Development of Engenvalue Separation Monitor for Nuclear Reactor by Using Position Sensitive Proportional Counter

位置敏感正比计数器核反应堆能量分离监测仪的研制

基本信息

批准号：
07558185
负责人：
YAMANE Yoshihiro
金额：
$ 2.88万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07558185/
关键词：
Position Sensitive Proportional Counter Eigenvalue Separation Reactor Stability Neutron Flux Distribution Spatial Higher Mode Adjoint Flux Time-Sace Correlation Critical Assembly 時間相関空間相関随伴関数未臨界度臨界集合体。

项目摘要

The eigenvalue separation is important as an index for evaluating the degree of stability of nuclear reactors. We intend to develop an eigenvalue separation monitor by using spatial integral of neutron flux measured by the position sensitive proportional counter (PSPC). Through this study, the following results were obtained.(1) It was confirmed from experiments at Kyoto University Critical Assembly that the engenvalue separation can be estimated from the neutron flux measured with a PSPC.The effect of higher modes along the directions not measured must be corrected by numerical calculations.(2) It was confirmed also from experiments that the eigenvalue separation can be estimated without numerical corrections by solving the coupled equations of neutron flux distributions measured by multiple PSPCs. But, to estimate the engenvalue separations excluding an effect of initial flux distortion, multiple experiments depending on subcriticalities are necessary.(3) We prepared the system registering simultaneously both a position signal of the PSPC and its arrival time, and investigated ability of time-space correlation measurement.(4) By adding the nodal method to the previous numerical code on higher modes, we can estimate degenerate eigenvalues with high accuracy.(5) We confirmed that the spatial dependence of detector efficiency is caused by the variety about manufacturing of anode wire supports.It was concluded that the eigenvalue separation monitor based on the flux measured with the PSPC can be developed. But more investigations on the applicability to actual nuclear reactors are needed in future. The time-space correlation measurement is expected to be a new method for measuring parameters of reactor dynamics.

特征值分离作为评价核反应堆稳定程度的重要指标。我们打算利用位置敏感正比计数器（PSPC）测量的中子通量的空间积分来开发特征值分离监测器。通过本研究，获得了以下结果：(1)京都大学Critical Assembly的实验证实，可以根据PSPC测量的中子通量来估计能量值分离。沿未测量方向的高模效应必须(2)实验还证实，通过求解多个PSPC测量的中子通量分布的耦合方程，无需数值修正即可估计特征值分离。但是，为了估计排除初始通量畸变影响的发电机值分离，需要根据亚临界度进行多次实验。（3）我们准备了同时记录 PSPC 位置信号及其到达时间的系统，并研究了时间能力(4)通过将节点方法添加到先前较高模式的数值代码中，我们可以高精度地估计简并特征值。(5)我们证实探测器效率的空间依赖性是由制造过程的多样性引起的。阳极丝结论是可以开发基于PSPC测量的通量的特征值分离监测器。但未来需要对实际核反应堆的适用性进行更多研究。时空关联测量有望成为反应堆动力学参数测量的新方法。