Chapter 8401 — Customs Tariff Headings

8401.20.00Machinery and apparatus for isotopic separation, and parts thereof

8401.30.00Fuel elements (cartridges), non-irradiated

8401.40.00Parts of nuclear reactors

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Products classified under Tariff item 84.01

AP1000 Advanced Passive Nuclear Reactor

The AP1000 is a Generation III+ pressurized water nuclear reactor with passive safety systems that rely on natural forces such as gravity and convection. As a complete nuclear reactor designed for commercial power generation, it falls squarely under tariff item 8401.10.00, which covers nuclear reactors.

BWR Boiling Water Nuclear Reactor

A Boiling Water Reactor (BWR) is a nuclear reactor type where water boils directly in the reactor core, producing steam that drives turbines for electricity generation. As a complete nuclear reactor system, it is classified under tariff item 8401.10.00, which covers nuclear reactors.

CANDU Heavy Water Nuclear Reactor

The CANDU reactor is a Canadian-designed nuclear reactor that uses heavy water as both moderator and coolant, allowing it to operate with natural uranium fuel. As a complete nuclear reactor system, it is classified under tariff item 8401.10.00, which covers nuclear reactors.

PWR Pressurized Water Nuclear Reactor

A Pressurized Water Reactor (PWR) is a nuclear reactor type where water is kept under high pressure to prevent boiling, serving as both coolant and moderator. As a complete nuclear reactor for power generation, it falls under tariff item 8401.10.00, which covers nuclear reactors.

RBMK Graphite Moderated Nuclear Reactor

The RBMK is a graphite-moderated nuclear reactor design that uses light water as a coolant, historically used in Soviet-era power plants. As a complete nuclear reactor, it is classified under tariff item 8401.10.00, which covers nuclear reactors.

SMR Small Modular Nuclear Reactor

Small Modular Reactors (SMRs) are factory-built nuclear reactors with a power output of less than 300 MWe, designed for modular deployment. As complete nuclear reactors, they are classified under tariff item 8401.10.00, which covers nuclear reactors.

VVER Russian Pressurized Water Reactor

The VVER is a Russian-designed pressurized water nuclear reactor used in many Eastern European power plants. As a complete nuclear reactor for power generation, it falls under tariff item 8401.10.00, which covers nuclear reactors.

Calutron Electromagnetic Separator

> A calutron electromagnetic separator is a device that ionizes a material and uses magnetic fields to deflect ions of different masses along distinct paths, enabling the collection of separated isotopes. It is dedicated apparatus for isotopic separation, falling squarely under tariff item 8401.20.00.

Cascade Gas Centrifuge Assembly

> A cascade gas centrifuge assembly is an integrated bank of gas centrifuges connected in series to achieve high isotopic separation factors, typically for uranium enrichment. As a complete, interconnected system designed solely for isotopic separation, it is classified under tariff item 8401.20.00.

Cryogenic Isotope Separator Pump

A cryogenic isotope separator pump engineered to transfer liquefied isotopic gases at low temperatures without fractionation or contamination. It is a component integral to isotopic separation machinery, qualifying under tariff item 8401.20.00 as a part thereof.

Gas Centrifuge for Uranium Enrichment

> A gas centrifuge for uranium enrichment is a high-speed rotating machine that uses centrifugal force to separate uranium isotopes U-235 and U-238 in gaseous UF6 form. It is specialized apparatus for isotopic separation and therefore falls under tariff item 8401.20.00.

Gaseous Diffusion Barrier Modules

> Gaseous diffusion barrier modules are porous membrane units that enable selective diffusion of lighter isotopes through microscopic pores in UF6 gas streams. They are integral parts of isotopic separation apparatus and are classified under tariff item 8401.20.00 as parts thereof.

Heavy Water Distillation Column

> A heavy water distillation column is a fractional distillation apparatus designed to separate deuterium from protium in water vapor streams based on boiling point differences. It is dedicated machinery for isotopic separation and falls under tariff item 8401.20.00.

Laser Isotope Separation System

> A laser isotope separation system uses precisely tuned lasers to selectively excite and ionize specific isotopes for separation, often applied to uranium or heavy water production. It is apparatus dedicated to isotopic separation and is classified under tariff item 8401.20.00.

UF6 Gas Handling Manifold for Centrifuges

> A UF6 gas handling manifold for centrifuges is a specialized valve and piping assembly used to feed, enrich, and withdraw uranium hexafluoride gas in centrifuge cascades. It is a part of isotopic separation apparatus and falls under tariff item 8401.20.00.

Fuel Element End Plug Assembly

> This welded end cap assembly, made of zirconium alloy, is designed to seal non-irradiated nuclear fuel cartridges. It prevents gas release and maintains the structural integrity of the fuel element, ensuring safe handling and reactor performance. As a component integral to the fuel cartridge, it is classified under this tariff item.

