反应堆核测量仪表信号处理方法研究与验证

Research and Verification of Signal Processing Method for Reactor Nuclear Instrumentation

"三代"核电厂反应堆通常使用裂变室探测器作为核仪表系统中间量程中子通量测量,该探测器在抑制白噪声和γ射线等噪声方面非常有优势。裂变室探测器可以同时工作在计数模式、涨落模式和电流模式,因此能够使用一个探测器实现覆盖10个量级以上的中子通量测量。本文从裂变室探测器信号形成的基本原理出发,论述了裂变室探测器信号处理方法的关键步骤,并基于非齐次泊松过程数值仿真的方法论证了该信号处理方法的有效性,最后通过实验堆堆上试验验证裂变室探测器信号处理方法的可用性,试验结果表明在低通量条件下该信号处理方法的计数模式和涨落模式两者的线性误差小于3%,满足核反应堆中间量程中子通量的测量要求。

The "third-generation" nuclear power plant reactors usually use fission chamber detectors as the mid-range neutron f lux measurement of the nuclear instrument system. This detector has great advantages in suppressing noise such as white noise and gamma rays. The fission chamber detector can work in counting mode, f luctuation mode and cur rent mode at the same time, so it can use one detector to achieve neutron f lux measurement covering more than 10 orders of magnitude. Starting from the basic principles of signal formation of fission chamber detectors, the paper discusses the key steps of the fission chamber detector signal processing method, and demonstrates the effectiveness of the signal processing method based on the method of non-homogeneous Poisson process numerical simulation. The test on the experimental reactor verif ies the availability of the signal processing method for the fission chamber detector. The test results show that the linear error between the counting mode and the f luctuation mode of the signal processing method is less than 3% under low-f lux conditions, which satisfies the middle range of the nuclear reactor f lux measurement requirements.