報告書番号

W97029

タイトル（和文）

アークプラズマによるジルカロイ廃材の溶融

タイトル（英文）

ARC PLASMA MELTING OF ZIRUCALOY WASTE

概要 （図表や脚注は「報告書全文」に掲載しております）

高融点で一般に溶融が困難なジルカロイ廃材をアークプラズマ加熱により溶融し，溶融手順，添加物，加熱雰囲気が溶融に与える影響について明らかにした。ジルカロイを少量づつ短時間加熱する「非水冷るつぼを用いた逐次溶融法」を用いることにより，ダストの発生量と処理エネルギーを低減できることが分かった。

概要 （英文）

AMONG THE VARIOUS REPROCESSING WASTES LIKELYTO BE GENERATED BY FUTURE NUCLEAR FUEL CYCLES, THE VOLUME OF HULLS ANDEND-PIE SES OF CLADDED FUEL STRUCTURE S EGMENTS MUST BE REDUCED. ALTHOU GH ARC PLASMA MELTING HAS BEEN CONSIDERED A POSSIBLE METHOD, Z IRCALOY, A MAJOR HULL COMPONENT , HAS AN EXTREMELY HIGH MELTING POINT, AND EXPERIMENTAL VERIFI CATION OF ARC PLASMA MELTING HA S YET TO BE COMPLETEDIN JAPAN. IN THIS STUDY, WE PERFORMED ME LTING AND SOLIDIFICATION EXPERI MENTS IN ASMALL-SIZED ARC PLASM A MELTING FURNACE CONTAINING A GRAPHITE CRUCIBLE, USING UNUSED ZIRCALOY WASTE AS SIMULATED HU LL MATERIAL. ITS MELTING BEHAVI OR WAS STUDIED WITH RESPECT TO THE FOLLOWING PARAMETERS:THE RE QUIRED HEATING ENERGY AND HEATI NG ATMOSPHERE, AND THE METHOD O F INTRODUCTION OF THE WASTE INT O THE FURNACE. THE STUDY SHOWED THAT FOR EFFICIENT MELTING, A SMALL AMOUNT OF WASTE AT A TIME SHOULD BE INTRODUCED INTO A NO NWATER-COOLED CRUCIBLE FROM THE TOP AND THAT THE WASTE SHOULD BE BRIFLY EXPOSED TO PLASMA SO THAT THE AMOUNT INTRODUCED MELT S AND SOLIDIFIES FROM THE THE B OTTOM OF THE CRUCIBLE.

報告者

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