Improvements in Quality of As-Manufactured Fuels for High-Temperature Gas-Cooled Reactors.

  • MINATO Kazuo
    Department of Chemistry and Fuel Research Japan Atomic Energy Research Institute
  • KIKUCHI Hironobu
    Department of Chemistry and Fuel Research Japan Atomic Energy Research Institute
  • TOBITA Tsutomu
    Department of Chemistry and Fuel Research Japan Atomic Energy Research Institute Department of HTTR Project Japan Atomic Energy Research Institute
  • FUKUDA Kousaku
    Department of Chemistry and Fuel Research Japan Atomic Energy Research Institute
  • KANEKO Mitsunobu
    Advanced Reactor Fuels Division Nuclear Fuel Industries Ltd. Nuclear Fuel Industries Ltd.,
  • SUZUKI Nobuyuki
    Advanced Reactor Fuels Division Nuclear Fuel Industries Ltd. Health Physics Safety & Maintenance Department Tokai Works Nuclear Fuel Industries Ltd.
  • YOSHIMUTA Shigeharu
    Advanced Reactor Fuels Division Nuclear Fuel Industries Ltd.
  • TOMIMOTO Hiroshi
    Advanced Reactor Fuels Division Nuclear Fuel Industries Ltd.

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  • Improvements in Quality of As-Manufactu

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The mechanisms of coating failure of the fuel particles for the high-temperature gas-cooled reactors during coating and compaction processes of the fuel fabrication were studied to determine a way to reduce the defective particle fraction of the as-manufactured fuels. Through the observation of the defective particles, it was found that the coating failure during the coating process was mainly caused by the strong mechanical shocks to the particles given by violent particle fluidization in the coater and by unloading and loading of the particles. The coating failure during the compaction process was probably related to the direct contact with neighboring particles in the fuel compacts. The coating process was improved by optimizing the mode of the particle fluidization and by developing the process without unloading and loading of the particles at intermediate coating process. The compaction process was improved by optimizing the combination of the pressing temperature and the pressing speed of the overcoated particles. Through these modifications of the fabrication process, the quality of the as-manufactured fuel compacts was improved outstandingly.

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