Earthquake-simulator tests of head-mounted equipment in advanced nuclear reactors

Earthquake-simulator experiments were conducted on a scale-model of a base isolated reactor vessel including four representations of head-mounted equipment, with frequencies spanning 4.5 Hz to 27 Hz. Three recorded earthquake motions and one synthetic motion, all triplets, were used as inputs in the experiments. Dynamic responses of the head-mounted equipment, including displacements, accelerations, and strains, were measured in the experiments for three vessel support conditions: conventional, and seismically isolated using Single concave Friction Pendulum (SFP) bearings and Triple Friction Pendulum (TFP) bearings. Seismic isolation was effective at reducing equipment responses (accelerations, displacements, and strains) with respect to those in the conventionally supported vessel across a range of seismic inputs. The data generated in the tests provides insights into the benefits of seismically isolating equipment in nuclear reactors and the accuracies of numerical modelling approaches that can be expected in calculating seismic responses of such equipment.

本试验针对搭载四台顶装设备（head-mounted equipment）模拟件的基础隔震反应堆容器缩尺模型开展地震模拟振动台试验，试验覆盖频率范围为4.5 Hz至27 Hz。试验采用三份实测地震动记录与一份合成地震动作为输入，所有输入均为三分量地震动。试验针对三种反应堆容器支承工况测试了顶装设备的动力响应，响应参数包括位移、加速度与应变；三种工况分别为常规支承、采用单凹摩擦摆（Single concave Friction Pendulum, SFP）支座的隔震支承，以及采用三重摩擦摆（Triple Friction Pendulum, TFP）支座的隔震支承。相较于常规支承的反应堆容器，地震隔震技术可在各类地震输入下有效降低顶装设备的动力响应（加速度、位移与应变）。本试验生成的数据可为核反应堆顶装设备的隔震收益，以及该类设备地震响应数值模拟方法的预估精度提供参考依据。