CAP1400控制棒提升极限分析方法研究

控制棒提升极限用于限定控制棒组棒位和可溶硼浓度的范围,以防止慢化剂温度系数突破限值。CAP1400核电厂采用机械补偿运行策略,使控制棒及硼浓度运行范围大为扩展,同时功能独立的M棒组和AO棒组同时插入堆芯使得插棒情况更为复杂,因此与传统核电厂相比,CAP1400核电厂的控制棒提升极限更难界定。本文建立了适用于CAP1400核电厂的控制棒提升极限分析方法,并给出计算结果。本文提出的方法合理地解决了复杂的控制棒运行情况给提升极限造成的影响,并充分地利用了电厂实测数据对提升极限进行修正。基于本文方法得到的提升极限精确且具备一定的保守性,所以便于电厂实际运行时使用。

Research on Control Rod Withdrawal Limit Analysis Methodology for CAP1400 Plants

Rod withdrawal limit is used to restrict the range of control rod position and boron concentration,to prevent violating the moderator temperature coefficient limit.Mechanical shim operation strategy is used for CAP1400 nuclear power plants,leading to a much larger operation range of control rod position and boron concentration,and a more complicated rod insertion situation because of the maneuvering of M banks and AO bank.Thus the generation of rod withdrawal limit for CAP1400 plants is more complex than traditional plants.This work established a rod withdrawal limit analysis methodology for CAP1400 nuclear power plants.Influence on rod withdrawal limit from the complicated satiation of control rod insertion were properly settled,and measured data from plants were mostly used to compensate the predicted rod withdrawal limit result.Rod withdrawal limit raise by this method is enough accurate and also conservative,and could be used conveniently during plant operation.