Simulation of melted UO 2 on a 90° bend channel by using the moving particle semi-implicit method for reactor core catcher development
Nuclear Engineering and Design, ISSN: 0029-5493, Vol: 427, Page: 113413
2024
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Article Description
Using a core catcher in the nuclear reactor is a tremendous idea to minimize the risk when the core of the reactor experiences melting conditions. In developing the core catcher design, the behavior of the corium is essential to understand. Therefore, an investigation of the behavior of melted UO 2 is necessary. In this study, the behavior of melted UO 2 flowing in a 90° bend channel was simulated by using the Moving Particle Semi-Implicit method. Important variables such as surface level, velocity, flow rate, pressure distribution, the Reynolds number, and the Froude number have been determined by analyzing open channel flow. The obtained results indicated that the simulation positively agrees with the experiment. By simulation, for fresh water case, the surface levels are 0.02–0.0885 m, the magnitudes of velocities are 0.04–2.94 m/s, flow rates are 0.00033–0.05 m 3 /s, the pressure distributions are 0–3000 Pa, the Reynolds numbers are 0.0349×10 5 –5.07×10 5, and the Froude numbers are 0.0367–3.7095. For UO 2 case, the surface levels are 0.0239–0.1144 m, the magnitudes of velocities are 0.02–3.36 m/s, flow rates are 0.0000624–0.0538 m 3 /s, the pressure distributions are 0–11380 Pa, the Reynolds numbers are 0.102×10 5 –9.93×10 5, and the Froude numbers are 0.049–2.687. The obtained results indicated that, in isothermal case, when the cooling effect are neglected, the flow of UO 2 inside the 90° bend is similar to those of fresh water for gravity-inertia regime in high Reynolds numbers. The flow rates of all liquids were in pillows regime. In addition, mass accumulation at the bend causes a stagnation point at the bend and increases the pressure on the bend wall. Additionally, the density of the liquid plays a significant influence in the pressure distribution. Moreover, when the Reynolds number is high and the flow is typically turbulent, the Froude number becomes a more significant indicator of flow characteristics. The material strength of the bend against pressure is an essential factor that needs to be considered carefully in reactor construction.
Bibliographic Details
Elsevier BV
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