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atomic reactor; nuclear reactor
原子炉の安全対策が見直された。
Safety measures for the nuclear reactor were reviewed.
古い原子炉を廃炉にする計画が発表された。
A plan to decommission the old nuclear reactor was announced.
原子炉の冷却に大量の水が必要だ。
Cooling a nuclear reactor requires a large amount of water.