权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

research on direct measurement of time series and spatial distribution of reactor noises for criticality safety

临界安全反应堆噪声时间序列和空间分布直接测量研究

基本信息

批准号：
08558049
负责人：
MATOBA Masaru
金额：
$ 5.5万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

The reactor noise signal is long used to characterize neutron field parameters in reactors and/or critical assemblys. There are many procedures to determine the time correlation of noise signals, as methods of Feynman-alpha, Rossi-alpha power spectrum and so on. These procedures are rearized with some module-type hardwares, for example, multi-channel scaler (MCS), so-called time analyzers, fast Fourier transformers, with special analytical formula.In the present work, direct reading of the arriving time of detector signals is realized and further applications are tried. Intrinsically, the information of the reactor noise is included in the time-series of the signal from the used detector and their direct measurement should provide all the required data. Direct reading of the arriving time of detector signal has been performed generally by audio tape recorder (ATR) and applications to reactor noise measurements are sometimes tried. Although the ATR method is simmple and useful, the data … More treatment is not of on-line, the dead-time characteristics is not clear in mu second region and technique of increasing the number of input is not established in general. Especially, recent requirement is possibility of fast on-line data accuisition.Authors have developed a test system to realize the direct time-series data accusition with a microcomputer and the designed system has been appllied to measure neutron field parameters. To read directly the arriving time of the signal in a memory address of a computer, a control circuit is installed in the interface of a micro-computer, which consists of gate, clock and registration circuits.After several works, a finaly designed circuit is completed. This circuit reads each event signal with attaching the arriving time using a 0.5MHz clock. It has dead-time performance of about 1mus under kHz counting condition. The number of input is increased to four and then several cross-correlation measurement become possible. This system has been tested several times at the sub-critical assembly of Kyushu University, the Kinki University Reacter and the critical assembly(DCA) of Power Reactor and Nuclear Fuel Development Corporation. Finaly, technique of the direct time-series data accuisition is accomplished, and on-line data of Feynman-alpha, Rossi-alpha, and power spectrum analyses are obtained from one time-series data from a detector and the concept of direct time-series measurement of signal from a neutron field without any special hardware is established. Less

反应堆噪声信号长期以来被用来表征反应堆和/或关键组件中的中子场参数。确定噪声信号时间相关性的方法有很多，如Feynman-Alpha、Rossi-Alpha功率谱方法等。利用多通道定标器(MCS)、所谓的时间分析仪、快速傅立叶变换等模块化硬件，结合特殊的解析公式，实现了探测器信号到达时间的直接读取，并对其进一步应用进行了尝试。从本质上讲，反应堆噪声的信息包含在来自所用探测器的信号的时间序列中，其直接测量应该提供所需的所有数据。探测器信号到达时间的直接读取通常是由磁带录音机(ATR)执行的，有时也尝试将其应用于反应堆噪声测量。虽然ATR方法简单而有用，但Data…更多的处理不是在线的，亩二区的死区特性不清楚，增加投入的技术普遍没有建立。特别是目前对快速在线数据采集的要求，作者开发了一种用微型计算机实现时间序列数据直接采集的测试系统，并将该系统应用于中子场参数的测量。为了直接读取计算机存储地址中信号的到达时间，在微型计算机的接口上安装了控制电路，该控制电路由门电路、时钟电路和注册电路组成，经过几次工作，最终完成了电路的设计。该电路读取每个事件信号，并使用0.5 MHz时钟附加到达时间。在kHz计数条件下，其死区性能约为1mus。输入的数量增加到四个，然后可以进行几个互相关测量。该系统已经在九州大学的次临界组件、近海大学反应堆以及动力反应堆和核燃料开发公司的关键组件(DCA)上进行了多次测试。最后，完成了时间序列数据的直接采集技术，从探测器的一次时间序列数据中获得了Feynman-α、Rossi-α和功率谱分析的在线数据，建立了不需要任何特殊硬件的中子场信号的直接时间序列测量的概念。较少