反应堆冷却剂泵惯量设计影响因素研究

主泵惯量设计应考虑主泵本身和回路特性的综合影响。本文建立了基于四象限特性的主泵惰转数值计算模型，评估主泵本身和回路特性对主泵惰转的影响。结果表明，转动惯量、摩擦损失等主泵因素，沿程阻力、局部阻力等回路因素均影响主泵惰转流量特性，但惰转转速下降主要与主泵本身因素相关，与回路因素关系不大。采用初始动能比ε表征主泵惯性和回路流体惯性的综合影响，流量下降相对转速下降的滞后程度与ε线性相关。对于ε较大的回路，应充分考虑惰转流量的滞后影响，避免主泵转动惯量设计采用过大的裕量，造成机组效率下降和设计难度提高。

Investigation on Influence of Various Factorsin Reactor Coolant Pump Inertia Design

Mutual effects of loop and pump characteristics shall be considered for reactor coolant pump(RCP)inertia design.Based on pump four-quadrant characteristics,numerical model of RCP coastdown analysis was developed to evaluate the combined effect of loop and pump characteristics.The results show that flow coastdown is influenced by pump factors such as inertia and friction loss,and loop factors such as friction loss and form loss.However,speed coastdown is dominantly relevant to pump factors rather than loop factors.Comprehensive effect of all the factors was defined as initial kinetic energy ratio ε.Flow coastdown relative delay to speed coastdown is linear related to ε.This delay shall be fully considered for those loops with higher ε,to avoid excessive margin for pump inertia design which relates to lower overall efficiency and significantly increased design difficulties.