Atomic Energy Science and Technology ›› 2021, Vol. 55 ›› Issue (11): 2087-2093.

### Simulation and Analysis on Spent Fuel Pebble Detection Scheme Based on γ Measurement in Pebble-bed High Temperature Gas-cooled Reactor

YIN Shiming;ZHANG Liguo;WANG Haitao

1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing 100084, China; The Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Beijing 100084, China
• Online:2021-11-20 Published:2021-11-20

### 基于γ测量的球床式高温气冷堆内乏燃料球探测方案的模拟分析

1. 清华大学 核能与新能源技术研究院，北京100084；清华大学 先进核能技术协同创新中心，北京100084；教育部先进反应堆工程与安全重点实验室，北京100084

Abstract: In pebble-bed high temperature gas-cooled reactor, the detection and number counting of the spent fuel pebbles discharged from the reactor core are the crucial part for fuel monitoring. To meet the requirement by IAEA for nuclear security of pebble-bed high temperature gas-cooled reactor, a new detection scheme based on a principle independent of the existent eddy current detection should be developed for fuel distinguishing and counting in the fuel handling system’s pipeline. Based on γ measurement, a novel detection scheme was proposed, a prototype of the detector was designed, and its function was examined when the reactor was in steady-state operation. With the radionuclides’ data from the reactor HTR-10, through Monte Carlo simulation and analysis for the process when pebbles of various velocities and burnups passing through the detecting area, the reliability of the scheme for the distinguishing and counting for single fuel pebble was verified. Meanwhile, the feasibility of this scheme to detect the pebble flow was preliminarily proved. The result provides the designing foundation for scheme’s improvement and device production in the future.