報告書番号

282004

タイトル（和文）

付着残留ナトリウム量の評価（その２）─燃料バケット牽引部材のナトリウム付着試験─

タイトル（英文）

RESIDUAL SODIUM DEPOSITS ON HOISTING MATERIALS FOR FUEL TRANSFER BUCKETS

概要 （図表や脚注は「報告書全文」に掲載しております）

ＦＢＲプラントの燃料移送設備において使用さる燃料バケット牽引部材を対象にナトリウム付着試験を行った。試験はワイヤロープ，テープ，ショートリンクチェーンおよびローラーチェーンの４形状の候補部材について行い，ナトリウムの付着量，ナトリウムの洗浄性，部材の屈曲性なとについて比較評価をした。この結果，ナトリウムの付着量が少なく，かつ，ナトリウム付着後も燃料バケット牽引部材として要求される性能低下を起こしにくい部材を総合的に評価するとショートリンクチェーンにその優位性が見られた。

概要 （英文）

A SERIES OF IN-SODIUM EXPERIMENTS WAS CONDUCTED TO COMPARE THE AMOUNTS OF RESIDUAL SODIUM DEPOSITS BETWEEN FOUR TYPES OF HOISTING MATERISLS FOR LMFBR FUEL TRANSFER BUCKETS AFTER DRAININGSODIUM.CLEANABILITIES OF THE RESIDUAL SODIUM BY ETHYL ALCOHOL WERE ALSO COMPARED BETWEEN THEM. THE TYPES OF MATERIALS COMPARED WERE SHORT LINK CHAIN,ROLLER CHAIN,WIRE ROPE AND STEEL TAPE.SODIUM TEMPERATURE OF 180DEGREE WAS CHOSEN IN ACCORDANCE WITH THE REFUELING CONDITION,AND COOLING RATE WAS TAKEN AS A PARAMETER. IMPORTANT FINDINGS FROM THESE EXPERIMENTS ARE, (1)THE AMOUNT OF RESIDUAL SODIUM DEPOSITS ON THE ROLLER CHAINS WERE LARGER THAN THOSE ON THE OTHER MATERIAL BY FACTOR OF THREE TO FOUR. (2)THE IMPEDIMENTS IN FLEXIBILITY BY FROZEN SODIUM WERE OBSERVED INTHE ROLLER CHAINS AND WIRE ROPES. (3)THE SHORT LINK CHAINS AND STEEL TAPES SHOWED GOOD CLEANABILITY OF SODIUM BECAUSE OF THEIR SIMPLE CONFIGURATIONS. REFERING TO THESE RESULTS,THE SHORT LINK CHAIN WAS RECOMMENDEDFOR THE HOISTING MATERIALS FROM THE VIEWPOINT OF OPERABILITY,MAINTAINABILITY AND RELIABILITY.

報告者

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