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Fig.1-14 Diagram of radiolytic-H2 formation and reaction in water

H2 would be emitted into the air in the open condition in a severe accident but dissolved into water in the closed condition typical of reactors. H2 ② formed by radiation ① is scavenged by radicals ④ on the way to the water surface ③, but the scavenging can be blocked by seawater salts ④’.

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