About Hazardous Reactors
From Steam Workshop-IMPORTANT- This Mod requires server-side Lua to function! Instructions on how to install server-side Lua can be found here: [url=https://steamcommunity.com/workshop/filedetails/?id=2559634234] Lua…
-IMPORTANT-
This Mod requires server-side Lua to function!
Instructions on how to install server-side Lua can be found here: Lua For Barotrauma
[hr][/hr] Hazardous Reactors is an overhaul mod that aims to make the life of an engineer much more interesting. It reworks the reactor and its associated items, and adds a series of new dangers and benefits to nuclear power on board a submarine.
Some features include:
- Dynamic Reactor Damage
- Dynamic Ionizing Radiation
- Supercritical Warheads
- New Afflictions
- Extremely Hot Fuel Rods
- Specialized Engineering Equipment
- Radioisotope Thermoelectric Generators
[hr][/hr] In-depth guides to Hazardous Reactors can be found here: (English) (French)
[hr][/hr]
-THE BASICS-
Ionizing Radiation
An invisible and potentially deadly form of energy that continuously emits from damaged reactors and uncontained radioactive material. The only way to reliably and accurately detect it is with a Geiger Counter. Engineers should keep one in their hotbar at all times. The more radioactive an object, the more dangerous it is.
The Reactor
When damaged, reactors will leak radiation at an increasing rate. Regular repairs are needed to keep the reactor in operating condition, and keep the crew safe from radiation exposure.
Do not attempt to repair the reactor with insufficient skills while it is online! Failing the skill check will result in a steam explosion, sending you flying and damaging the reactor further. Power the reactor fully offline prior to repairing it. Once your skills are high enough, or you have bought upgrades to the reactor, you can safely repair it while it is operating.
Fuel Rods
Fuel Rods are no longer inert after they have been "activated," (i.e. their fission process has started.) Once rods are active, they become extremely dangerous and should not be removed from containment.
Spent rods inside of a reactor should be transferred directly into containment vessels. Any direct handling of active rods should be done with tongs to prevent serious burns.
Different fuel rods have different hazards when uncontained.
- Uranium/Thorium Fuel Rod- Emits high amounts of radiation. Will start fires if left uncontained for too long.
- Fulgurium Fuel Rod- Emits EM pulses that will damage any electronics nearby.
- Volatile Fulgurium Fuel Rod - Emits large EM pulses and will melt through hulls if left uncontained.
- Incendium Fuel Rod - Emits extreme amounts of heat and will quickly start fires.
Specialized Tools
Hazardous Reactors adds a number of tools for the Engineer to use, making their lives easier and allowing for greater effectiveness on, (and off) the submarine.
- Geiger Counter- A small handheld device that allows the accurate detection of radiation. Engineers and other personnel likely to encounter radiation should have one in their hotbar at all times. The more frequent the clicking, the more radiation is being detected.
- Radiation Shielded Backpack- A shielded backpack with an inbuilt Geiger Counter, able to safely transport radioactive materials and other equipment an engineer needs to carry.
- Shielded Crate / Shielded Cylinder- Devices used to safely store active fuel rods and radioactive materials.
- Fuel Rod Handling Tongs- A set of heavy tongs, used to keep fuel rods at arms length when transferring them to and from containment. Doubles as a melee weapon, and is effected by any talents that effect crowbar damage.
- Radioisotope Thermoelectric Generator- A type of nuclear power cell that converts heat directly to electricity. Will run on just about anything radioactive, and requires a special manual to craft and place.
Medical
At some point the engineer is going to crawl into medbay covered in burns and vomiting blood. You should know some things before you try to fix them.
-There is a possibility that the engineer in question is contaminated, possibly from exposure to dust while deconstructing radioactive materials. Ensure they are not a danger to you before treating them.
[hr][/hr]
FAQ
Q: How do I safely repair the reactor without it blowing up in my face?
A: Power off the reactor, and vent pressure until the power output is zero. Once your skills are high enough, you can repair the reactor while it is running.
Q: Is Hazardous Reactors bot friendly?
A: Yes and No. Bots will happily kill themselves if left to repair or refuel the reactor on their own. If you set the bots to ignore the reactor and try to keep them out of the reactor room, there should be no issues.
Q: How can I craft a Crisis Warhead?
A: You'll need to create a supercritical rod by performing a controlled reactor meltdown. Beacon stations are an excellent way to do this.
Q: Is the mod mid-campaign friendly?
A: No, any active fuel rods will be ejected from where they are stored and cause massive fires on board the submarine.
[hr][/hr] Looking for compatibility patches? They can be found here. [hr][/hr]
-Special Thanks-
Barotrauma Modding Discord and all the people who gave me small bits of help here & there
Highlights
From source dataFootprint
A 13 MB download, rated a light load on a server.
Last update
Its author last shipped an update 4 mo ago.
Hazardous Reactors on Nxeon
From our catalogue- One-click install
- Not available. One-click install isn't available for this game's mods yet. Download it and upload it to your server in Files.
- Server load
- light
- Smallest plan we suggest
- Barotrauma — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
- Latest build
- 2026-06-19, released 2026-06-19, 13 MB
Game versions by loader
| Loader | Game versions | Newest |
|---|---|---|
| Workshop |
From 1 recorded build of Hazardous Reactors.
Dependencies
- Required: LuaCsForBarotrauma
Declared by the newest build that lists any. Required ones are installed with it on one-click installs.
Run Hazardous Reactors on a Barotrauma server
Deploy a server above, then upload the file in Files.
What kind of mod it is
From the catalogTechnology & automation
Machines, power, logistics and automation.
Compatibility
- Game
- Barotrauma
- File size
- 13 MB
Verified at the source
- ✓Steam WorkshopOfficial listing, checked 2026-10-10Open ↗
- ✓AuthorFoxtrot39, as published on Steam Workshop
- ✓LicenseNot published by the sourceFree
