CPV code 42152200 designates Parts of nuclear-reactor vessels in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
42152200 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 42152000 (Parts of nuclear reactors).