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Comparing the Carbon Footprints of Low-Activity Radioactive Waste Immobilization Techniques

低レベル放射性廃棄物固定化技術の炭素フットプリント比較 (AI 翻訳)

Rothwell G

Research Squareプレプリント2026-07-30#エネルギー転換Origin: US経営インパクト: コスト削減対象セクター: waste_management
DOI: 10.20944/preprints202607.2208.v1
原典: https://doi.org/10.20944/preprints202607.2208.v1

🤖 gxceed AI 要約

日本語

ハンフォード核施設の低レベル放射性廃液処理について、ガラス固化とセメント固化（グラウト）の炭素フットプリントを比較。ガラス固化は1m3あたり約32tCO2e、グラウトは鉄道輸送で約2.5tCO2eと大幅に低く、鉄道スパー追加がネットゼロに重要と示す。

English

This study compares carbon footprints of vitrification versus grouting for low-activity radioactive waste at Hanford. Vitrification emits ~32 tCO2e/m3, while grouting with rail transport emits ~2.5 tCO2e/m3, highlighting rail infrastructure as key to net-zero waste treatment.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本の放射性廃棄物処理や産業廃棄物処理の脱炭素化に示唆。特にエネルギー多消費プロセスの代替技術評価は、日本のGX政策やカーボンフットプリント算定に参考になる。

In the global GX context

This paper provides a quantitative comparison of waste treatment technologies' carbon footprints, relevant to global decarbonization of industrial processes and waste management. It underscores the role of infrastructure choices (rail vs truck) in reducing emissions, applicable to broader logistics and industrial decarbonization.

👥 読者別の含意

🔬研究者:Waste treatment carbon accounting methodology and comparative LCA insights.

🏢実務担当者:Guidance on selecting low-carbon waste immobilization technologies and infrastructure investments.

🏛政策担当者:Evidence for incentivizing low-carbon waste treatment and rail infrastructure for emissions reduction.

📄 Abstract（原文）

Between 1943 and 1989, the Hanford Nuclear Site produced weapons-grade plutonium and accumulated 212,000 cubic meters of mixed radioactive and hazardous chemical waste, stored in 177 aging underground tanks. It is estimated that 90% of this waste is “Low Activity Waste” after the cesium, strontium, and transuranics are removed. In late 2025, the Direct Feed Low Activity Waste facility began vitrification, which involves mixing liquid waste with molten glass at 1150 °C to destroy hazardous organic chemicals, at an average rate of 15 metric tons per day. Maintaining heat in the two 300-ton melters requires about 200,000 megawatt-hours of electricity each year. Over 40 years, this electricity use results in about 3,000,000 tonnes of carbon dioxide emissions. To mitigate this carbon footprint, a significant portion of the waste could be “grouted” with a mixture of Portland cement, granulated slag, fly ash, and batch-specific chemicals. Vitrifying LAW has a carbon footprint of about 32 tCO2e per cubic meter (m3), whereas grouting LAW and shipping it out-of-state by truck involves about 6 tCO2e/m3, and shipping it by rail involves about 2.5 tCO2e/m3. Adding a rail spur to a grouting facility is key to Hanford’s net-zero approach.

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