Onset criterion for liquid entrainment in reflooding phase of LOCA.
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概要
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Reflooding tests were conducted in a rod bundle geometry at the maximum pressure of 12 MPa to investigate thermal-hydraulic behavior during a small break loss-of-coolant accident (SBLOCA) in a nuclear reactor. The test conditions ranged 0.6 12 MPa for pressure, up to 920 K for rod surface temperature, up to 20 cm/s for bundle inlet flow velocity and up to 2 kW/m for linear power input. The principal objective of this paper is to investigate the onset condition for liquid entrainment by steam flow in the relatively high pressure reflooding phase. Experimental results showed a tendency that the liquid entrainment decreased with increase in pressure when the other parameters such as an inlet flow rate and rod temperature were fixed. A new correlation for the onset criterion for liquid entrainment was derived from the experimental results and an analysis of a force balance for a liquid droplet. Effects of pressure on liquid entrainment in the reflooding phase were made clear from the experimental and analytical results.
著者
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Tasaka Kanji
Department Of Nuclear Engineering Nagoya University
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Yonomoto Taisuke
Department Of Nuclear Safety Research Japan Atomic Energy Research Institute
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Koizumi Yasuo
Department Of Mechanical Engineering Kogakuin University
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TASAKA Kanji
Department of Reactor Safety Research, Japan Atomic Energy Research Institute
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