核电模拟机的毒物仿真模型的开发与应用

Development and Application of Neutronics Poison Model in Nuclear Power Simulator

在核电站氙(Xe-135)及钐(Sm-149)毒物模型优化设计的研究中,由于传统的毒物模型更多地采用毒物模型独立运算的方式进行建模,至使模型运算复杂,计算无法在瞬态计算中达到实时,模型结果无法达到精度范围以内。为解决上述问题,以核电站全范围模拟机的技术需求为基础,从氙钐毒物的物理模型出发,采用毒物模型与中子物理截面模型相耦合的方法,建立了稳态及动态的数学模型,不仅能精确计算稳态结果,并能精确计算出毒物的瞬态变化。同时,以国内某CPR1000核电站机组为例,对毒物模型的可靠性合理性进行分析验证,结果证明,上述模型能够真实反映毒物在各种瞬态工况中其在堆内的物理变化过程,可满足核电站全范围模拟机的精度需求,可广泛应用于核电站仿真领域。

In the studies of nuclear power plant xenon （ Xe-135 ） and samarium （Sin-149） poison model optimi- zation design, the traditional model uses independent way of computing modeling. It causes the computational com- plexity of the model, the transient calculation can not be reached in real-time, and the accuracy of the model results can not be achieved within the range. To solve this problem, based on the nuclear power plant simulator and depar- ting from the poison physical model, this paper used a new method which couples poison model and model of neutron physics cross-section. A transient mathematical model is built, which can get accurate steady-state results, and as well as the accurate transient results. Take a CPR1000 power plant unit as example, we analyzed and verified the re- liability and rationality of the poison model, it proved that the model can give a true picture of poison in a variety of transient process of physical changes within the reactor, meet the accuracy requirements of the nuclear power plant full scope simulator, and can be widely used in the field of nuclear power plant simulation.