核动力厂堆芯毒性的单群点堆模拟及实验验证

为快速且精确地预测堆芯毒性，本文提出了一种通过特定的边界条件确定单群点堆模型参数，再通过单群点堆模型对堆芯毒性进行预测的方法。为验证该方法，以M310堆芯为例，对几种典型工况下的氙毒和钐毒变化进行模拟，并将模拟结果与更加精确的三维两群模型给出的结果进行对比；使用该方法对一起执照运行事件过程中堆芯毒性的变化进行了模拟，并将模拟结果与测量值进行对比。结果表明，模拟结果与测量值吻合很好；通过本文提出的方法，单群点堆模型能以较高的精度追踪压水堆堆芯毒性的变化。 

Poisoning in a Reactor Stimulated by Single Group Point Reactor Model and its Experimental Verification

To predict the poisoning quickly and precisely, a method to determine the parameters of the single group point reactor model with appropriate boundary conditions is developed, and the poisoning is predicted with the single group reactor model. And then,? the evolution of Xenon poisoning and Samarium poisoning is simulated in several working conditions of the reactor of a M310 Nuclear Power Plant with the single group point reactor model. Xenon poisoning and Samarium poisoning calculated by the single group point reactor approximation fits well with the results of a more accurate 3- dimensional 2 group method. The accuracy of the point group model is examined by simulating the Xenon poisoning and Samarium poisoning in a real license operation event. The reactivity worth of Xenon poisoning and Samarium poisoning simulated by the model fits well with the reactivity worth obtained in the experiment. This work shows that the single group point reactor model can illustrate the Xenon poisoning and Samarium poisoning with significant accuracy with the parameters deduced by this method.