MOX Plutonium-Uranium Fuel Cartridge

> This non-irradiated mixed oxide (MOX) fuel cartridge combines plutonium and uranium oxides in pellet form within metal cladding, designed for light water reactors. It is a complete fuel element ready for reactor loading, falling squarely under the tariff item for non-irradiated fuel elements.

Silicon Carbide TRISO Fuel Particle Cartridge

> This non-irradiated TRISO fuel cartridge contains thousands of silicon carbide-coated uranium oxide or carbide particles embedded in a graphite matrix, designed for high-temperature gas reactors. It is a complete fuel element, classified under the tariff item for non-irradiated fuel elements.

Uranium Dioxide Fuel Pellet Cartridge

> This non-irradiated fuel element cartridge contains pressed uranium dioxide (UO2) pellets encased in zirconium alloy cladding, designed for insertion into nuclear reactor cores. It is a complete fuel element, directly matching the description of this tariff item.

Zircaloy-4 Fuel Cladding Spacer Grid

> This Zircaloy-4 spacer grid assembly positions and supports fuel rods within nuclear fuel cartridges, maintaining coolant flow spacing. While it is a component, it is essential to the structure of the fuel element and is classified as a part of non-irradiated fuel elements under this tariff item.

ZIRLO Fuel Rod Cladding Tube

> This precision zirconium-niobium alloy (ZIRLO) tube serves as the protective cladding for nuclear fuel pellets in non-irradiated fuel elements. It is a critical component of the fuel cartridge, classified under this tariff item as a part of non-irradiated fuel elements.

Containment Penetration Sleeve

A containment penetration sleeve is a pressure-tight, seismic-qualified assembly that allows piping and cabling to pass through the reactor containment structure while maintaining the integrity of the containment barrier. It is an essential safety component of a nuclear reactor, as it ensures the containment remains leak-tight under normal and accident conditions. This sleeve is classified under tariff item 8401.40.00 as a part of nuclear reactors.

Control Rod Drive Mechanism Housing

A control rod drive mechanism housing is a pressure-tight enclosure that contains the mechanisms used to insert and withdraw control rods, thereby regulating the nuclear fission rate in a reactor. It is a critical component of the reactor's reactivity control system and is designed to withstand high pressures and temperatures. This housing is classified under tariff item 8401.40.00 as a part of nuclear reactors.

Core Support Barrel

A core support barrel is a cylindrical structure that positions the reactor core within the pressure vessel and directs coolant flow in pressurized water reactors (PWRs). It is a fundamental reactor internal that ensures proper core alignment and thermal-hydraulic performance. This barrel is classified under tariff item 8401.40.00 as a part of nuclear reactors.

Nuclear Fuel Assembly Flow Skirt

A nuclear fuel assembly flow skirt is a bottom flow distributor attached to fuel assemblies to ensure proper coolant distribution across the core. It is a reactor-specific component designed to optimize thermal-hydraulic performance and is supplied as a replacement part for nuclear reactors. This skirt is classified under tariff item 8401.40.00 as a part of nuclear reactors.

Nuclear Reactor Internals Upper Guide Structure

A nuclear reactor internals upper guide structure is a lattice framework installed above the reactor core to align and guide control rods and fuel assemblies during refueling operations. It is a critical reactor internal that ensures precise positioning and safe operation. This guide structure is classified under tariff item 8401.40.00 as a part of nuclear reactors.

Nuclear Reactor Pressure Vessel

A nuclear reactor pressure vessel is a massive cylindrical steel vessel designed to contain the reactor core, coolant, and heat generated during nuclear fission in a pressurized water reactor (PWR). It is a critical structural component that ensures the safe containment of the reactor. This vessel is classified under tariff item 8401.40.00 as a part of nuclear reactors.

Reactor Coolant Pump Casing

A reactor coolant pump casing is a high-pressure casing that houses the impeller of primary coolant circulation pumps in nuclear power plants. It is part of the reactor coolant pressure boundary and is essential for maintaining coolant flow. This casing is classified under tariff item 8401.40.00 as a part of nuclear reactors.

Reactor Core Shroud

A reactor core shroud is a stainless steel cylindrical assembly that surrounds the nuclear fuel assemblies in boiling water reactors (BWRs), directing coolant flow and providing radiation shielding. It is a reactor-specific component that ensures proper core cooling and safety. This shroud is classified under tariff item 8401.40.00 as a part of nuclear reactors.

Reactor Vessel Head Penetration Adapter

A reactor vessel head penetration adapter is a forged adapter that provides pressure-tight seals for control rod drive mechanisms penetrating the reactor vessel head. It is essential for maintaining vessel integrity and ensuring safe reactor operation. This adapter is classified under tariff item 8401.40.00 as a part of nuclear reactors.