Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (3): 30603-030603.doi: 10.11889/j.0253-3219.2016.hjs.39.030603


Rotation angles and angular velocities study of pebble-shaped fuel element based on a detection system

ZHU Jianyu1,2, XU Xuefeng1, SU Jiahang1, XIE Wenxiong1   

  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
  • Received:2015-11-26 Revised:2016-01-27 Online:2016-03-10 Published:2016-03-11
  • Supported by:

    Supported by Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA02050100)


Background: Pebble Bed Reactor (PBR), most often used in Generation IV high-temperature gas-cooled nuclear reactor, employs pebble-shaped fuel elements. As pebbles flow through the reactor, they will slide and rotate against each other and the wall, causing generation of graphite dust. Purpose: This study aims to investigate the rotation angles and angular velocities of pebble-shaped fuel elements (PSFE). Methods: The rotation angle and angular velocity were studied by using a simulated transparent cylinder to replace the reactor core. A pebble-shaped detection system is employed to test the angular velocities and accumulated rotation angles of PSFEs with wireless interface. The generation of graphite particles by rotational abrasion was also studied. Results: The experimental results show that the initial seeding position has influence on rotation angles and angular velocities. The distribution of rotation angles and angular velocities from the center to the wall can be described as an inverted V-type distribution. The calculation results show that wear mass by rotation accounts for 11%-27% of the total graphite dust. Conclusion: Sliding abrasion is stronger than rotation abrasion in general, graphite generation tends to be overestimated if we only take sliding abrasion into consideration and ignore rotation abrasion.

Key words: Pebble-shaped fuel element, Rotation angles, Angular velocity, Rotation abrasion, Pebble-shaped detector system

CLC Number: 

  • TL37