| Summary: | Natural and forced convection experiments(SBTF and French) are simulated with the sodium version of the thermal-hydraulic computer code THERMIT. Simulation is done for the test secti- -on with the pressure-velocity boundary condition and subsequ- -ently extended to the whole loop. For the test section simu- -lation, a s.teady-state and transient calculations are perform- -ed and compared with experimental data. For the loop simula- -tion, two methods are used, a simulated 1-D loop and an actual 1-D loop. In the simulated 1-D loop analysis, the vapor densi- -ty is increased by one hundred and two hundred times to avoid the code failure and the results still showed some of the impor- -tant characteristics of the two-phase flow oscillation in a loop. A mathematical model is suggested for the two-phase flow oscillation. In the actual 1-D loop, only the single phase calculation was performed and turned out to be nearly the same as the simulated 1-D loop single phase results.
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