核电平台连接机构设计与运动响应分析

Design of connecting mechanism and motion response analysis on nuclear power platform

[目的]为满足深海冰区海洋核反应堆安全工作的要求,设计冰区核电平台与弹簧阻尼连接机构。[方法]利用三维势流理论及刚体动力学理论建立平台与连接机构的仿真模型。计算平台所受弹簧阻尼力,研究连接机构刚度、阻尼系数特性,选择最佳方案。应用离散元法进行冰载荷数值模拟,通过计算试验椎体所受冰载荷,验证该方法的准确性。研究浪、风、流或海冰、风、流环境载荷联合作用下平台的运动响应。[结果]结果显示,平台系泊于深海冰区可远离海啸的影响,环境承载平台能较好抵抗冰载荷;在连接机构与系泊系统的作用下,核堆支撑平台可抵御福岛核泄漏事故最大海啸波高与17级超强台风的联合作用;在北海万年一遇风暴作用下,核堆支撑平台的水平位移与水深之比、垂荡与纵摇响应及垂向加速度均小于海上浮动核电平台(OFNP)。[结论]核电平台与连接机构的设计可保证应用于深海冰区的核堆的安全稳定。

[Objectives]To ensure marine nuclear reactor safety in deep-water ice regions, this paper proposes a design for an ice region nuclear power platform and spring damper connecting mechanism.[Methods]The platform and connecting mechanism simulation model is established using the three-dimensional potential theory and rigid-body dynamics. The spring and damper force is calculated, then connecting mechanism stiffness and damping coefficients are analyzed and the best scheme selected. The discrete element method is used to simulate ice load. The accuracy of the method is verified by calculating ice load on the experimental conical structure. Platform motion response is calculated under environmental loads of combined wave, wind and current, or ice, wind and current.[Results]The ice region load-bearing platform can resist ice load. The nuclear reactor supporting platform can resist a Fukushima nuclear accident maximum tsunami wave height and Level 17 super typhoon combination under the action of the connecting mechanism and mooring system. Under the 10 000-year return-time storm action in the North Sea, the ratio of horizontal displacement to water depth, heave and pitch response and vertical acceleration of the nuclear reactor supporting platform are all smaller than those of an Offshore Floating Nuclear Plant(OFNP).[Conclusions]This design for a nuclear power platform and connecting mechanism can ensure nuclear reactor safety and stability in deep-water ice regions.