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Failure of containment cooling induces inert containment environment after initial event and results in coexistence of containment overpressure challenge and hydrogen challenge, which is a containment severe challenge status. After Fukushima accident, assessment of hydrogen risk under containment severe challenge status according to Sanmen SAMG in operation is needed. Effect of SCG-2 and SCG-3 from SAMG is investigated; the result shows that establishing of containment cooling does depressurize the containment but steam inert is break and high hydrogen risk is observed. The preferred means in SAMG does not reduce hydrogen inventory, and thus do not mitigate hydrogen risk fundamentally.