- List
- NSG – Trigger List (Part 1) – INFCIRC/254/Rev.15/Part 1 (21 April 2026)
INTRODUCTORY NOTE
In the electromagnetic process, uranium metal ions produced by ionisation of a salt feed material (typically uranium tetrachloride (UCl₄)) are accelerated and passed through a magnetic field that has the effect of causing the ions of different isotopes to follow different paths. The major components of an electromagnetic isotope separator include: a magnetic field for ion-beam diversion/separation of the isotopes, an ion source with its acceleration system, and a collection system for the separated ions. Auxiliary systems for the process include the magnet power supply system, the ion source highvoltage power supply system, the vacuum system, and extensive chemical handling systems for recovery of product and cleaning/recycling of components.
5.9.1. Electromagnetic isotope separators
Electromagnetic isotope separators especially designed or prepared for the separation of uranium isotopes, and equipment and components therefor, including:
(a) Ion sources
Especially designed or prepared single or multiple uranium ion sources consisting of a vapour source, ioniser, and beam accelerator, constructed of suitable materials such as graphite, stainless steel, or copper, and capable of providing a total ion beam current of 50 mA or greater.
(b) Ion collectors
Collector plates consisting of two or more slits and pockets especially designed or prepared for collection of enriched and depleted uranium ion beams and constructed of suitable materials such as graphite or stainless steel.
(c) Vacuum housings
Especially designed or prepared vacuum housings for uranium electromagnetic separators, constructed of suitable non-magnetic materials such as stainless steel and designed for operation at pressures of 0.1 Pa or lower.
EXPLANATORY NOTE
The housings are specially designed to contain the ion sources, collector plates and water-cooled liners and have provision for diffusion pump connections and opening and closing for removal and reinstallation of these components.
(d) Magnet pole pieces
Especially designed or prepared magnet pole pieces having a diameter greater than 2 m and used to maintain a constant magnetic field within an electromagnetic isotope separator and to transfer the magnetic field between adjoining separators.
5.9.2. High voltage power supplies
Especially designed or prepared high-voltage power supplies for ion sources, having both of the following characteristics:
1. Capable of continuous operation, output voltage of 20,000 V or greater, output current of 1 A or greater; and
2. Voltage regulation of better than 0.01% over a time period of 8 h.
5.9.3. Magnet power supplies
Especially designed or prepared high-power, direct current magnet power supplies having both of the following characteristics:
1. Capable of continuously producing a current output of 500 A or greater at a voltage of 100 V or greater; and
2. Current or voltage regulation better than 0.01% over a period of 8 h.
In the electromagnetic process, uranium metal ions produced by ionisation of a salt feed material (typically uranium tetrachloride (UCl₄)) are accelerated and passed through a magnetic field that has the effect of causing the ions of different isotopes to follow different paths. The major components of an electromagnetic isotope separator include: a magnetic field for ion-beam diversion/separation of the isotopes, an ion source with its acceleration system, and a collection system for the separated ions. Auxiliary systems for the process include the magnet power supply system, the ion source highvoltage power supply system, the vacuum system, and extensive chemical handling systems for recovery of product and cleaning/recycling of components.
5.9.1. Electromagnetic isotope separators
Electromagnetic isotope separators especially designed or prepared for the separation of uranium isotopes, and equipment and components therefor, including:
(a) Ion sources
Especially designed or prepared single or multiple uranium ion sources consisting of a vapour source, ioniser, and beam accelerator, constructed of suitable materials such as graphite, stainless steel, or copper, and capable of providing a total ion beam current of 50 mA or greater.
(b) Ion collectors
Collector plates consisting of two or more slits and pockets especially designed or prepared for collection of enriched and depleted uranium ion beams and constructed of suitable materials such as graphite or stainless steel.
(c) Vacuum housings
Especially designed or prepared vacuum housings for uranium electromagnetic separators, constructed of suitable non-magnetic materials such as stainless steel and designed for operation at pressures of 0.1 Pa or lower.
EXPLANATORY NOTE
The housings are specially designed to contain the ion sources, collector plates and water-cooled liners and have provision for diffusion pump connections and opening and closing for removal and reinstallation of these components.
(d) Magnet pole pieces
Especially designed or prepared magnet pole pieces having a diameter greater than 2 m and used to maintain a constant magnetic field within an electromagnetic isotope separator and to transfer the magnetic field between adjoining separators.
5.9.2. High voltage power supplies
Especially designed or prepared high-voltage power supplies for ion sources, having both of the following characteristics:
1. Capable of continuous operation, output voltage of 20,000 V or greater, output current of 1 A or greater; and
2. Voltage regulation of better than 0.01% over a time period of 8 h.
5.9.3. Magnet power supplies
Especially designed or prepared high-power, direct current magnet power supplies having both of the following characteristics:
1. Capable of continuously producing a current output of 500 A or greater at a voltage of 100 V or greater; and
2. Current or voltage regulation better than 0.01% over a period of 8 h.