Experimental Study on the Effects of Temperature and pH on the Deposition of Corrosion Products in Fusion Reactor

Abstract

Deposition of corrosion products increases radiation in primary coolant loops of reactor. The effects of temperature and pH on the deposition of corrosion products in fusion reactor were experimentally investigated. Experimental conditions are that the highest temperature is 150 °C, the range of pH is 7.00–10.50 and the flow rate is 5.667–5.696 m3/h. Magnetite particles with 99.5 % purity are used to simulate corrosion products in this experiment. State of loop was made stable by heating and pressurizing. Thickness of deposition in primary and test pipelines is determined by oxide skin thickness gauge (model OMD-100), with accuracy of 0.1 μm. The experimental results indicate that a higher value of pH is more profitable for reducing deposition of corrosion products in primary coolant loops, and the temperature of 140 °C should be focused because there exists maximum value of deposition thickness. Higher value of pH is benefit for corrosion products transport from fusion reactor core to steam generator. Furthermore, there exists an appropriate pH, such as pH = 9.00, which can make the deposition thickness get smallest in primary pipelines on the whole. In addition, higher curvature causes larger flow resistance, which makes corrosion products easier to deposit.