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剪断試験装置(II)剪断試験報告書

Fuel bundle shearing test using shearing test apparatus (II)

中川 林司; 小島 久雄; 林 正太郎

Nakagawa, Rinshi; Ojima, Hisao; Hayashi, Shotaro

本報告書は,第二応用試験棟内に設置されているせん断試験装置(II)のせん断試験に関して報告するものである。試験は昭和59年12月から昭和60年3月に行なわれたもので,以下の3項目について評価したものである。1.せん断片の長さを一定化する方法の検討2.燃料ピン束のせん断特性把握3.せん断片の溶解槽バスケット装荷時の特性把握 これらの試験はすべてFBR"もんじゅ"炉心模擬燃料ピン束を用いたコールド試験である。本試験によって以下の結果を得た。1.特に装置の改造をしなくても特殊なせん断刃を使用する事でせん断片の長さは一定化出来る。2.プレナムせん断片の開口率は0%に近く,Na不活性化処理方法の見直しが必要となる他.ピン束最終端部(プレナム部で約20cm)のせん断機からの回収は不可能であった。3.溶解槽バレルとバスケットの隙間にせん断されたラッピングワイヤー片が数本入り込みバスケット吊り上げ時の障害となる。

The present report describes the result of fuel bundle shearing test using shearing test apparatus (II) in the 2nd EDF to establish the adequate shearing system for FBR fuel recycling pilot plant. Main test items were as follows; (1)Obtain the method to get the fuel segments with constant length. (2)Get the characterization about the bundle-shear of FBR fuel by shearing machine. (3)Confirm the fuel segments loading system from the shearing machine to the dissolver via distributor and chute. The tests have been carried out with dummy fuel assemblies of Monju core, which were consisted of Al$$_{2}$$O$$_{3}$$ sintered pellets and stainless steel cladding tube. As the results, the following informations have been abtained. (1)The fuel segments with constant length could be obtained by only using a blade with special structure. Some modifications of the apparatus were not necessary. (2)It was obserbed that the open area portion of segment from plenum part shearing was nearly 0%, so that the method of sodium disactivation should be improved. And the final shearing part (about 20cm of plenum part) could not be recovered from the shearing apparatus and not be loaded to the dissolver. (3)Choped wrapping wire became an obstacle for lifting up the hull basket, because some pieces entered in the clearance between basket and barrel.

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