2 and O2 caused by the temp. change of steam. The measuring outputs of the analysers 36, 38 are outputted to a compensator 40 to output H2 and O2 concns. compensated by the measuring signal from the analyser 10. The analyser 10 has a simple structure using a thermocouple and highly reliable and rapid and accurate measurement of H2 and O2 concns. can be performed. |
