Advanced radioactive material removal system by silver zeolite. (11) Filtered containment venting system (FCVS) hydrogen measures

Since various gases such as CO are generated by MCCI (Molten Core Concrete Interaction), this is suppressed by injecting water into the lower part of the containment vessel. In order to install silver zeolite in the containment vessel and confirm whether it can play an auxiliary role in the hydrogen recombiner, we conducted joint research with PSI on the effects of CO and other substances on hydrogen reactivity. AgX exhibits a remarkable hydrogen-catalyzed reaction as before in a water vapor-free environment. Furthermore, it was found that when carbon monoxide coexists, CO is also removed. On the other hand, it was found that when the water vapor content is 85% or more and the air content is extremely low at 7%, the catalytic reaction between hydrogen and carbon monoxide is unlikely to occur. The amount of hydrogen treated was calculated from the results of the AgX hydrogen reaction test. Under the conditions of sample temperature 170 ℃, residence time 0.092 seconds, air 45%, hydrogen 5%, water vapor 9%, and atmospheric pressure, it was found that the hydrogen processing capacity per AgX unit weight was 0.207 kmol / kg or more of hydrogen. (author)