Joel McDuffee
mcduffee.bsky.social
Joel McDuffee
@mcduffee.bsky.social
Nuclear engineer by day. Current and former hobbies include hiking, beekeeping, woodworking, 3D printing, reading histories, programming, feeding birds, and fencing (swords not posts).
My wife is our designated health insurance communicator. It makes the hair stand up on the back of my neck when she really gets going. There is no passive in her aggressive.
November 3, 2025 at 12:26 AM
Walt Whitman wrote about baseball in 1846 in the Brooklyn Eagle, so it’s at least older than that.
May 24, 2025 at 12:10 AM
Very sorry to hear what y’all are going through. Far less serious but related example: for many migraine sufferers, the first sign of a migraine is the inability to recognize you have one. You know you’re hurting and you know you get migraines, but you just can’t put it together.
March 8, 2025 at 1:32 AM
Sorry— late to the game but you might look into nuclear materials research, isotope production, or neutron scattering research. Both Oak Ridge National Laboratory and Idaho National Laboratory have research reactors with large programs. Most any National lab will have nuclear research programs.
February 15, 2025 at 8:10 PM
Congratulations!
January 29, 2025 at 4:22 PM
Har!
December 25, 2024 at 10:14 PM
Thanks for asking! HFIR is an entirely peaceful use facility. Our 3 major missions are neutron scattering for basic research, isotope production mostly for medical uses, and fuels and materials research. One of the major things we will be doing with this position is to convert our fuel to LEU.
December 24, 2024 at 2:49 AM
If you're into nuclear thermal-hydraulics, you won't find a more interesting system to work on. It's a fascinating machine. If you're interested, feel free to reach out. 6/6

Here's more about HFIR: www.energy.gov/ne/articles/...
7 Fast Facts About the High Flux Isotope Reactor at Oak Ridge National Laboratory
7 fast facts on the High Flux Isotope Reactor—one of the nation's top facilities in producing medical- and industry-grade isotopes.
www.energy.gov
December 22, 2024 at 12:26 AM
That's an entire swimming pool volume that we push into the vessel every minute. The flow rate is about 50 feet per second. With a 2' core length, the transit time for the coolant is just 0.04 seconds, and in that short time the temperature goes up 35ºF.
5/6
December 22, 2024 at 12:26 AM
If we just had straight plates, the coolant channel would be larger near the outer radius and all the coolant flow would go there. The curved plates also provide hydraulic stability in the turbulent flow. How much flow? 16,000 gallons per minute. No, I didn't forget a decimal point. 4/6
December 22, 2024 at 12:26 AM
How do we keep it cool with all that power? Using what I think is one of the coolest features of HFIR and one that is rare in the nuclear reactor world -- involute fuel plates! There are hundreds of individual fuel plates, and each is curved so that the coolant gap is constant everywhere.
3/6
December 22, 2024 at 12:26 AM
HFIR is a special for a lot of reasons, but the main one is a ridiculously high power density. We generate 85 MW in a volume equal to maybe a half of a 55 gal drum. High power density means high neutron density, which is how we make critical medical isotopes that can't be made anywhere else.
2/6
December 22, 2024 at 12:26 AM
*lying, not laying. I always get the wrong.
November 28, 2024 at 7:28 PM
Hi Manuel! I’m a nuclear engineer and my research is made not in nuclear materials and thermal hydraulics

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November 20, 2024 at 7:41 PM
My ANS student conference was at TAMU. It was a fun trip and I had a great time. I’m thankful there are no pictures and that smart phones and social media hadn’t been invented yet.
November 19, 2024 at 1:32 AM