| 高浓铀金属临界装置缓发中子有效份额测量 |
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| 引用本文： | 温左蔚,范晓强,尹延朋,蒋勇,连玄.高浓铀金属临界装置缓发中子有效份额测量[J].强激光与粒子束,2015,27(9):096002. |
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| 作者姓名： | 温左蔚 范晓强 尹延朋 蒋勇 连玄 |
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| 作者单位： | 1.中国工程物理研究院 核物理与化学研究所, 四川 绵阳 621 900; |
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| 摘 要： | 缓发中子有效份额βeff是反应堆动态特性的重要参数,也是相对反应性与绝对反应性之间的转换桥梁,对于以反应性作为宏观参数的检验工作具有重要意义。测量采用基于Rossi-α方法的Nelson数法开展了快临界装置βeff的实验研究。通过采用铅屏蔽、更薄的6Li玻璃闪烁体、脉冲幅度甄别三种措施,降低了γ射线对测量的影响。实验中测量了反应堆从-60￠到缓发临界之间的7个状态,最终测量得到βeff值为0.006 66,不确定度为7.88%;与理论计算数值偏差为2.15%。测量结果与理论值符合良好,表明了测量方法的有效性。
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| 关 键 词： | 缓发中子有效份额 Rossi-α方法 Nelson数法 n-γ分辨 |
| 收稿时间： | 2015-05-22 |
Measurement of effective delayed neutron fraction in highly enriched uranium metal critical assembly |
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| Affiliation: | 1.Institute of Nuclear Physics and Chemistry,CAEP,Mianyang 621900,China;2.Key Laboratory of Neutron Physics,CAEP,Mianyang 621900,China |
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| Abstract: | Effective delayed neutron fraction eff is an important parameter in dynamic behaviour of nuclear reactor. Besides, eff has the role of the conversion factor between a relative unit and an absolute unit in reactivity scale, which is important for examining work of macroparameter according to reactivity. An experiment was performed to measure theeff in a fast critical assembly using Nelson number method which is based on Rossi- method. Using lead for shielding, adopting the thinner 6Li glass scintillator and pulse amplitude discrimination, the influence of is decreased. The measurements were carried out for reactivity ranging from -60 ￠ to delayed critical state. The final measured value ofeff is 0.006 66, with 7.88% uncertainty, of which the deviation is 2.15% compared with the theoretical value. Because of the good matching between the measured value and the theoretical value, the experiment method is demonstrated to be effective. |
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