Nuclear Power Station Condenser Unavailable Calculation and Analysis

If the pressure of condenser is higher than the set-point value defined as "condenser unavailable", it will be forbidden to dump any steam into the condenser. As a requirement of CPR1000 nuclear power station, bypass steam must be discharged to condenser at least 10-12 seconds incessantly after the reactor has tripped, otherwise the pipes of the main steam system will be overpressure. As the pressure of the condenser will rise rapidly during some transient conditions, a transient calculation about condenser is needed to meet the requirement of safe dumping steam for nuclear island. A transient calculation in this paper will simulate the pressure variety of condenser related with turbine trip and reactor trip, and the technical solution about avoiding main steam system overpressure is analyzed for safe dumping steam from the nuclear island.