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Idaho State will host a microreactor cooled by sealed heat pipes at 900 degrees Celsius
NuCube's Advanced Research and Test Reactor takes out the mechanical coolant pumps, so its safety case now rests on data that NuCube and Canadian Nuclear Laboratories are still gathering on how sealed pipes behave above 900 degrees.
The Product Desk · Product desk
What happened
- Idaho State University is preparing to commission the first university-hosted advanced microreactor in the United States, the Advanced Research and Test Reactor, developed with NuCube Energy of Idaho Falls.
- The design drops the mechanical pumps that most reactors use to circulate coolant and instead uses heat pipes to carry thermal energy passively from the fuel core to the power-conversion system.
- Its architecture is built to operate above 1,652F (900C), which lets it supply both zero-carbon electricity and the high-temperature heat that heavy industrial processes need.
- The reactor will sit at ISU's Business and Research Park after the Department of Energy selected the university under its Nuclear Reactor Innovation Center Launch Pad USA program.
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Why it matters
- capability Because the unit is assembled in a factory before delivery, the campus becomes a place to evaluate the product as it would ship.
- decision Industrial users who need high-temperature process heat get physical access to a running unit before they have to commit to an order.
- precedent Hundreds of students trained on this design, per Idaho National Laboratory's deputy director, gives the operator pipeline a head start on hardware that has no commercial fleet yet.
Sam Jeffries tests NuCube components as the company's lab manager and test engineer. He is also an Idaho State graduate student with a decade of engineering experience, working through the degree while the hardware gets ready for the site [9]. Idaho National Laboratory deputy director Todd Combs said generations of students earned operator licenses on the university's 1965 reactor, and that hundreds more will train directly on the new microreactor to meet rising laboratory workforce needs [13].
Taking the pumps out changes what a reviewer has to examine. The passive path removes the pump from the list of things that have to keep running [3]. It also leaves the design without a long service record at 900 degrees. NuCube's program with Canadian Nuclear Laboratories is meant to supply one: experimental data plus computational models that predict how the heat pipes behave above 900C [6]. NuCube says those findings will expand its validation database and help clear safety reviews for future commercial licensing [7].
The unit is factory-built and modular, assembled before delivery [8]. Cristian Rabiti, NuCube's chief executive, described the venture as an effort to change how reactors are manufactured and deployed [14]. Fewer moving parts is a manufacturing claim on day one, and it becomes a licensing claim only once the 900-degree data behind the pipes is in hand.
The host is unusual for reasons that have nothing to do with the cooling design. Idaho State has run its own research reactor on campus since 1965, roughly 60 years of on-campus operation [18], and it is one of only 24 US universities with such a facility [10]. It also offers the only undergraduate nuclear engineering degree in Idaho [11]. Governor Brad Little told Wednesday's gathering at the future construction site that Idaho is focused on building components, technology and skilled workers for a wider nuclear renaissance [15][12].
Weigh a fewer-moving-parts pitch on whether removing the component removed the failure mode, or moved it into a material property at a temperature with no service history. Then on whether the data that closes that gap already exists outside the vendor, or the vendor is generating it now. Neither answer disqualifies this design, but either way the test program sets the schedule, not the factory. Wednesday's launch came with no power rating, no cost and no date for first operation [17].
What to watch
- Whether NuCube and Canadian Nuclear Laboratories publish heat-pipe data above 900C, and whether a regulator accepts it in a safety review.
- A published thermal or electrical rating and a commissioning date for the unit at ISU's Business and Research Park.
- Whether an industrial process-heat customer commits after evaluating the campus unit during live runs.