About the Game
Welcome to Nuclear Reactor Simulator, where you step into the shoes of a nuclear power plant operator tasked with managing one of the most complex and dangerous systems on Earth. With the help of your AI-powered Operational Assistant (AO), you’ll navigate the intricacies of reactor mechanics, balance energy production, and prevent catastrophic failures.

This isn’t just a game—it’s a deep, immersive simulation that challenges your strategic thinking, problem-solving skills, and ability to stay calm under pressure. Whether you’re a seasoned simulation enthusiast or a curious newcomer, Nuclear Reactor Simulator offers a thrilling and educational experience like no other.
Key Features
Realistic Nuclear Reactor Operation
Control Every Aspect: Manage over 200 parameters and 150 switches across multiple reactor modules, including the Control Room, Containment Building, Turbine Building, and Cooling Towers.
Dynamic Systems: Monitor and adjust reactor power, coolant flow, steam generation, and more to maintain optimal performance.
Emergency Scenarios: Respond to unexpected events like equipment failures, floods, and fires with quick decision-making and precise actions.

AI-Powered Assistance
Operational Assistant (AO): Your AI companion helps with ignition protocols, alarm systems, and crisis management. Upgrade its skills to unlock advanced functionalities.
Remote Control: Use your tablet to manage reactor tasks, control AO, and oversee operations from anywhere in the plant.
Complex and Rewarding Gameplay
Daily Objectives: Meet energy production goals to earn Prestige and Experience Points. Level up to unlock more challenging scenarios.
Resource Management: Balance fuel consumption, maintenance costs, and community demands to keep your plant running efficiently.
Prestige System: Spend Prestige Points on upgrades, fuel blocks, protective gear, and even radioactive waste cleanup.

Advanced Reactor Mechanics
Enhanced Core Design: Operate a state-of-the-art reactor with nine fuel blocks, 72 control rods, and advanced safety systems.
Chemical Module: Dive into the chemistry of reactor operation with boric acid dosing, ion exchange filtration, and pH management.
Thermal and Steam Balance: Master the delicate equilibrium between steam generation, coolant flow, and energy output to avoid system failures.
Immersive Atmosphere
Realistic Soundtrack: Feel the tension and excitement of managing a nuclear power plant with an atmospheric soundtrack.
Detailed Environments: Explore every corner of your plant, from the Control Room to the underground maintenance tunnels.

What Makes This Game Unique?
Nuclear Reactor Simulator stands out with its unparalleled depth and realism. Unlike other simulation games, it doesn’t hold your hand with step-by-step tutorials. Instead, it empowers you to learn through experimentation, research, and community collaboration.
No Hand-Holding: Consult the in-game manual, research real-world reactor operations, or join the community to master the game’s mechanics.
Constantly Evolving: Regular updates introduce new features, improve realism, and refine gameplay based on player feedback.
Educational Value: Learn the science behind nuclear energy while having fun.
Why You’ll Love This Game
Thrilling Challenges: Every decision matters. Will you prioritize power output or safety? Can you handle the pressure of an emergency?
Endless Replayability: With dynamic systems, evolving challenges, and a community-driven learning curve, no two playthroughs are the same.
A True Simulator: This isn’t just a game—it’s a realistic, hands-on experience that will test your skills and keep you coming back for more.

Join the Community
Become part of a growing community of players who share tips, strategies, and stories of their reactor operations. Whether you’re looking for advice or want to show off your achievements, there’s a place for you in the Nuclear Reactor Simulator community.
Ready to Take Control?
Step into the Control Room, fire up the reactor, and see if you have what it takes to power the world—or risk a meltdown. Nuclear Reactor Simulator is waiting for you.

