Apollo is building the most power-dense pressurized-water nuclear reactor. (YC P26)
Joined May 2026
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Photos and videos
Jun 4
⚡️☢️
Jun 4
When Jessica and I spoke at YC last night there was a bright flash out behind the building. We were a bit nervous because there's a nuclear reactor startup in the batch that has a bunch of hardware back there. But apparently it was just a muni cable shorting out.
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Apollo Atomics retweeted
Jun 1
Just made it to the YC office. Demo Day loading… ⚛️
@ycombinator @DrewWal43470101
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Apollo Atomics retweeted
Jun 1
the closer we get to demo day, the more strange objects get delivered to the YC parking lot
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Apollo Atomics retweeted
Jun 1
I turned up at the YC office this morning to find @ApolloAtomics installing the primary loop autoclave for their nuclear reactor 😬
It’s the new component that means their SMRs will be 80% smaller than traditional designs.
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Jun 1
🚀
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Apollo Atomics retweeted
May 27
Some founders don't follow the arc of progress; they bend it through sheer force of will.
Assil is one of them.
youtube.com/watch?v=vy8y_t1K…
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May 27
Building the modern nuclear company.☢️
May 27
.@ApolloAtomics builds the most compact nuclear reactors with the highest uptime and a deployment time of less than 24 months.
Apollo took the pressurized water reactor technology that already powers 80% of the world’s nuclear plants and flipped one part, the steam generator, to make the plant an order of magnitude smaller without compromising power.
Congrats on the launch, @AssilHalimi & Drew!
ycombinator.com/launches/QXj…
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