Atomic Energy Science and Technology ›› 2021, Vol. 55 ›› Issue (4): 577-583.DOI: 10.7538/yzk.2020.youxian.0737

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First Physics Start-up of Lead Core of Venus-Ⅱ Zero Power Reactor

ZHU Qingfu;ZHOU Qi;XIA Zhaodong;LIU Yang;ZHANG Wei;LUO Huangda;CHEN Xiaoliang;WANG Fan;CHEN Xiaoxian;LIU Feng;LIU Donghai   

  1. Division of Reactor Engineering Technology Research, China Institute of Atomic Energy, Beijing 102413, China
  • Online:2021-04-20 Published:2021-04-20

启明星Ⅱ号零功率装置铅堆堆芯首次物理启动

朱庆福;周琦;夏兆东;刘洋;张巍;罗皇达;陈晓亮;王璠;陈效先;刘锋;刘东海   

  1. 中国原子能科学研究院 反应堆工程技术研究部,北京102413

Abstract:

First physics start-up of the lead core of Venus-Ⅱ aims to load the nuclear fuel elements into the lead core which is the first zero power reactor for lead-cooled fast reactor in China, and confirm the safety characteristics of the core. The lead core uses two kinds of nuclear fuel elements. The number of fuel elements in critical is large. The reactivity worth of fuel elements in different locations is widely dissimilar. In considering these features, the initial neutron source and neutron monitoring detectors were carefully selected and validated in first physics start-up, the influence in neutron scattering and absorbing by simulacrum elements was evaluated and a specific loading pattern with sub-zone extrapolation was formulated. According to the loading pattern, the lead core completed fuel loading and reached critical safely. The reactivity of simulacrum elements, fuel elements, safety rod and adjust rod was measured. This work provides important experimental parameters and critical loading pattern for subsequent experiments.

Key words: Venus-Ⅱ, lead core, physics start-up, loading extrapolation, reactivity measurement

摘要:

启明星Ⅱ号铅堆堆芯的首次物理启动旨在完成国内首座铅冷快堆零功率装置的装料与达临界,掌握堆芯安全特性。考虑铅堆堆芯使用两种燃料元件,临界元件数量较大,不同区域的中子能谱与燃料元件价值差异大的特点,首次物理启动对启动中子源与中子计数探测器进行了选取与验证,评价了模拟元件对中子的散射与吸收的影响,制定了分区外推的装料方案。按照装料方案,铅堆堆芯完成了装料,安全实现了首次临界,测量了模拟元件、燃料元件、安全棒和调节棒反应性。本文工作为后续实验运行提供了重要的实验参数与临界装载方案。

关键词: 启明星Ⅱ号, 铅堆堆芯, 物理启动, 装料外推, 反应性测量