[en] The results of sodium spray fires in air in the 850-m³ CSTF vessel are discussed. During these tests, sodium at 600⁰C was sprayed downward through commercial nozzles located 16 m above the floor. Test AB3 released 48 kg of sodium spray in 140 seconds with 670-μm MMD drop size and produced a maximum pressure increase of 0.041 MPa and 30 g/m³ of airborne sodium compounds. Test NT-1 sprayed 82 kg of sodium at 320 μm MMD drop size over 4.7 hours. In both tests, large stable temperature gradients, not predicated by pre-test SPRAY computer code calculations, were observed. Also, post-test estimations of pressure and aerosol concentration made using SPRAY and HAA-3B codes exceeded actual values measured. Thus, the codes conservatively over-predicted the aerosol leakage potential. The experimental data and the SPRAY and HAA-3B code calculations are compared and discussed