Numerical And Experimental Study On Sodium Columnar Fire In Fast Reactor

Sodium cooled fast reactor was an advanced nuclear power technology. Sodium wasused as coolant in fast and second circuit as its lower density and high thermal conductivity.Sodium was also a kind of active metal. It would burn when leaked out. The consequence ofsodium was very serious. So, this paper was studied on the characteristics of sodium and howto nuclear power plant from it.An experimental platform was established. It was consist of combustion system, fireextinguishing system and data acquisition system. During the experiment, sodium was heatedto200oC, and then was pushed into combustion tank by high pressure nitrogen. Thetemperature was recorded. From the data, the top temperature during the sodium leakage, thetop temperature was800oC. The temperature was reduced as the height of the thermocouplegone up or the distance to the sodium columnar. The top temperature of the ceiling was200oC. The temperature of sodium receiving pan was500oC. The radius of sodium spool onreceiving pan was0.4m.The mathematical model of sodium combustion was established. The experiment wassimulated on computer. Comparing the combustion process with different initial temperatureand the radius of sodium drops, we knew that, the average temperature of the combustiontank rise as the initial temperature gone up, the burning rate increased as the radius of thesodium drops decreased.Metal fire in a room was simulated. Comparing one fire source, two fire sources, threefire sources and different position of the fire sources, we can make conclusions that, theheight of neutral plane decreased as the heat release rate increased. When the heat release ratewas constant, the average temperature of the room went up as the room getting bigger.