Abstract: Spray fire due to the leakage of sodium from pipe of heat exchanger nearby was analyzed to understand its cause and results. The rate of sodium leakage and the diameter of sodium droplet were developed in the piping under postulated fire scenarios. Comparing to the rate of flow and droplet diameter with water spray experiments, on the basis of the analysis of the formation for droplet spray and parameters relationships with different sizes of the hole and flow rate, sodium spray nozzle is selected to gather data of spray fires that will result in more advanced understanding of sodium spray combustion phenomena.