An aqueous homogeneous reactor (AHR) is a type of nuclear reactor built as a two-chamber vessel, with an interior reactor chamber surrounded by an outer cooling and moderating jacket chamber. Rather than using solid fuel rods, it dissolves soluble nuclear salts, usually uranium sulfate or uranium nitrate, directly in water. The dissolved fuel is mixed with heavy or light water, which partially moderates and cools the reactor, while the water in the outer jacket chamber provides further cooling and moderation. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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Classification
MaturityTRL 9: Actual System Proven in Operational Environment 1 Technology Type Invented Year Connections
Uses Source
Source Wikipedia: Aqueous homogeneous reactor
Sources
1. Aqueous homogeneous reactor - Wikipedia
Technology maturity, Wikipedia introduction extract fetched 2026-09-25Quote, Technology maturity, Wikipedia introduction extract fetched 2026-09-25
AHRs were widely used as research reactors as they are self-controlling, have very high neutron fluxes, and were easy to manage.
2. Wikipedia: Aqueous homogeneous reactor
History section
LOPO achieved criticality in May 1944, after one final addition of enriched uranium.
Uses Source: Uranium, Wikipedia article lead
reactor in which soluble nuclear salts (usually uranium sulfate or uranium nitrate) are dissolved in water. The fuel is mixed with heavy or light water
In Group: Research and Small Reactors, Lead
Aqueous homogeneous reactors (AHR) is a two-chamber reactor consisting of an interior reactor chamber and an outside cooling and moderating jacket chamber.
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