High Order Harmonic Wave Filtering Method Used In Prompt Neutron Attenuation Constant Calculation Of ADS Sub-Critical Reactor
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摘要: 欧盟开展的外源倍增(MUSE)系列实验表明:脉冲中子源(PNS)方法是一种适用于深次临界堆中子增殖系数(keff)测量的方法,在PNS方法中,瞬发中子衰减常数α的准确与否是精确测量keff的关键。本文针对"快热"耦合次临界装置——"启明星1#"上的α测量进行分析,采用高次谐波滤除方法,得到拟合α值的时间区间,在该时间区间内得到的α与探测器位置无关。同时将由α计算出的次临界系统的瞬发中子倍增系数kp与蒙特卡罗程序(MCNP)计算结果进行对比分析,两者符合较好。研究表明:高次谐波滤除方法可有效避免α值测量依赖于探测器位置的问题,由该方法得到的α值可用于加速器驱动洁净核能系统(ADS)次临界反应堆keff离线监督。Abstract: MUSE（Multiplication with an external source） series experiments carried out by the EU show that the Pulsed Neutron Source（PNS） method is appropriate for keffmeasurement in deep sub-critical conditions.In PNS method,the accuracy of prompt neutron attenuation constant α plays a key role for accurately keff measurement.In this paper,the analysis of α constant measurement on fast-thermal coupled subcritical facility Venus-1# is performed.By using high order harmonic wave filtering technique,the time interval for α fitting is obtained and the fitted α values are spatially independent with locations of detectors.Furthermore,the comparison of prompt multiplication factors kpderived from fitted α and calculated by MCNP（Monte Carlo N Particles） is made,which shows a good conformation.Results in this research indicate that,the high order harmonic wave filtering method can effectively avoid the problem that the measured α values depend on the locations of detectors,and the α values obtained from which can be used for keff off-line monitoring in ADS sub-critical reactors.
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