Development of in-cover gas nickel membrane type hydrogen meter; Studies of leak detector developments on LMFBR's SG (3)

Kuroha, Mitsuo; not registered; not registered; not registered; Daigo, Yoshimichi; not registered; not registered

An in-cover gas hydrogen concentration meter was designed and manufactured as the water leak detector for sodium heated steam generators. This meter consists of a thin nickel membrane, a vacuum system, and an electric heater. The nickel membrane is used under the internal pressure in order to prevent its buckling. This meter was installed in the Small Sodium-Water Reaction Test Loop (SWAT-2) at PNC-Oarai Engineering Center. The specification, the construction and some of the test results are described in this report. The following results were obtained; (1)This hydrogen meter was very compact and capable for the leak detector and the hydrogen concentration meter. (2)The test result indicated that this meter was applicable to hydrogen concentration from 3 Vppm up to 10000 Vppm at nickel membrane temperature of 500C and cover gas pressure of 1 kg/cmG. (3)Hydrogen permeability through the nickel membrane in sodium vapour was similar to that in sodium.