采用RELAP5/SCDAP/MOD3.4程序对医院中子照射器I型堆（IHNI-1）在事故工况下的瞬态特性进行研究，对意外大反应性引入和池水丧失事故工况进行了计算和分析，计算结果表明：IHNI-1堆具有良好的固有安全性，在发生大反应性引入和池水丧失事故时，最终能够稳定在较低功率，确保反应堆安全。

RELAP5/SCDAP/MOD3.4 is used to simulate and analyze the transient proceeding of in-hospital neutron irradiator mark 1(IHNI-1) reactor in accident condition.Large reactivity insertion accident and loss of coolent of pool accident are calculated and analyzed.The results show that IHNI-1 reactor is characterized with inherent safety. The negative coolant temperature feedback limits the nuclear power to an stable level and the reactor is safe under the accident.

朱 磊（1986—），男，江西弋阳县人，研究实习员，主要研究方向为核技术及应用