SIMULATION OF SAFETY PLUG IN MOLTEN SALT FAST REACTOR IN NUCLEAR ACCIDENT BY USING MOVING PARTICLE SEMI IMPLICIT

• Main Author: Juli Yanti, Nita
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57433
• Institution: Institut Teknologi Bandung

Generation IV reactors are expanded to have higher safety level than previous generation reactors. One of the generation IV reactor is Molten Salt Fast Reactor (MSFR) with safety system use freeze plug and drainage pipe. When an accident occur, freeze plug will melt and fuel will flow to the safety tank to be cooled. This research studies simulation of freeze plug melting use Moving Particle Semi Implicit (MPS) method. MPS method is a particle method for incompressible medium. Interaction between particles is calculated use discretized gradient and laplacian and apply weight function. Two geometries of freeze plug were used. They were geometry with copper and without copper. Height and radius of freeze plug were 30 mm. Thickness of hastelloy N and copper were 8,5 mm and 2,5 mm. Distribution of temperature was applied because of heat transfer from molten salt. The result shows melting time with copper and without copper are 125 second and 250 second. Copper utilization made the melting process twice faster. Parametric surveys have been done with variation of copper thickness, hastelloy N thickness, and value of radiusofLaplacianForTemperature. Copper thickness were varied at 1,5 mm, 2,0 mm, 2,5 mm, 3,0 mm, and 3,5 mm with addtion to the inside of freeze plug. The result shows increase in thickness accelerate the melting time of freeze plug. Hastelloy N thickness were varied at 7,5 mm, 6,5 mm, 5,5 mm, and 4,5 mm. The result shows decrease in thickness accelerate the melting time of freeze plug. Value of radiusoflaplacianForTemperature were varied at 3.1, 4.1, and 5.1. The result shows radius 3.1 has fastest melting time than radius 4.1 and 5.1. From this research, the optimal thickness of copper and hastelloy N are 3,5 mm and 4,5 mm. Value of radiusoflaplacianForTemperature can use 3.1 because it produce fastest heat transfer.