8401.40.00.00 - Parts of nuclear reactors

HTS code 8401.40.00.00 specifically enumerates "Parts of nuclear reactors." This classification is intended for components, subassemblies, or individual items that are exclusively designed for use within nuclear reactors. These parts may include, but are not limited to, fuel element channels, control rod mechanisms, moderator components, reflectors, internal structural elements, and specialized piping or vessel parts unique to nuclear reactor construction. The classification hinges on the demonstrable integration and intended function of the part within the operational framework of a nuclear reactor.

This category is distinct from its sibling HTS codes within heading 8401. While 8401.10.00.00 covers the complete nuclear reactor itself, and 8401.30.00.00 pertains to non-irradiated fuel elements and their parts, 8401.40.00.00 focuses solely on the myriad of supporting components that constitute the reactor system, excluding the fuel assemblies. Furthermore, 8401.20.00.00 covers machinery and apparatus for isotopic separation, a different application altogether, thus distinguishing it from parts intended for nuclear power generation or research reactors.

As a leaf node, HTS code 8401.40.00.00 does not have further subdivisions. Classification under this code requires clear evidence that the part in question is manufactured and intended for incorporation into a nuclear reactor. General purpose machine parts or standard industrial components, even if potentially usable in a nuclear reactor, would not be classified here unless their design and specific characteristics render them exclusively for nuclear reactor application.