- List
- NSG – Trigger List (Part 1) – INFCIRC/254/Rev.15/Part 1 (21 April 2026)
Complete heavy water upgrade systems, or columns with diameters of 0.1 m or greater, especially designed or prepared for the upgrade of heavy water to reactor-grade deuterium concentration.
EXPLANATORY NOTE
Heavy water upgrade systems typically support the operation of a heavy water moderated nuclear reactor or are part of a GS heavy water production plant (in which case they are commonly termed ‘finishing units’). Upgraders separate heavy water from light water. Such systems usually employ water distillation, but may also be based on the CECE process. In heavy water moderated nuclear reactors, upgraders maintain the heavy water concentration in the reactor core.
EXPLANATORY NOTE
Heavy water upgrade systems typically support the operation of a heavy water moderated nuclear reactor or are part of a GS heavy water production plant (in which case they are commonly termed ‘finishing units’). Upgraders separate heavy water from light water. Such systems usually employ water distillation, but may also be based on the CECE process. In heavy water moderated nuclear reactors, upgraders maintain the heavy water concentration in the reactor core.