改进断源法测量吸收棒的效率

• 作 者: 阎俊英rrrrrrrrn 赵郁森rrrrrrrrn 李茂季
• 出 处: 原子能科学技术
• 发表日期: 1984年05期
• 关键词: 子管 断源法 反应性测量 中子数 缓发中子 控制棒 多道分析器 法作 测量过程 重水堆

一、引言跳源法是刻度控制棒效率、测量负反应性的常用方法之一。对于重水堆,由于存在光致缓发中子,要想使跳源前堆内中子水平真正达到平衡要等待相当长的时间,跳源后,等待全部缓发中子衰减完也需很长时间。文献[1]中对经典的断源法作了改进。本实验对此作了进一步改进,预先置定的加源时间由5分钟缩短到100秒和50秒,这样即可缩短实验周期,也可延长中子管的便用时间。有源时,中子数随时间的变化由常数处理变为按折线近似,这样可以进一步提高测量结果的精度。另外采用断开主脉冲的办法代替断开中子管阴极电压。整个测量过程随分析器启动、关闭,而开始、停止,加源,断源自动进行。

I. INTRODUCTION The jumper source method is one of the commonly used methods for controlling the rod efficiency and measuring the negative reactivity. For heavy water reactors, due to the presence of photo slow-release neutrons, it takes a long time for the balance of neutrons in the heap before the jump source to wait for a long time. time. The literature [1] made an improvement on the classic source-breaking method. This experiment made further improvements, pre-set plus source time from 5 minutes to 100 seconds and 50 seconds, so you can shorten the experimental period can also extend the use of neutron tube time. When active, the change of neutron number with time changes from constant to polyline approximation, which can further improve the accuracy of measurement results. In addition to open the main pulse instead of breaking the neutron tube cathode voltage. The entire measurement process with the analyzer to start, shut down, and start, stop, add source, source automatically.