Modelling of pressure distributions over fuel-strings for fuel irradiation experiments in the NRU reactor

A pressure-drop model has been developed for the U-1 and U-2 loops of the NRU reactor. It provides local pressure distributions between instrument locations at the inlet and outlet of each loop. Piping components and fuel-string assemblies are modeled for single-phase and two-phase flows. The overall pressure drop comprises frictional and form losses, as well as changes due to acceleration and gravity. Detailed pressure profiles have been …