이상 유동환경에서의 증기 발생기 세관의 프레팅 마모 특성평가

Tubes in nuclear steam generators are held up by supports because the tubes are long and slender. Fluid flows of high-pressure and high-temperature in the tubes cause oscillating motions between tubes and supports. This is called as FIV (flow induced vibration), which causes fretting wear in contact parts of tube-support. The fretting wear of tube-support can threaten the safety of nuclear power plant. Therefore, a research about the fretting wear characteristics of tube-support is required. This work is focused on the influence of two phase flow on the wear amount of tube-support material at room temperature. The tube and support materials were Inconel 690 and 409 SS, respectively. The wear tests were conducted in various environments, which are in water without flow, in flowing water and in flowing water with air. The results showed that the flow of water influenced on the decrease of the wear-life of tube comparing with in water without flow.