銀ゼオライトを用いたFCVSの高度化

(18)銀ゼオライトXeAを用いた希ガス吸着性能評価

抄録

Various substances such as inorganic iodine, organic iodine, noble gases, and aerosols are generated when a severe accident occurs at a nuclear power plant. Radioactive noble gases are difficult to remove due to their poor chemical reactivity and low solubility in water, but because they have a short half-life, a hold-up system using activated carbon is applied. However, the adsorption of rare gases by activated carbon requires a long contact time and requires large equipment, so emergency response centers attached to nuclear facilities prepare air cylinders and retain the gas for two days as a countermeasure against radioactive noble gases. Rasa Industries has developed silver zeolite XeA as a rare gas adsorbent to replace activated carbon for rare gases. XeA has superior xenon retention performance compared to activated carbon used for noble gas adsorption, and it may be possible to make the conventional hold-up system more compact by replacing activated carbon with XeA. In addition, by replacing combustible activated carbon with noncombustible silver zeolite, fire safety can be enhanced. In applying XeA to a vent system, we fabricated a test device to evaluate various performances, evaluated it under the same conditions as activated carbon, and confirmed the superiority of XeA.