Development of Spectrum Shifter Region for Neutrons Produced in Nuclear Reactor through Critical Experiments

通过关键实验开发核反应堆产生的中子的谱移区

• 批准号: 07558282
• 负责人: SHIROYA Seiji
• 金额: $ 2.75万
• 依托单位: KYOTO 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-07558282/
• 关键词: Critical Experiments; Research Reactor; Spectrum Shifter Region; Fission Neutrons; Neutronics Design; Neutron Flux Distribution; Spectrum Index; Critical Assembly; 中性子スペクトル; 京都大学臨界集合体実験装置; 核計算; 研究炉; 光ファイバー検出器; 反射体

In accordance with a recent development in applied neutron science, the needs for so-called controlled neutrons are becoming stronger. To realize a spectrum-controlled irradiation field, it is desirable to establish a spectrum shifter region in research reactors.For this purpose, a basic and systematic study on the development of a spectrum shifter region in nuclear reactors was carried out through critical experiments at the Kyoto University Critical Assembly (KUCA). By using polyethylene moderated and reflected cores loaded with highly enriched uranium fuel, three cores of different moderator-to-fuel volume ratios with spectrum shifter regions, which consists of beryllium, graphite, aluminum or natural uranium, were constructed to measure the neutron flux, reaction rate, spectrum index (i.e.reaction rate ratio) distributions mainly by the activation wire method. The measured results were compared with the calculated ones by a neutronics code currently used in the neutronics design of research reactors.Through the KUCA experiments, it was demonstrated that the spectrum shifter region can be realized even in the reflector region of current research reactors, although the harder neutron spectrum in the core region would be much favorable for the higher performance. This fact indicates that, by selecting the material of reflector, it is possible to controll the slowing down process of fission neutrons to some extent.Finally, a neutronics design of the spectrum shifter region was performed on the basis of the present study in view of upgrading the Kyoto University Research Reactor (KUR).

根据最新应用中子科学的发展，所谓的受控中子的需求变得越来越强。为了实现频谱控制的辐射场，希望在研究反应器中建立一个光谱变速杆区域。为此，通过在京都大学关键组装（KUCA）的关键实验（KUCA）进行了一项核反应堆中光谱变速杆开发的基本和系统的研究。通过使用带有高浓缩铀燃料的聚乙烯温和和反射的岩心，将三个具有不同调节剂与燃料的体积比与光谱变速杆区域的核心，这些核心由孢子，石墨，石墨，铝或天然铀组成，以衡量中子升华，反应速率，分配速率。将测量结果与计算出的结果通过当前在研究反应器的中载设计中使用的中子码进行了比较。通过KUCA实验，即使在当前研究反应器的反射器中，频谱变速杆区域也可以实现，尽管核心区域中的中子频谱在较高的性能中也是如此。这一事实表明，通过选择反射器的材料，可以在一定程度上控制裂变中子的放缓过程。从本文中，鉴于本研究的基础进行了频谱变速杆区域的中间月设计，鉴于升级京都大学研究反应堆（KUR）。

项目成果

S.Shiroya: "Study on Research Reactor with Spectrum Shifter Region through Critical Experiments" KURRI Prog. Rep.1996. 68-68 (1997)

S.Shiroya：“通过关键实验研究具有频谱变换区域的研究堆”KURRI Prog。

Shigekazu Matsuura: "Measurement and Analysis of Reaction Rate Distributions of Cores with Spectrum Shifter Region" Ann.Rep.Res.Reactor Inst.Kyoto Univ.28. 1-12 (1995)

Shigekazu Matsuura：“具有谱移区域的核心反应速率分布的测量和分析”Ann.Rep.Res.Reactor Inst.Kyoto Univ.28。

S.Shiroya, H.Unesaki, T.Takeda, T.Kitada, O.Aizawa: "Study on Research Reactor with Spectrum Shifter Region through Critical Experiments" KURRI Prog.Rep.1996. 68-68 (1997)

S.Shiroya、H.Unesaki、T.Takeda、T.Kitada、O.Aizawa：“通过关键实验对具有频谱变换区域的研究堆进行研究”KURRI Prog.Rep.1996。

Seiji Shiroya: "Design Study of Spectrum Shifter Region in Research Reactor by Using the Kyoto University Critical Assembly(KUCA)" Int'l Conf.Neutrons in Research and Industry,June 9-15,1996,Crete,Greece,George Vourvopoulos,Ed.,Proc.SPIE. 2867. 525-528 (1

Seiji Shiroya：“Design Study of Spectrum Shifter Region in Research Reactor by using the Kenya University Critical Assembly (KUCA)” Intl Conf.Neutrons in Research and Industry，1996 年 6 月 9-15 日，希腊克里特岛，George Vourvopoulos，Ed

Seiji Shiroya, Hironobu Unesaki, Toshikazu Takeda and Otohiko: ""Design Study of Aizawa, "Spectrum Shifter Region in Research Reactor by Using the Kyoto University Critical Assembly (KUCA)"" Proc.Int'l Conf.Neutrons in Research and Industry, SPIE. Vol.286

Seiji Shiroya、Hironobu Unesaki、Toshikazu Takeda 和 Otohiko：“相泽的设计研究，“使用京都大学临界组件 (KUCA) 的研究堆中的频谱变换器区域””Proc.Intl Conf.Neutrons in Research and Industry，