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首页> 外文期刊>Nuclear Engineering and Design >Investigative studies on the effects of cadmium rabbits on high enriched uranium-fueled and low enriched uranium-fueled cores of Ghana Research Reactor-1 using MCNP5 code
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Investigative studies on the effects of cadmium rabbits on high enriched uranium-fueled and low enriched uranium-fueled cores of Ghana Research Reactor-1 using MCNP5 code

机译：使用MCNP5代码对镉兔对加纳研究堆1的高浓铀燃料和低浓铀燃料堆芯的影响进行研究

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摘要

Miniature Neutron Source Reactors (MNSRs) are noted to be among highly safe research reactors. However, because of its use of one control rod for reactivity control and shutdown purposes, alternative methods of shutting it down are important. The Ghana MNSR uses four cadmium rabbits of approximate dimensions 6.5 cm × 5.0 cm × 0.1 cm and mass of 9.48 g each to emergently shut down the reactor. The Monte Carlo N-Particle code; version 5, (MCNP5) was used to design the high enriched uranium (HEU) and low enriched uranium (LEU) cores of the MNSR with four cadmium rabbits inserted in four inner irradiation sites of each core. The operating parameters and shutdown parameters for both cores with the central control rod (CCR) either fully withdrawn or fully inserted had similar results with the HEU core having slightly better results in terms of safety. However, the results show that the four inserted cadmium rabbits make the HEU core subcritical whiles in the LEU core, it still remains critical (K_(eff)= 1.00005±0.00007). The length of the cadmium material in each cadmium rabbit must therefore be increased by at least 0.5 cm in order to attain subcriticality (K_(eff) = 0.99989 ±0.00006) and shutdown margin of 0.11 mk when inserted in the LEU core.
机译：微型中子源反应堆（MNSR）被认为是高度安全的研究反应堆之一。但是，由于将一根控制棒用于反应性控制和关闭目的，因此关闭它的替代方法很重要。加纳MNSR使用四只尺寸约6.5厘米×5.0厘米×0.1厘米，质量为9.48克的镉兔子紧急关闭反应堆。蒙特卡洛N粒子代码；版本5（MCNP5）用于设计MNSR的高浓缩铀（HEU）和低浓缩铀（LEU）核心，并在每个核心的四个内部照射位置中插入四只镉兔子。带有中央控制杆（CCR）的两个铁芯（完全抽出或完全插入）的操作参数和停机参数具有相似的结果，而HEU铁芯在安全性方面的结果要好一些。然而，结果表明，四只插入的镉兔使HEU核处于亚临界状态，而在LEU核中仍保持临界状态（K_（eff）= 1.00005±0.00007）。因此，每只镉兔中的镉材料长度必须增加至少0.5 cm，以便在插入LEU堆芯时获得亚临界（K_（eff）= 0.99989±0.00006）和关闭裕度为0.11 mk。

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  • 来源
    《Nuclear Engineering and Design》 |2013年第12期|514-518|共5页
  • 作者

    J. Boffie; E.H.K. Akaho; B.J.B. Nyarko; H.C. Odoi; K. Tuffour-Achampong; R.G. Abrefah;

  • 作者单位

    Department of Nuclear Engineering & Material Science, School of Nuclear and Allied Sciences (SNAS),University of Ghana, P.O. Box AE 1, Atomic Energy, Accra, Ghana,National Nuclear Research Institute, Ghana Atomic Energy Commission, P.O. Box LG 80, Legon, Accra, Ghana;

    Department of Nuclear Engineering & Material Science, School of Nuclear and Allied Sciences (SNAS),University of Ghana, P.O. Box AE 1, Atomic Energy, Accra, Ghana;

    Department of Nuclear Engineering & Material Science, School of Nuclear and Allied Sciences (SNAS),University of Ghana, P.O. Box AE 1, Atomic Energy, Accra, Ghana,National Nuclear Research Institute, Ghana Atomic Energy Commission, P.O. Box LG 80, Legon, Accra, Ghana;

    Department of Nuclear Engineering & Material Science, School of Nuclear and Allied Sciences (SNAS),University of Ghana, P.O. Box AE 1, Atomic Energy, Accra, Ghana,National Nuclear Research Institute, Ghana Atomic Energy Commission, P.O. Box LG 80, Legon, Accra, Ghana;

    Department of Nuclear Engineering & Material Science, School of Nuclear and Allied Sciences (SNAS),University of Ghana, P.O. Box AE 1, Atomic Energy, Accra, Ghana,National Nuclear Research Institute, Ghana Atomic Energy Commission, P.O. Box LG 80, Legon, Accra, Ghana;

    Department of Nuclear Engineering & Material Science, School of Nuclear and Allied Sciences (SNAS),University of Ghana, P.O. Box AE 1, Atomic Energy, Accra, Ghana,National Nuclear Research Institute, Ghana Atomic Energy Commission, P.O. Box LG 80, Legon, Accra, Ghana;

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