For example, during a turbine load reduction (e.g., caused by failure of 1/3 condensate pumps), the automatic reactor control system cannot reduce reactor thermal power as fast as the turbine power must decrease. In fact, the turbine bypass system usually corrects the system pressure of the power conversion unit. The steam dump valves automatically open under a sudden reduction in turbine-generator load or a turbine trip, which causes an increase in the system pressure. The system’s capacity depends upon certain plant design, but it may be around 40 – 50% of nominal steam production. ![]() This heat is rejected to the condenser through the steam dump valves. ![]() The function of the turbine bypass system is to remove excess energy from the reactor coolant system by discharging a stated percentage of rated main steam flow directly to the main condensers, i.e., bypassing the turbine. The turbine bypass system (TBS) or the turbine steam dump system provides operational flexibility so that the plant may accept certain load changes without disturbing the nuclear steam supply system (NSSS).
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