渐进周期法测量反应性等待时间分析

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Waiting Time Analysis for Asymptotic-Period Measurement of Reactivity

Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan, 621900, China

摘要: 反应堆功率增长达到渐进指数周期所需的等待时间是渐进周期法测量反应性的关键问题。本文从点堆动力学方程出发,求解了反应性阶跃变化后中子数增长的时间函数,分析了影响等待时间的物理因素,并为2种周期测量方法(2倍周期法和拟合e倍周期法)建立了测量周期随等待时间的误差函数。通过分析得到结论:等待时间与外源、缓发中子和初、终态反应性有关;拟合e倍周期法所需等待时间比2倍周期法短。
- 渐进周期法 /
- 反应性 /
- CFBR-II堆
Abstract: Evaluation of waiting time is a key problem for asymptotic-period measurement of reactivity.Based on the point reactor kinetics equation,the neutron multiplication function and error function for two period-measuring methods are deduced.The two methods include the double power method and the exponential-simulating method.The conclusion is drawn that waiting time is concerned with the external neutron source,delayed neutron parameters and reactivity.The exponential-simulating method can get the earlier asymptotic period than the double power method.
- Asymptotic-period measurement /
- Reactivity /
- CFBR-II