核电厂凝汽器故障信号定值的计算与分析

Nuclear Power Station Condenser Unavailable Calculation and Analysis

核电厂的凝汽器压力达到"不可用"设定值后,将禁止旁路蒸汽向凝汽器排放。CPR1000系列反应堆要求,在紧急停堆先于凝汽器达到"不可用"设定值之前发生的情况下,仍能通过旁路系统继续向凝汽器排放蒸汽10～12s,否则将引起主蒸汽系统管路超压。某些瞬态工况下,凝汽器的压力上升较快,为满足核岛蒸汽安全排放的要求,需对瞬态工况下凝汽器的压力变化进行仿真计算。本文通过模拟汽轮机紧急停机及紧急停堆后的凝汽器压力变化规律,研究满足核岛蒸汽安全排放要求的技术方案,解决瞬态工况下主蒸汽管道的超压问题。

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.