Fukushima Daiichi Reactor 2 Debris Analysis Confirms Presence of Melted Fuel
Debris Weighs Less Than 0.7g, Shows Signs of Uranium and Fission Products
Following the trial retrieval of fuel debris from Reactor 2, detailed non-destructive analysis has confirmed the presence of melted nuclear fuel components, including europium (Eu-154) and americium (Am-241). These elements indicate that the sample contains remnants of uranium fuel that underwent nuclear fission before the meltdown.
The total weight of the retrieved debris is now confirmed to be 0.693g, slightly lower than previous estimates. The debris is a heterogeneous mixture of materials, primarily reddish-brown, with black and metallic-looking areas.
X-ray CT and Radiation Analysis Provide Further Insight
Advanced X-ray CT imaging revealed that the debris has an irregular structure, with voids dispersed throughout the sample. Gamma-ray spectrometry confirmed the presence of fission products such as Cs-137 (cesium), Co-60 (cobalt), and Eu-154 (europium), as well as actinides like Am-241 (americium), which originates from neutron capture in U-238.
Implications for Future Debris Removal
These results will help refine debris removal strategies, providing insight into fuel characteristics, criticality risks, and material hardness. Further analysis, including solid-state and chemical analysis, will continue over the next 6 to 12 months to aid in safer debris extraction and storage planning.
福島第一原発2号機の燃料デブリ分析—溶融核燃料成分を確認
重量0.7g未満のデブリからウラン・核分裂生成物を検出
福島第一原発2号機から試験的に取り出された燃料デブリの詳細分析が進み、燃料デブリには、核燃料由来の成分であるユーロピウム（Eu-154）やアメリシウム（Am-241）が含まれていることが確認されました。これらは、デブリに核燃料の溶融物が含まれていることを示しています。
また、デブリの総重量は0.693gと確定されました。サンプルは不均一な組成を持ち、全体的に赤褐色で、一部に黒色や金属光沢を帯びた部分が見られました。
X線CTと放射線分析が詳細なデータを提供
X線CT撮影により、デブリ内部には多くの空隙が存在することが判明しました。また、γ線スペクトロメトリの分析では、Cs-137（セシウム）、Co-60（コバルト）、Eu-154（ユーロピウム）といった核分裂生成物に加え、U-238の中性子捕獲によって生成されたAm-241（アメリシウム）も検出されました。
今後の燃料デブリ取り出しに向けた影響
今回の分析結果は、今後の燃料デブリ取り出し計画に重要な知見を提供します。特に、燃料の特性、臨界リスク、硬度などの要素が、安全なデブリ取り出し方法の選定に役立つと期待されています。さらに、固体・溶液分析を含む詳細解析が今後6ヶ月から1年かけて実施される予定です。
Photo ; Nuclear debris collected from the reactor 2
Source: https://fukushima-diary.com/2025/02/fukushima-daiichi-reactor-2-debris-analysis-confirms-presence-of-melted-fuel/
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