Dynamic Modeling of the Free Piston Stirling Pump for the Passive Safety Injection of the Next Generation Nuclear Power Plant

차세대 신형원자로의 피동형 안전 주입장치를 위한 프리피스톤 스터링 펌프의 동특성 모델

This paper describes a passive safety injection system with free piston Stirling pump working withabundant decay heat in the nuclear reactor during the hypothetical accident. The water column in the tube assembly connected from the hot chamber to the cold chamber in the pump oscillates periodically due to thermal volume changes of non-condensable gas in each chamber. The oscillating pressure in the water column is converted into the pumping power with a suction-and-bleed type valve assembly. In this paper a dynamic model describing the frequency of oscillation and pumping pressure is developed. It was found that the pumping pressure is a function of the temperature difference between the chambers. Also, the frequency oscillation depends on the length of the tube with water column.