Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (2): 31 doi: 10.1007/s41365-016-0048-z

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Development of an innovative detection system for pebble bed kinematic studies

Ying Zhao 1,2, Shi-Xiang Qu 1, Xing-Wang Zhu 1, Shi-Wei Shao 1, Zhao-Zhong He 1, Kun Chen 1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Contact: Kun Chen E-mail:chenkun@sinap.ac.cn
  • Supported by:

    Supported by the ‘‘Strategic Priority Research Program’’ of the Chinese Academy of Sciences (Grant No. XDA02050100).

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Ying Zhao, Shi-Xiang Qu, Xing-Wang Zhu, Shi-Wei Shao, Zhao-Zhong He, Kun Chen. Development of an innovative detection system for pebble bed kinematic studies.Nuclear Science and Techniques, 2016, 27(2): 31     doi: 10.1007/s41365-016-0048-z
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Abstract:

Pebble bed reactors enable the circulation of pebble fuel elements when the reactors are in operation. This unique design helps to optimize the burnup and power distribution, reduces the excessive reactivity of the reactor, and provides a mean to identify and segregate damaged fuel elements during operation. The movement of the pebbles in the core, or the kinematics of the pebble bed, significantly affect the above features and is not fully understood. We designed and built a detection system that can measure 3-axis acceleration, 3-axis angular velocity, 3-axis rotation angles, and vibration and temperature of multiple pebbles anywhere in the pebble bed. This system uses pebble-shaped detectors that can flow with other pebbles and does not disturb the pebble movement. We used new technologies to enable instant response, precise measurement, and simultaneous collection of data from a large number of detectors. Our tests show that the detection system has a negligible zero drift and the accuracy is better than the designed value. The residence time of the pebbles in a moving pebble bed was also measured using the system.

Key words: Pebble bed, Nuclear reactor, Kinematics, RFID, Detector