DEC decreases core flow at a constant rate after an initial flow acceleration. The cursor must be moved to the DEC control button and the left mouse button pressed and held for the duration of the core flow decrease. The flow decrease decelerates and stops after the mouse button is released. Rate change can be made at any time during transient. The default critical position is indicated for the shutdown initial condition.
Random selection is only possible when control rods are fully inserted before rod movement.
Once rods are moved or core flow is changed, this selection option is disabled. The option is also disabled for an initial condition of criticality. Selection possible at beginning of transient before rod move or core flow change. Thereafter, option is disabled. Default beta is 0.0065.