BWR堆芯和区间功率-流量振荡计算

The Calculations of BWR Core-wide and Region Power/Flow Oscillation

用RAMONA-3B程序、BWR/4模型及1/8和1/2堆芯的几何形状计算了BWR两种形式的振荡——由于堆芯入口回路振荡引起的堆芯功率(同相)振荡和由于平行通道间流量(不同相)振荡引起的区间功室振荡。对于影响稳定性的一些因素进行了灵敏度分析。计算表明,振荡的激发國和振幅对反应堆的状态很敏感,振荡的频率范围为2.6—2.9秒。

Two type of oscillations were calculated using both an eighth-core and half-core geometric model by RAMONA-3B, they are core-wide(in phaes) oscillations due to core inlet flow loop oscillations as well as region-wide power distribution oscillations due to out-of-phase parallelchannel flow oscillationa. Several sensitivity calculations were performed The calculations indicate that amplitude and the excitation threshold are sensitive to operating condition.The calculated period ranged from 2.6 to 2.9 seconds.