STUDY OF SACRIFICIAL GRID PLATE MELTDOWN IN NUCLEAR SEVERE ACCIDENT

• Main Author: Nuril Hidayati, Anni
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73184
• Institution: Institut Teknologi Bandung

Liquid metal breaching onto a sacrificial grid plate is an important aspect that needs to be considered in the nuclear severe accident analysis. The present study aims to investigate the dynamic behaviors and impingement process of liquid metal jet impingement onto a metal plate at various fundamental parameter such as plate’s thickness and initial temperature. The experiments and numerical simulation were performed with wood’s metal and lead bismuth eutectic alloy. The modified MPS method was used to perform the numerical calculation based on the particle movement. Moreover, the modified MPS was used to simulate higher initial temperature and condition based on previous research. The numerical simulation predicted cross sectional sequences of liquid metal jet impingement which could not be seen experimentally. The results show that the plate was locally melted by the heat supplied from the liquid metal jet and induced the liquid metal penetration. However, there was a cracking process occurred in 0,3 mm plate’s thickness. The interpolation data of formed hole size at various plate thickness was approximated with logarithmic trend. Moreover, a larger amount of liquid metal stayed, then liquid metal pool was formed when the liquid temperature jet was lower. The hole diameter formed via the melting mode was larger than that of the liquid metal jet. The required time for the liquid metal penetration was shorter when the liquid metal temperature was higher. The increase of conduction heat transfer during the solidification of liquid metal could decrease the Nu number at the stagnation zone. The findings show that experimental and numerical methods can be used to analyze the solidification process during the critical time of liquid metal impingement.