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.

特征值分离是评估核反应堆稳定性程度的指数。我们打算使用由位置敏感比例计数器（PSPC）测量的中子通量的空间积分来开发特征值分离监视器。通过这项研究，获得了以下结果。（1）可以从京都大学的实验中确认，可以从用PSPC测量的中子通量来估算工程值分离的估计。沿PSPC的中子通量的效果。沿方向未测量的较高模式的效果必须通过数值的计算来纠正（2），它可以通过数值来纠正（2）。由多个PSPC测量的中子通量分布的耦合方程。但是，为了估计不包括初始通量失真的效果的工程值分离，需要取决于亚临界点的多个实验。（3）我们准备了同时注册的系统，同时注册了PSPC的位置及其到达时间及其到达时间的位置，并调查了时间空间相关测量的能力。（5）我们证实，检测器效率的空间依赖性是由阳极线支持的多样性引起的。它得出的结论是，基于用PSPC测得的通量的特征值分离监视器可以开发出来。但是，将来需要对实际核反应堆的适用性进行更多调查。预计时空相关测量将是测量反应器动力学参数的新方法。