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Burn-leach; The Most important test in the manufacture of HTGR fuel

燃焼-酸浸出法; 高温ガス炉燃料製造における最重要検査

Nabielek, H.*; Verfondern, K.*; Tang, C.*; 植田 祥平   

Nabielek, H.*; Verfondern, K.*; Tang, C.*; Ueta, Shohei

燃焼-酸浸出法は高温ガス炉燃料の品質を決定するうえで最も詳細な手法である。独国ではAVR用燃料製造において、燃料核,粒子及びオーバーコート粒子の全製造データを分析し、オーバーコート法を自動化することにより品質を向上できた。中国ではHTR-10用初装荷燃料として約2000個が製造され、初期の製造バッチにおいて改良の効果が認められた。日本ではHTTR用初装荷燃料の製造において、コンパクト中の粒子充填率がペブル型の10%に対し30%と遙かに高いにもかかわらず、低い破損率を達成した。これらの結果は、将来の二酸化ウラン核被覆燃料粒子の製造品質基準に寄与するものである。

Burn-leach is the most sensitive method for the determination of High-Temperature Gas-Cooled Reactor fuel quality. German fuel manufacture was for the operation of the 46 MWth AVR. Improvements in the fuel quality were due to perfected tabling of kernels, particles and overcoated particles and the introduction of automated overcoating. Chinese HTGR first load fuel manufacture around 2000 was for the operation of the 10 MWth HTR-10. An improvement can be observed after the first few production runs. Japanese HTGR first fuel manufacture was for the operation of the 30 MWth HTTR. The particle volume density of 30 % is much higher than the below 10 % of the spherical fuel elements. Nevertheless, very good results in terms of low defect fractions were also achieved. These results establish the quality standard in modern UO$$_{2}$$ Triso fuel.

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