一体化多用途的非能动小型压水反应堆发生假定事故的初步分析

采用RELAP5/MOD3.2系统程序建立一体化小型反应堆的事故分析模型,包括反应堆冷却剂系统(RCS)、简化的二回路系统和专设安全设施。一体化多用途的非能动小型压水反应堆(SIMPLE)热功率为660 MWt(电功率大于200 MWe)。针对SIMPLE的直接安注管线(DVI)双端断裂事故和DVI2英寸(50.8mm)小破口失水事故(SBLOCA)进行分析。计算结果表明:对于直接安注管线双端断裂事故,破口和自动降压系统(ADS)能有效地使反应堆冷却系统降压,安注箱(ACC)和安全壳内置换料水箱(IRWST)能实现堆芯补水,确保堆芯冷却;对于DVI的SBLOCA,非能动专设安全设施能有效对RCS进行冷却和降压,防止堆芯过热。

Preliminary Analysis of Small & Integrated Modular Multi-purpose Passive Low-emission Economical Reactor Response to Postulated Event

The accident analysis model for integrated small reactor was established by the code of RELAP5/MOD3.2, including the reactor coolant system (RCS), simplified secondary system and safeguard system. The small & integrated modular multi-purpose passive low-emission economical reactor (SIMPLE) is a 660 MWt (>200 MWe) integral pressurized water reactor. A double-ended direct vessel injection (DEDVI) and a small break loss of coolant accident (SBLOCA) for the direct vessel injection line were analyzed. The results show that the break and automatic depressurization system can depressurize the RCS and the coolant from accumulator and in-containment refueling water storage tank can mitigate the accident consequence of DEDVI. The results also show that the safety system can effectively lower the temperature and reduce the pressure of RCS, also can prevent core overheating for SBLOCA.