小型堆稳压器波动管双端破口试验研究

Experimental Study on Pressurizer Surge Line Double-Ended Break of Small Reactor

开展了模块化小堆稳压器波动管双端破口试验研究,获得了非能动安全系统的事故响应特性和一回路系统参数变化。试验研究结果表明,在稳压器波动管双端破口极端工况条件下,中压安注箱能在短时间内提供较大的稳定安注流量,及时补充系统水装量;高压安注系统运行过程比较复杂,安注流量与堆芯补水箱压力平衡管线内介质状态和中压安注系统运行状态密切相关,在1.7 h内呈间歇注入运行状态。在整个事故过程中,堆芯一直处于淹没状态,模块化小堆非能动安全系统能够确保稳压器波动管在双端破口极端工况条件下的堆芯安全。

Accident response characteristics of the passive safety system and the parameter variation of the primary loop system were obtained through the experimental study of double-ended break of modular small reactor pressurizer surge line.The results show that under the extreme condition of double-ended break of the pressurizer surge line,the MP accumulator can provide a large stable safety injection flow in a short time to replenish the water capacity of the system in time;The operation process of the HP safety injection system is relatively complex,and the safety injection flow rate is closely related to the medium state of the pressure balance pipeline of the core makeup tank and the operation state of the MP safety injection system,and it is in the state of intermittent injection within 1.7 hours.During the whole accident process,the core has been submerged.The modular small reactor passive safety system can ensure the core safety under the extreme condition of double-ended break of pressurizer surge line.