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STUDIES ON DEVELOPMENT OF AUTOMATIC FUEL MONITORING SYSTEM FOR A POOL-TYPE RESEARCH REACTOR

池式研究堆燃料自动监测系统开发研究

基本信息

批准号：
07558285
负责人：
HAYASHI Shu A
金额：
$ 0.77万
依托单位：
RIKKYO 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 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07558285/
关键词：
Fuel Failure Detection Fuel Monitoring System Fission Products Pool-Type Research Reactor Fission Rare Gases Germanium Detector Rubidium-89 Caesium-138

项目摘要

Studies on developing a sensitive monitoring method of possible release of fission products (FP) from a fuel element have been made for a pool-type research reactor. It consists of introducing gas bubbles into reactor coolant water to extract effectively the dissolved fission rare gases, ^<89>Kr and ^<138>Xe, produced somewhere in the core, and counting their respective daughter nuclides, ^<89>Rb and ^<138>Cs with high efficiency.The measurements were done by either method, (Method I) on a filter paper by sucking the bubbled gas and air covering water of the reactor tank, or (Method II) in the washing water of bubbled gas sampled into a bottle at the water surface. Various causes that influence the detection efficiency (DE) of the daughter nuclides in both methods were studied. These include the flow rate of introducing gas, position (depth and radial direction) of gas exit in the water, whether the coolant was circulated or not, and (for Method II) standing time of the sampled gas between the sampling and washing the gas with water. On the basis of these experimental data, we have designed and constructed an automatic fuel monitoring system of the continuous mode experiment, for routine use by adopting Method II.It is composed of an intermittent sampling of the bubbling gas into bottle at the water surface, conveying the bottle until near the detector, standing the bottle for a definite time, shaking the bottle, and measuring the nuclides contained in the water. The system have performed effectively measuring ^<138>Cs as a routine fuel monitoring system.

对池式研究堆燃料元件可能释放裂变产物（FP）的灵敏监测方法进行了研究。该方法是在反应堆冷却剂水中引入气泡，有效地提取堆芯某处产生的裂变稀有气体~ <89>Kr和~ <138>Cs，并对它们各自的子体~ <89>Rb和~ <138>Cs进行高效计数，方法一是在滤纸上吸取反应堆贮箱中的气泡气体和空气覆盖的水，方法二是在水面上取样到瓶中的气泡气体的洗涤水中。研究了影响两种方法中子体探测效率的各种原因。这些包括引入气体的流速、气体在水中的出口位置（深度和径向）、冷却剂是否循环以及（对于方法II）取样和用水洗涤气体之间的取样气体的静置时间。根据这些实验数据，我们设计并建造了一套连续模式实验的燃料自动监测系统，该系统采用方法二，由在水面间歇取样鼓泡气体进入瓶中，将瓶送到探测器附近，静置一定时间，摇动瓶，测量水中所含的核素组成。该系统作为常规燃料监测系统，有效地测量了^<138>Cs。