TRISO-X Completes Vertical Construction Of TX-1 Fuel Fabrication Facility
The title of this post, is the same as that of this news item from X-energy.
These two bullet-points act as sub-headings.
Completion of vertical construction marks major milestone for first-in-the-nation commercial scale advanced nuclear fuel fabrication facility
Project advances into interior buildout, fuel fabrication equipment installation and construction of supporting facilities
These two paragraphs add more detail.
TRISO-X, LLC (“TRISO-X” or the “Company”), a wholly-owned subsidiary of X-Energy, Inc. (Nasdaq: XE) (“X-energy”), today announced the completion of vertical construction at TX-1, its first-in-the-nation advanced nuclear fuel fabrication facility in Oak Ridge, Tennessee. The milestone completes the primary building structure of the 214,000-square-foot facility and enables the project to advance fully into its next phase of construction, including interior buildout, installation of fuel fabrication equipment and continued construction of supporting facilities.
“Completing vertical construction is a major milestone for TX-1 and another tangible demonstration of the progress our team is making in Oak Ridge,” said Joel Duling, President of TRISO-X. “We are moving from constructing the core and shell of the facility to building out the interior utilities, installing manufacturing equipment, and constructing key support capabilities. Every milestone brings us closer to establishing a new domestic source of advanced nuclear fuel and supporting the deployment of the next generation of American nuclear reactors.”
Note.
- Oak Ridge is one of the United States premier nuclear facilities.
- It would be like building a similar facility for specialist nuclear reactor fuel at Harwell in the UK.
This is without doubt a very professional start to the X-energy programme.
I also feel that the fourth paragraph has important information.
Once operational, TX-1 is expected to produce approximately 700,000 TRISO-X fuel pebbles annually, equivalent to 5 metric tons of uranium (“MTU”), with capacity to provide fuel for up to 11 Xe-100 reactors. The U.S. Nuclear Regulatory Commission (“NRC”) granted TRISO-X a 40-year Special Nuclear Material License for the facility earlier this year, the first-ever NRC Category 2 fuel fabrication license issued for the processing of high-assay low-enriched uranium. TX-1 is expected to be the first new commercial-scale advanced U.S. nuclear fuel fabrication facility built in more than 50 years.
Note.
- TX-1 will be able to support eleven Xe-100 reactors.
- Four Xe-100 reactors will be built initially at Dow’s Seadrift site.
- In Hartlepool Nuclear Reactor Moves To UK Regulatory Assessment, I said that Hartlepool will eventually be a 12-pack site.
I can envisage a fuel strategy based on TX-1, which is something like this.
TX-1 will provide the TRISO fuel for the four reactors at Dow’s Seadrift site.
TX-1 will provide the TRISO fuel for the initial reactor or reactors at a new site like Hartlepool, or for other licensees like Amazon or North Western.
TX-1 will be cloned as necessary to create TX-2, TX-3, TX-4 etc. as more Xe-100 reactors are built.
I am sure, that there is relevant expertise to make TRISO-X fuel pebbles safely in Japan, Korea and the UK of the known partners of X-energy.
The Wikipedia entry for the Dragon reactor finishes with these three paragraphs.
The choice of helium coolant was made after a long debate within the UKAEA between proponents of helium and carbon dioxide, with helium ultimately selected. Groundbreaking occurred in 1960. It operated from 1965 to 1976, and is generally considered extremely successful.
Dragon’s construction was followed by similar work in the US, leading ultimately to the much larger Fort Saint Vrain Nuclear Power Plant. This suffered from a number of problems due to corrosion and the customer soured on the design. Contracts for similar models in the US that were being signed were cancelled, and although Dragon suffered none of these issues, no orders were forthcoming in Europe either. By this time the market had largely standardized on the pressurized water reactor (PWR) for the large buildout that occurred during the 1970s and 80s, and the decision was made to shut down Dragon.
As of 2023, Dragon is being decommissioned.
Note.
- It appears only two reactors using TRISO fuel have been constructed.
- The 20 MW Dragon reactor was extremely successful.
- The 330 MW Fort Saint Vrain reactor had corrosion problems.
- Both reactors used helium gas as a coolant.
- The Wikipedia entry for the Fort Saint Vrain reactor details the corrosion problems.
- According to Google AI fuel for Fort Saint Vrain was fabricated at the General Atomic Fuel Fabrication Facility in San Diego, California.
- According to Google AI fuel for the Dragon reactor was fabricated on-site at Winfrith.
After writing these seven points, I have concluded that TRISO-fueled helium-cooled nuclear reactor designs better suited to small reactors?
What does Google AI think?
I asked Google AI “Are TRISO-fueled helium-cooled nuclear reactor designs better suited to small reactors?” and received this reply.
TRISO-fueled, helium-cooled reactor designs are exceptionally well-suited for small and micro-modular reactor applications because their physical properties scale down efficiently to provide inherent safety and high-temperature operation.
Why They Suit Small Reactors
Inherent Safety (Walk-Away Safe): Each TRISO fuel particle acts as its own tiny containment system, capable of withstanding extreme temperatures (well over 1,600°C) without melting or releasing radioactive fission products. In a small reactor design, the high surface-area-to-volume ratio allows residual decay heat to dissipate passively through the reactor vessel walls, meaning the reactor cannot suffer a catastrophic meltdown even if active cooling completely fails.
Simplified Helium Cooling: Helium is chemically inert and does not absorb neutrons or become radioactive. In smaller reactor configurations, helium’s single-phase gas state eliminates the high-pressure water loops and massive containment structures required by traditional large light-water reactors.
High-Temperature Process Heat: Because helium can operate at very high temperatures without boiling off, small TRISO-gas systems can deliver high-grade industrial heat (useful for chemical plants or hydrogen production) alongside electricity.
Compact Footprint: Small modular reactor (SMR) and microreactor developers (such as X-energy and Ultra Safe Nuclear Corporation) leverage these traits to design factory-fabricated units that can be transported and sited near urban or off-grid industrial locations.
Key Challenges
Power Density and Size: Helium has a lower volumetric heat capacity than water, meaning gas-cooled cores can be physically bulkier per megawatt than water-cooled equivalents, placing a premium on optimizing core geometry for micro-scales.
Supply Chain and Cost: High-Assay Low-Enriched Uranium (HALEU) and specialized TRISO manufacturing face immature supply chains and higher first-of-a-kind costs.
The more I read about X-energy’s technology, the more I like it.
Research And Development Agreement Signed For Hydrogen Combustion Trains In US
The title of this post, is the same as that of this article on H2-View.
This is the opening paragraph.
Hydrogen combustion engine-powered trains are set to be at the centre of a collaborative research and development agreement between Argonne and Oak Ridge National Laboratories and Wabtec in a bid to decarbonise US rail.
The US is certainly calling up the heavy brigade in Argonne National Laboratory, Oak Ridge National Laboratories and Wabtec.
This appears to be the main objective.
It is hoped the team will be able to design train engines that will deliver the same power, range, and cost-effectiveness as current diesel technology.
The article states that there are 25,000 diesel locomotives in the United States, but because of exports to large parts of the world, including the UK, this research could clean up a lot more than just the United States.
The omens are good, in that both Cummins and Rolls-Royce mtu, who are two of the world’s big diesel engine manufacturers have successfully launched hydrogen combustion engines.
