検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

高燃焼度燃料被覆管のRIA時破損挙動評価に関する表面予き裂導入方法の開発

Development of pre-cracking method for evaluating the RIA failure behavior of high burn-up fuels

福田 拓司; 杉山 智之; 三原 武; 永瀬 文久

Fukuda, Takuji; Sugiyama, Tomoyuki; Mihara, Takeshi; Nagase, Fumihisa

高燃焼度燃料では酸化とそれに伴う水素吸収・水素化物析出が被覆管に生じる。被覆管の外表面近くに密に析出した水素化物は機械的に脆いためRIA時の被覆管肉厚貫通き裂進展の起点になりうると考えられる。き裂の起点となる外表面への水素化物析出を模擬するため、機械加工の影響を与えず予き裂を導入する方法として切削後圧延(Roll After Grooving:RAG)を開発し、被覆管の破損挙動に与える影響をEDC(Expansion Due to Compression)試験を用いて調べ切削加工によりき裂を導入した被覆管と比較した。RAGを施した被覆管は、高燃焼度燃料被覆管と同様に、比較的少ない周方向ひずみでき裂進展,破損に至り、RAGにより導入されたき列が貫通破損の起点として外表面近くに存在する水素化物を模擬できることが示された。

The hydride Precipitation occurs due to absorption of hydrogen and its oxidation in the high burn-up fuel cladding. The hydride precipitated densely near the outer surface of the cladding could be considered the origin of the crack growth its own brittle property. RAG (Roll After Grooving) has been developed to simulate the outer surface of hydride precipitation on the origin of the crack. The fracture behavior was evaluated to define the effect of origin of the crack compared with milled cladding by EDC (Expansion Due to Compression) test. The crack extension occurred in smaller circumferential strain on RAG cladding than milled cladding. It was shown that RAG can simulate the crack growth of outer surface hydride cracking.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.