采用蒙特卡罗(MCNP)程序建立模型,对采用钨基金属陶瓷(CERMET)燃料的核热推进反应堆掉落临界安全特性进行了研究.从有效增殖系数的基本定义出发,定义了三个特性参数:不泄漏几率、中子"逃脱"安全棒吸收几率和中子"逃脱"Re、W、Gd、U等的非裂变吸收几率,定量分析了堆芯进水、反射层和掉落环境对核热推进反应堆掉落临界安全的影响,为我国核热推进反应堆的设计提供了参考.%Monte Carlo N Particle( MCNP) code was used to build the model and the dropping criti-cality safety performance of the Nuclear Thermal Propulsion ( NTP ) reactor using tungsten based CERMET fuel was studied. From the definition of effective multiplication factor, three performance parameters were defined including the non-leakage probability,the safety rod absorption "escape"probability and the non-fission absorption ( by Re, W, U, Gd and so on) "escape" probability. The impact of such elements on the criticality safety performance of dropping accident as the water ingress in the core, the reflector and the dropping environment and so on was analyzed using those parameters. It may provide references for the design of our country' s NTP reactor.
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