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학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제46권 제4호
발행연도
2014.1
수록면
529 - 540 (12page)

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In this research, a drop impact analysis of a fuel assembly in a research reactor is carried out to determine whether thefuel plate integrity is maintained in a drop accident. A fuel assembly drop accident is classified based on where the accidentoccurs, i.e., inside or outside the reactor, since each occasion results in a different impact load on the fuel assembly. Ananalysis procedure suitable for each drop situation is systematically established. For an accident occurring outside the reactor,the direct impact of a fuel assembly on the pool bottom is analyzed using implicit and explicit approaches. The effectsof the key parameters, such as the impact velocity and structural damping ratios, are also studied. For an accident occurringinside the reactor, the falling fuel assembly may first hit the fixing bar at the upper part of the standing fuel assembly. Toconfirm the fuel plate integrity, a fracture of the fixing bar should be investigated, since the fixing bar plays a role in protectingthe fuel plate from the external impact force. Through such an analysis, the suitability of an impact analysis procedureassociated with the drop situation in the research reactor is shown.

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