Simulation of a thermohydraulic transient in a pipe using the COMMIX-1A computer code. [LMFBR]

The numerical aimulation of a section of a LMFBR intermediate pipe loop during a typical CRBR scram has been carried out using the COMMIX-1A computer code. COMMIX-1A is a three dimensional, transient, sngle-phase component computer code with both Cartesian and cylindrical coordinates for thermal hydraulic analysis. A considerable top to bottom temperature differences in the pipe is found as a result of flow stratification. The top to bottom temperature difference can be as high as approximately 50% of the temperature difference of the forcing function employed in the transient.