Don't do it near your base. Do it in the mining dimension and use flux networks. Put a flux point on an energy trash can with -9999 priority. That way only excess power gets dumped. That's the #1 reason why things go boom. Answer from iamnoobplzhelp on reddit.com
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Reddit
reddit.com › r/allthemods › i’m building a fission reactor for the first time - any tips?
r/allthemods on Reddit: I’m building a fission reactor for the first time - any tips?
January 29, 2026 -

Hi,

I recently started to play ATM10 and want to build a fission reactor. I have already automated fissile fuel (but much too slow and little)

Do you have any tips for the reactor? I’m a little afraid to blow everything up.

There are countless different videos on YouTube and I can’t decide which on is good.

I also don’t really want to put all the waste in waste barrel but reuse.

I am happy about every tip and every good video you have!

Thank you!

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SiriusMC Wiki
wiki.siriusmc.net › books › modpack-guides-and-tutorials › page › mekanism-fission-reactor-atm10
Mekanism Fission Reactor | ATM10
3 weeks ago - 5×5×5 reactor · 4–6 fuel assemblies · Burn rate ~1.0 mB/t · Connected industrial turbine · Infinite water source · Enter section select mode · Previous · SiriusMC's ATM Star Guide | ATM10 · Next · Mystical Agriculture - Magical Soil | ATM10 ·
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Reddit
reddit.com › r/allthemods › atm10 - mekanism fission reactor / turbine issues
r/allthemods on Reddit: ATM10 - Mekanism Fission reactor / turbine issues
December 4, 2024 -

Much like this guy, I have a fission reactor set up that's using 20mb/t of fuel, and a huge turbine, but the turbine is only producing ~140kFe/t.

All the resources on the FTB wiki, mekanism wiki, and various other sources like youtube videos say this should be producing ~1.3MFe/t.

Pics:
Reactor -
https://i.imgur.com/aehcWf9.png
https://i.imgur.com/K9QlVFS.png
Turbine -
https://i.imgur.com/4FXDvJn.png
https://i.imgur.com/zb31xZI.png

I was wondering if it was a throughput issue. The "Ultimate Pressurized Tube" says it has a capacity of over 1,000,00mb/t but it only reads 99,979mb/t of steam through the pipe. But adding another port+valve+pipe only halves the throughput number for each pipe, so it would seem that it's just not creating much steam. The temp also seems really low.

Is this a bug? Am I doing something wrong? I remember in ATM9 a reactor of this size producing vastly more power than this, and as I said, this "should" be producing 1.2~1.3MFE/t, rather than the (fairly mediocre) 140kFE/t that it is.

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YouTube
youtube.com › watch
How To Make And Fuel A Max Size Mekanism Fission Reactor | ATM 10 | Ep 11 - YouTube
I hope you treasure the wisdom bestowed unto you -------Links 🚨Twitch: https://www.twitch.tv/foogly-------
Published   December 16, 2024
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Mekanism Wiki
wiki.aidancbrady.com › wiki › Fission_Reactor
Fission Reactor - Official Mekanism Wiki
A Fission Reactor is a multiblock structure that generates massive amounts of heat but does not produce power on its own. How much heat is generated depends on the rate at which it burns Fissile Fuel. The only way to transform this heat into power is to inject "fresh" coolant into the reactor ...
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YouTube
youtube.com › watch
Ultimate Mekanism FISSION REACTOR Guide | 18x18 Max & Self-Sustaining (ATM10) - YouTube
Hey everyone, in this video I will show you how to set up the MAXIMUM EFFICIENCY Fission Reactor from Mekanism in All The Mods 10. This will be a complete gu...
Published   September 12, 2025
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YouTube
youtube.com › watch
Ultimate Mekanism FUSION REACTOR Guide | SELF-SUSTAINING (ATM10) - YouTube
Hey everyone, in this video I will be showing you how ro build a self sustaining fission reactor in all the mods 10!! MATERIALS LISTED BELOW !0:00 intro1:04 ...
Published   September 29, 2025
Find elsewhere
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Reddit
reddit.com › r/allthemods › [atm-10] mekanism fission reactor keeps exploding
r/allthemods on Reddit: [ATM-10] Mekanism fission reactor keeps exploding
April 1, 2025 -

As the title says, I have a fission reactor to get plutonium and polonium and it seems like randomly when I log into my world the reactor has exploded, I have a crap tonne of coolant and the waste is going into my turbine set to dump the excess steam so I'm just generally confused as to how it keeps blowing up. plus I set up the "failsafe" that's in the quest line and it has never once prevented it from blowing up so I'm just generally confused and don't want this to keep happening

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Mekanism Wiki
wiki.aidancbrady.com › wiki › Fission_Reactor_Tutorial
Fission Reactor Tutorial - Official Mekanism Wiki
When sizing the turbine, just keep this in mind and use either 20,000*reactor_burn_rate or reactor_heating_rate/10. The size of the boiler will depend on the desired tank sizes and boil rate. Boilers have four tanks: heated coolant, water, steam and (cold) coolant. Compared to a Mekanism v9 boiler, in v10 the water tank doubles as a heated coolant tank and the steam tank doubles as a coolant tank.
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YouTube
youtube.com › watch
All The Mods 10 EP40 Mekanism Fission Reactor Setup: Steam Power & Waste Processing - YouTube
Welcome to my All The Mods 10 (ATM10) adventure! This modpack combines classic modded Minecraft fun with exciting new mods, running on the latest 1.21 versio...
Published   January 18, 2025
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YouTube
youtube.com › watch
Building a Mekanism Fission Reactor - AllTheMods 10 Ep.47 - YouTube
Welcome to Episode 47 of our AllTheMods 10 series! In this episode, we’re diving deep into nuclear energy by constructing a Mekanism Fission Reactor. This po...
Published   September 12, 2024
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GitHub
github.com › AllTheMods › ATM-10 › issues › 794
[Quests issues]: Fusion reactor does not produce 200 MRF/t · Issue #794 · AllTheMods/ATM-10
October 16, 2024 - Modpack Version 1.1 Describe the issue I followed the quest line and made a fusion reactor with direct D-T Fuel injection. The quest says it can generate up to 200 MRF/t with 500 mb/t if D-T Fuel b...
Author   AllTheMods
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Reddit
reddit.com › r/allthemods › fission reactor at maximum size
r/allthemods on Reddit: Fission reactor at maximum size
July 26, 2025 -

Something about fission reactors

One reactor, one boiler, three turbines, using the entangled mod to bypass the transfer rate, everything would be perfect, if only it didn't require over 1 million buckets of sodium and 2,000 mB/t of fissile fuel.

The real problem is always generating fuel, but setting the reactor at 750 mB/t already gives me enough polonium to fuel my SPS. In fact, I already have so much atimaterium that I'll leave it at about 200 mB/t for a while. There simply isn't enough fissile fuel production to keep up, not to mention having to generate so much sulfur, fluorite, and uranium.