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Japan Steel Works, Muroran
Muroran (Hokkaidō), Japan42.32°N 140.97°E
computed criticality18/100
reading
≈80% of the very largest nuclear forgings; ≈4 reactor vessels/year
2025Fault line
The vessels of large reactors require ingots of more than 600 tonnes forged in a single piece: Muroran and its 14,000-tonne presses hold a near-monopoly. Each forging cycle exceeds 18 months. The entire global nuclear revival, from Hinkley Point to the Polish projects, queues in front of a single Japanese press line.
Actors
Japan Steel Works (Tokyo / Muroran)
Doosan (Korea)
Sheffield Forgemasters
Feeds 1
Western PWR fleet, United States & EuropeNuclear↗Sources
World Nuclear News, JSW, 2024 ↗estimate