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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제47권 제1호
발행연도
2015.1
수록면
11 - 25 (15page)

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The accident at Japan's Fukushima Daiichi nuclear power plant in March 2011, caused byan earthquake and a subsequent tsunami, resulted in a failure of the power systems thatare needed to cool the reactors at the plant. The accident progression in the absence of heatremoval systems caused Units 1-3 to undergo fuel melting. Containment pressurizationand hydrogen explosions ultimately resulted in the escape of radioactivity from reactorcontainments into the atmosphere and ocean. Problems in containment venting operation,leakage from primary containment boundary to the reactor building, improper functioningof standby gas treatment system (SGTS), unmitigated hydrogen accumulation in thereactor building were identified as some of the reasons those added-up in the severity ofthe accident. The Fukushima accident not only initiated worldwide demand for installationof adequate control and mitigation measures to minimize the potential source term to theenvironment but also advocated assessment of the existing mitigation systems performancebehavior under a wide range of postulated accident scenarios. The uncertainty inestimating the released fraction of the radionuclides due to the Fukushima accident alsounderlined the need for comprehensive understanding of fission product behavior as afunction of the thermal hydraulic conditions and the type of gaseous, aqueous, and solidmaterials available for interaction, e.g., gas components, decontamination paint, aerosols,and water pools. In the light of the Fukushima accident, additional experimental needsidentified for hydrogen and fission product issues need to be investigated in an integratedand optimized way. Additionally, as more and more passive safety systems, such as passiveautocatalytic recombiners and filtered containment venting systems are being retrofittedin current reactors and also planned for future reactors, identified hydrogen andfission product issues will need to be coupled with the operation of passive safety systemsin phenomena oriented and coupled effects experiments. In the present paper, potentialhydrogen and fission product issues raised by the Fukushima accident are discussed. Thediscussion focuses on hydrogen and fission product behavior inside nuclear power plant

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