Who makes components for AI data centers

Whatever reactor design eventually gets built, someone has to forge the pressure vessel, make the internals, and supply the pumps, valves and instrumentation that go inside the nuclear island. This part is that manufacturing base, and it is the constraint that the reactor design conversation tends to skip past. Nuclear-grade manufacturing is a qualification regime as much as a capability. Heavy forging for pressure vessels sits with a small number of facilities worldwide, code stamps and quality programmes take years to establish, and the welders and inspectors are a workforce that shrank through decades of low order volume. A modular reactor programme intending to build many identical units is making a bet on factory production that this supply base has not done at volume in living memory. That is precisely the bet worth examining. The economic case for small modular reactors rests on repetition — build the same unit many times and drive the cost down — and repetition requires a component supply chain able to deliver in series. What to look for is which suppliers hold current nuclear quality certifications rather than historical ones, whether capacity is being added, and how much of a given reactor design's content is nuclear-grade at all, since some advanced designs deliberately move components outside the nuclear boundary to escape this bottleneck.