Advanced Test Reactor

Advanced Test Reactor
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Name	Advanced Test Reactor
Location	Idaho National Laboratory
Status	Operational
Construction began	1965
Commission date	1967
Owner	United States Department of Energy
Operator	Battelle Energy Alliance
Reactor type	Pressurized water reactor
Power thermal	250 MW

Advanced Test Reactor. The Advanced Test Reactor is a premier materials and fuels testing facility located at the Idaho National Laboratory in the United States. Operated for the United States Department of Energy by the Battelle Energy Alliance, this unique pressurized water reactor began operations in 1967. It is renowned for its exceptionally high neutron flux, which enables accelerated testing of nuclear materials under extreme conditions.

Overview

The primary mission of this facility is to support the research and development of next-generation nuclear technologies for both civilian and national security applications. It plays a critical role in the United States Navy's nuclear propulsion program, testing materials for naval reactors like those used on USS Nimitz-class aircraft carriers and Virginia-class submarines. The reactor also supports fundamental research for agencies including the National Aeronautics and Space Administration and the Nuclear Regulatory Commission. Its unique design allows for simultaneous, independent experiments, making it a vital resource for the global nuclear community.

Design and capabilities

The reactor's core is characterized by a distinctive serpentine fuel configuration, which creates nine high-intensity neutron flux traps. This design, developed by engineers at the Idaho National Laboratory, produces one of the highest steady-state neutron fluxes in the world. The core is surrounded by a large beryllium reflector that helps to concentrate neutrons into the test locations. Key experimental capabilities include in-core irradiation loops that can simulate various reactor coolant conditions, such as those found in boiling water reactors or supercritical water reactors. The facility also features numerous peripheral positions and a dedicated hot cell for post-irradiation examination conducted by experts from the Materials and Fuels Complex.

Research and testing programs

The experimental programs are diverse, focusing on fuel cladding performance, structural material degradation, and advanced fuel forms for next-generation reactors. Significant work supports the development of accident-tolerant fuels intended for use in existing light-water reactor fleets. The reactor has been instrumental in testing materials for space exploration, including components for Radioisotope thermoelectric generators used in deep-space missions like those to Mars and Saturn. International collaborations, often coordinated through the International Atomic Energy Agency, are common, with research supporting reactor designs from organizations like Framatome and the Japan Atomic Energy Agency.

Operational history

Since achieving criticality in 1967, the reactor has operated continuously, supporting every major U.S. nuclear research initiative. It underwent a significant core internals change in the 1970s to enhance its testing capacity. Throughout the Cold War, it was pivotal for naval nuclear propulsion research, contributing directly to the longevity and safety of the Ohio-class submarine fleet. In the 21st century, its mission expanded to include testing for the Next Generation Nuclear Plant project and the Versatile Test Reactor program. It has also provided essential data for life-extension programs of existing commercial power plants operated by entities like Exelon and Southern Company.

Safety and containment features

The reactor incorporates multiple, redundant safety systems consistent with the stringent standards of the Department of Energy. It is housed within a robust containment building designed to withstand extreme natural events. Primary safety systems include diverse shutdown mechanisms and emergency core cooling systems. Operational safety is managed through a rigorous protocol overseen by the DOE Idaho Operations Office, with oversight from federal agencies. The design emphasizes passive safety features where possible, and the facility maintains an exemplary operational record, contributing valuable data to organizations like the Institute of Nuclear Power Operations.

Category:Nuclear research reactors Category:Idaho National Laboratory Category:Nuclear technology in the United States