Non-irradiated nuclear fuel elements require Nuclear Regulatory Commission authorization in addition to standard CBP entry. Importers must hold or operate under an NRC license covering the specific fuel type and must comply with any applicable Department of Energy agreements. Classification under 840130 does not substitute for these approvals.

Parts are classified with the article they are designed for: components specifically designed for a nuclear reactor (pressure vessels, control rod mechanisms, coolant pumps) fall under 840140, while parts dedicated to isotope-separation machinery classify under 840120. General-purpose industrial components that could serve either application may require a binding ruling to determine the correct subheading.