DEVELOPMENT OF CONTROL SYSTEM FOR THE FLOW RATE/PASSAGE OF TRITIUM WITH BREMSSTRAHLUNG COUNTING METHOD.

轫致辐射计数法氚流量/通过控制系统的开发。

• 批准号: 05558066
• 负责人: MATSUYAMA Masao
• 金额: $ 3.46万
• 依托单位: TOYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05558066/
• 关键词: TRITIUM; FUEL CYCLE OF THERMONUCLEAR FUSION; BREMSSTRAHLUNG COUNTING METHOD; IN-SITU MEASUREMENT; NON-DESTRUCTIVE MEASUREMENT; BERYLLIUM WINDOW; MULTIPLE MATERIAL; FLOW CONTROL SYSTEM

For tritium process in thermonuclear fusion reactors as well as a heavy water type reactor and the nuclear fuel reprocessing, it is indispensable to control the flow rate/passage of tritium according to the concentration of tritium. Especially, for the process of high level tritium, the development of precise control system for tritium is of a great importance from viewing point of safety. The applicability of a bremsstrahlung counting method to the insitu measurement of high level tritium has been examined so far. Since the penetration range of bremsstrahlung X-rays is remarkably greater than that of beta-rays, it is possible to measure directly the amount of tritium in a container attached with an appropriate window by the bremsstrahlung counting method. This method, therefore, will be a promising one to control the flow rate/passage of tritium.As a first step, to improve the sensitivity of bremsstrahlung counting method, the effect of a gold evaporated window on the intensity of bremsstrahlung X-rays has been examined. The window plays important roles of the confinement of tritium and the emission of the bremsstrahlung X-rays. By using the gold coating window, it was seen that the detection limit was extended toward lower tritium concentration of about 0.1 muCi/cm^3. In addition to the above examination, some preliminary experiments were carried out using an apparatus constructed to test the applicability of bremsstrahlung counting method to the control system. As a result, it was seen from the preliminary tests that two control valves attached to the present apparatus precisely operated at a given concentration irrespective to the flow rate in the range from 7 to 54 cm^3/min. From those results, it was revealed that it was possible to develop a tritium control system based on the bremsstrahlung counting method.

对于热核聚变反应堆、重水堆和核燃料后处理过程中的氚过程来说，根据氚的浓度控制氚的流量/通道是必不可少的。尤其是对于高放氚工艺，从安全的角度出发，开发出高精度的氚控制系统具有重要意义。到目前为止，已经考察了韧致辐射计数方法在高水平氚原位测量中的适用性。由于韧致辐射X射线的穿透范围比β射线大得多，因此可以用韧致辐射计数法直接测量装有适当窗口的容器中的氚含量。因此，这种方法将是一种很有前途的控制氚的流量/通道的方法。作为第一步，为了提高韧致辐射计数方法的灵敏度，我们考察了金蒸发窗口对韧致辐射X射线强度的影响。窗口对氚的限制和韧致辐射X射线的发射起着重要的作用。利用镀金窗口可以看到，探测下限扩展到了约0.1Muci/cm~3的较低氚浓度。除了上述检查之外，还利用为检验韧致辐射计数法对控制系统的适用性而建造的装置进行了初步实验。结果，从初步试验中可以看出，安装在本装置上的两个控制阀在给定的浓度下准确地工作，而不管流速在7至54 cm^3/min的范围内。从这些结果可以看出，开发一种基于韧致辐射计数方法的氚控制系统是可能的。

项目成果

M. MATSUYAMA: "Simple systems for measuring high concentration tritium." Proc. 2nd Japan/China Symposium on Mater. for Advanced New Energy Syotems and Fission and Fusion Engineering.187-193 (1994)

M. MATSUYAMA：“测量高浓度氚的简单系统。”

M. MATSUYAMA: "In-situ measurement of high level tritium by bremsstrahlung counting method. ( II) characteristics of a beryllium window." Ann. Rept. Hydrogen Isotope Res. Center,Toyama uniu.13. 51-61 (1993)

M. MATSUYAMA：“通过轫致辐射计数法对高水平氚进行原位测量。（II）铍窗的特性。”

Masao Matsuyama: "In-situ Measurement of High Level Tritium by Bremsstrahlung counting Method.(II)Characteristics of Beryllium Window." Ann.Report of Hydroopn Isot.Res,Center,Toyama Univ.13. (1993)

松山正雄：“轫致辐射计数法原位测量高水平氚。(II)铍窗的特性”。