{
  "scope": "Global civil nuclear equipment and services",
  "cutoff": "2026-10-13",
  "note": "Category links, not contracts; company examples are not exhaustive or ranked.",
  "hierarchy": [
    {
      "stage": "Upstream",
      "segments": [
        {
          "segment": "Uranium feed and conversion",
          "examples": [
            "Cameco · Orano"
          ]
        },
        {
          "segment": "Enrichment services",
          "examples": [
            "Urenco · Orano",
            "Rosatom · CNNC"
          ]
        },
        {
          "segment": "Nuclear castings and forgings",
          "examples": [
            "Doosan Enerbility"
          ]
        },
        {
          "segment": "Fuel assemblies",
          "examples": [
            "Westinghouse · Framatome"
          ]
        }
      ]
    },
    {
      "stage": "Midstream",
      "segments": [
        {
          "segment": "Reactor systems",
          "examples": [
            "Westinghouse · Rosatom",
            "GE Vernova Hitachi"
          ]
        },
        {
          "segment": "Nuclear island components",
          "examples": [
            "Framatome · Doosan",
            "BWXT"
          ]
        },
        {
          "segment": "Steam turbines and generators",
          "examples": [
            "Arabelle Solutions · Doosan"
          ]
        },
        {
          "segment": "Controls and construction",
          "examples": [
            "I&C: Framatome · Curtiss-Wright",
            "EPC: Bechtel"
          ]
        }
      ]
    },
    {
      "stage": "Downstream",
      "segments": [
        {
          "segment": "Outage and maintenance",
          "examples": [
            "Westinghouse · Framatome"
          ]
        },
        {
          "segment": "Testing and inspection",
          "examples": [
            "BWXT · Kinectrics",
            "Curtiss-Wright"
          ]
        },
        {
          "segment": "Operating life extension",
          "examples": [
            "Framatome · Westinghouse"
          ]
        },
        {
          "segment": "Waste and decommissioning",
          "examples": [
            "Orano"
          ]
        }
      ]
    }
  ]
}