Comparative Study of Transfer Functions for NRAD and AGN-201 Reactor Systems

H. Aryal
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Abstract

: The project is about building an infrastructure for an open loop technique and implementing this technique to measure the reactivity worth of small samples. The reactivity samples are allowed to oscillate back and forth in the reactor system to cause perturbations and the corresponding reactor response is measured in the form of the transfer function. The transfer function obtained is used to determine stability characteristics along with other kinetic parameters such as delayed neutron fraction, prompt neutron lifetime, shutdown margins, and absolute power . This paper compares transfer functions for reactors like Neutron Radiography (NRAD) and Aerojet General Nuclear (AGN-201). The magnitude of the transfer function correlates with the reactivity of the sample that caused the perturbation. In addition, the transfer function allows one to determine whether the reactor is a stable system or not. In other words, the reactor’s response to the change in neutron population in the reactor can be easily described. Moreover, a transfer function measurement is useful to extract important kinetic parameters of the reactor system, such as instance prompt neutron generation lifetime, reactivity shutdown margin, absolute power, etc. The transfer function plots presented in the results section correlate the reactivity of the sample that caused perturbations. NRAD was found to have a higher break frequency than that AGN-201. This was an expected result since break frequency is inversely proportional to neutron generation time. With this relation, break frequency was found to be around 306 Hertz. So, the reactor cannot respond beyond this frequency but passes the low frequencies. The corresponding analysis and comparative transfer function plots using MATLAB for these two reactor systems are presented in the results section. Many reactivity measurements have been already in practice however if the transfer function technique can give reactivity measurements with similar or better precision and accuracy, it could be a great benefit. Moreover, this can be installed in those facilities where more complex systems cannot be incorporated easily.
NRAD与AGN-201反应堆系统传递函数的比较研究
该项目是关于为开环技术构建基础设施,并实现该技术来测量小样本的反应性价值。允许反应性样品在反应器系统中来回振荡以引起扰动,并以传递函数的形式测量相应的反应器响应。获得的传递函数用于确定稳定性特性以及其他动力学参数,如延迟中子分数、提示中子寿命、关闭裕度和绝对功率。本文比较了中子放射照相(NRAD)和喷气通用核反应堆(AGN-201)的传递函数。传递函数的大小与引起扰动的样品的反应性有关。此外,传递函数允许人们确定反应器是否是一个稳定的系统。换句话说,反应堆对反应堆中中子数量变化的响应可以很容易地描述。此外,传递函数测量有助于提取反应堆系统的重要动力学参数,如实例提示中子产生寿命、反应性停机裕度、绝对功率等。结果部分给出的传递函数图与引起扰动的样品的反应性有关。NRAD的断裂频率高于AGN-201。这是预期的结果,因为断裂频率与中子产生时间成反比。根据这种关系,发现中断频率约为306赫兹。所以,反应堆不能响应超过这个频率,但通过了低频。结果部分给出了用MATLAB对两种反应器系统的传递函数图进行分析和比较。许多反应性测量已经在实践中,但如果传递函数技术可以给出类似或更好的精度和准确度的反应性测量,它将是一个很大的好处。此外,它可以安装在那些不容易安装更复杂系统的设施中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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