Abstract:Sodium cooled fast reactor is a fast neutron reactor which is rapidly popularized at present.Sodium as coolant has good heat transfer performance.However,due to its active chemical properties and violent reaction with water and air,the leakage of liquid sodium and the fire should be considered.Using the sodium injection test data,the results of sodium spray fire accidents are analyzed based on NACOM program.It is found that the prediction results of NACOM program for pressure and temperature are quite different from the test results under different initial temperatures,and the reasons for the difference are analyzed.By embedding the premixed combustion model based on chemical kinetics and steam film composite resistance model,the premixed combustion model and the droplet motion resistance model in the original program are optimized and tested,and the prediction results of the program are improved.