We talked about the military’s idea of mobile nuclear reactors and ridiculed it as one of the dumbest ideas ever (see, “Mobile Nuclear Reactors – The Dumbest Idea Ever”) but now, it seems, the military is going ahead with it.
The Pentagon today announced that Idaho National Labs will build and initially operate a type of mobile “nuclear microreactor” … [1]
… designed to deliver one to five megawatts of electrical power for a minimum of three years … [1]
The reactor fuel will be high-assay low-enriched uranium (HALEU) fabricated into tristructural isotropic (TRISO) reactor fuel[2] … whatever that means. I’m not a nuclear fuel expert. See ref.[4] for a discussion of the vulnerabilities of the fuel.
The Department of Defense (DOD) has picked BWX Technologies’ (BWXT’s) microreactor design for its “Project Pele” full-scale transportable prototype.
Lynchburg, Virginia-based BWXT will now manufacture and deliver the prototype microreactor to Idaho National Laboratory (INL) for testing by 2024. “The prototype will be built under a cost-type contract valued at approximately $300 million … [2]
Three hundred million dollars? For one? You can buy a lot of conventional energy for that amount!
Why are we doing this?
“A safe, small, transportable nuclear reactor would address this growing [energy] demand with a resilient, carbon-free energy source that would not add to the DoD’s fuel needs … [1]
Let’s be thorough and note that this will add to DoD’s fuel needs. The graphics shown in the photos below note that the transportation fuel requirements are substantial and then the operating site will require heavy earth moving and construction equipment to set up. That heavy equipment will require its own transportation and operating fuel.
The descriptions depict this as a zero-impact energy source. What about the disposal impact? What will happen when we have to dispose of dozens of these units? Ominously, disposal does not appear to have been examined as part of the project. Disposal planning is offered only as a possible future add-on study. As we know, possible future add-ons almost never happen.
INL could also potentially conduct mobile microreactor and spent nuclear fuel post-irradiation examination and disposition.[2][emphasis added]
Radioactive material disposal is already an unsolvable and growing problem and we’re looking to add to the magnitude of the problem for a minor (1-5 megawatts) gain in convenience? Is that really a positive in the overall picture?
Where will we use this reactor?
.. supporting mission-critical operations in remote and austere environments.[1]
Note the size of the transport vehicle in the photos above. How are we going to get that vehicle to ‘remote and austere environments’ and, once there, how will that vehicle traverse areas that, because they are ‘remote and austere’, likely have no roads suitable for such a vehicle?
Its transportable design “consists of multiple modules that contain the microreactor’s components in 20-foot long, ISO-compliant CONEX shipping containers.[2]
The reactor assembly is spec’ed to weigh up to 40 tons.[4] That’s not light and not easily transported across ‘remote and austere’ terrain.
What about safety, both operational and combat damage related? According to Jeff Waksman, program manager,
… an inherently safe by design mobile microreactor can be constructed … [1]
Inherently safe nuclear equipment? Whew, that’s a load off my mind! Unfortunately, Mr. Waksman then immediately contradicts himself,
It’s not that they’re no risk, but it is just a different era.[1]
Uh … so there is risk but the risk is in a different era????? Huh? Is risk in a different era somehow better?
We have the ability to build reactors that, even in worst case scenarios, have very minor radiological imprints.[1]
So, there is a radiation risk but it’s minor? I’m guessing the exposed soldiers and surrounding civilian people and villages won’t consider it minor.
The Drive website notes,
There are concerns, of course, associated with deploying mobile nuclear reactors to bases or the battlefield. Meltdowns, waste products, and other malfunctions are always a concern with nuclear energy technologies, and if a reactor in a contested area is destroyed by adversary forces, for example, the risk of environmental contamination is high. That, in turn, could create a political disaster for the DOD and United States. Deploying any nuclear systems abroad also incurs the risk of proliferation if those technologies should fall into the wrong hands due to a forward-operating base or convoy being overrun by hostile forces.[3]
That seems like a lot of risk for a minor (1-5 megawatts) gain in energy.
We’ve seen that the nuclear power plant in Ukraine has come under fire from Russia. What happens when these mobile reactors are shelled and blown up?
Just out of curiosity, what happens when enemies and terrorists capture these things? We’ve had drones, ships, and aircraft captured by various enemy countries. Why would we think a mobile nuclear reactor would not be seized? Again, I’m not a nuclear expert but I suspect that a clever and resourceful enemy could come up with many ways to use these reactors to our detriment. Do we really want to give an enemy or a terrorist the ability to cause major panic by threatening radioactive catastrophe? Look at our over-the-top reaction to Monkeypox. It doesn’t require a real threat to generate a real panic.
I previously called this one of the dumbest ideas ever and I’m not seeing anything to change my mind.
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[1]Breaking Defense website, “Idaho National Labs to build Pentagon’s mobile ‘nuclear microreactor’”, Jaspreet Gill, 13-Apr-2022,
[2]https://www.powermag.com/dod-picks-bwxt-to-manufacture-project-pele-prototype-nuclear-microreactor/