noun
fuel debris (esp. nuclear)
Technical term for the solidified mixture of melted nuclear fuel and reactor materials formed during a severe nuclear accident.
福島第一原発では、燃料デブリの取り出しが最大の課題となっている。
At the Fukushima Daiichi nuclear plant, removing fuel debris is the biggest challenge.
A broader term for debris or fragments in various contexts (space, disaster, etc.), while 燃料デブリ specifically refers to nuclear fuel debris.
Compound of 燃料 (fuel) and デブリ (debris), a loanword from English. The term became widely used after the Fukushima Daiichi nuclear disaster.