Screenshots
24 images
Version Information
Steam Patch Notes
Official update history
The following improvements and fixes were implemented:
- Fixed an issue in the metrics app where data for the estimated demand and generated energy charts would sometimes not be displayed.
- Fixed an issue with charts that require dynamic scale adjustment.
- Fixed an issue that prevented the game from being saved when an autosave was pending to start.
- Fixed issues related to loan payments.
- Fixed a visual issue with the exterior lights in the truck arrival area.
- Added the "Condenser Retention Tank Low Volume" alarm.
- Added the "Resistance Bank Overheated" alarm.
- Added a slider to the metrics app to make it easier to navigate through past days.
- Modified the audit system so that there are no plant visits during the first 10 days.
- Improved the code that manages AO,doors, cameras, and the exterior environment.
- Improved English and Spanish localization.
Cooperative Mode: Fusion 2.0 Implementation \
- Modified the connected user counter in the lobby to reduce data consumption.
- Added error details to the room connection process to help support.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed an issue with the door detection system that did not work correctly if the player or AO entered the detection zone while the door was closing.
- Added a missing collider to the upper access area of the reactor fuel storage area.
- Added a detector for previous crashes to assist support.
- Improved AO’s ability to find alternative paths when the original path is blocked.
- Improved AO’s idle floating effect so it no longer appears static while waiting.
- Improved the process that synchronizes the external water shader with lighting.
- Improved the animation of on-screen notifications.
Cooperative Mode: Fusion 2.0 Implementation \
- Improved the process for connecting to the lobby and retrieving the list of available rooms.
- Added Syncroscope synchronization with connected clients.
- Disabled access to the communications app for clients, as they cannot send messages.
- Fixed an issue with AO offset on connected clients.
- Fixed an issue with status panels where they did not display the correct color on connected clients.
- Fixed a bug in the preventive maintenance scan, which was not propagating correctly to connected clients.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed a visual issue in the control rod drive room that sometimes allowed the reactor vessel water to be visible.
- Fixed a bug that prevents setting the power of the control rods motors to more than 100 watts.
- Fixed a bug preventing AO from finding repair points when requested to perform a scan.
- Fixed a bug in AO's startup sequence when remote control mode is activated.
- Fixed a visual bug in the shadows cast by AO when being operated remotely.
- Fixed a bug that incorrectly classified an interior zone (at the entrance to the distribution area) as the plant's exterior.
- Fixed a bug preventing the on-screen message "The internal log is intended for debugging" from being dismissed.
- Fixed a bug that allowed changing DLC options during gameplay.
- Fixed a bug that caused AO to fall off the map when remotely controlled.
- Improved the outdoor ambient lighting matrix to react more realistically to daylight.
- Improved AO's control system when operated remotely.
- Reviewed and corrected UI and help text for grammar, typos, and terminology (English localization).
Cooperative Mode: Fusion 2.0 Implementation \
- Fixed a bug in the co-op mode control app where the host was not counted as a connected player.
- Fixed a bug in the co-op lobby where players could join a room even if the host and client were running different game versions.
- Fixed a bug causing excessive network update rate, leading to client desynchronization.
- Added a notice displayed upon connecting, informing players of the current state of cooperative mode, its progress, and pending features.
- Removed the "Host" role from the cooperative mode control app, as it cannot be assigned to a connected player.
- Synced the tablet Checklist app with connected clients.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed a bug in the core wear calculation when the outer vessel is empty.
- Fixed a bug that displayed game performance statistics when typing in an input box.
- Fixed a bug when loading saved progress where the player could sometimes die from fall damage.
- Fixed a visual glitch in the control room where, in some cases, the outside could not be seen when the door was open.
- Fixed a visual issue in the smoke effect of the steam turbines.
- Fixed a visual glitch on the horizon, which generated a visual aberration in the camera.
- Improved automatic font size adjustment.
- Added an option to scan for conflicting software, with logging and risk warnings (can be disabled in the game’s options menu).
- Added support for the Island Fauna DLC.
- Added support for configuring in-game DLCs.
- Added Checklist app to the tablet (within the Status app).
- Added compatibility check with automatic reduction of visual effects for unsupported video cards.
(To bypass this check, launch the game with the -nocheckcompatibility parameter.)
Cooperative Mode: Fusion 2.0 Implementation \
- Fixed a bug when operating the boron dosing pump.
- Fixed the host role identifier in the cooperative mode control app.
- Fixed inconsistent capitalization in the player name field.
- Removed the host from the cooperative mode control app, as the host cannot be kicked.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed an issue that occurred when pressing certain buttons, where the player could become stuck.
- Fixed an issue with AO’s control of the pressurizer.
- Fixed a bug where AO would sometimes take control of the reactor after loading a saved game.
- Fixed a bug where AO would sometimes fail to properly reactivate certain tasks after loading a saved game.
- Improved the player’s responsiveness and animation when interacting with numeric keypads.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed a visual issue where rain was not visible from the Diesel Generator room.
- Fixed an issue with the scale of the Steam Jet Ejector Motive Flow Rate meter.
- Fixed an issue where a popup appeared on screen with no data.
- Fixed an issue saving the "Enable weather consequences" option.
Cooperative mode: Fusion 2.0 Implementation \
- A notification icon was added to the main menu to indicate if the user is enabled for the cooperative mode beta.
- Fixed an issue with dial-type controls that were not functioning correctly for connected clients \.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Steam Cloud synchronization for savegames has begun implementation (in progress).
- Removed the ability to create unlimited savegames. The maximum is now 7 slots available in the tablet.
Clarification: Old save files were not deleted; they are still present. However, you will not be able to create new ones if you have more than 7. You can, however, overwrite them. To manage your save files outside of the game, you can access:
C:\\Users\\USER_NAME\\AppData\\LocalLow\\Aerilian\\Nucleares\\Savegames
- Adjusted loading and synchronization messages to prevent black screens with no information during game loading.
- Fixed an issue when operating the elevator where, in some situations, the player was taken to the rooftop.
- Fixed an issue with the sprinklers where, after being repaired, they were still shown as pending repair in the maintenance report.
- Fixed an issue with the CCTV camera in the Diesel Generator room.
Cooperative mode: Fusion 2.0 Implementation \
- Fixed an issue inside the elevator when multiple players were present.
- Fixed a UI issue in co-op mode where some player elements were not displayed.
- Fixed an issue with the initial permission assignment for clients joining a room, where they were not receiving the permissions configured by the host.
- Fixed an issue with dial-type controls that were not functioning correctly for connected clients.
- Fixed an issue when synchronizing estimated demand chart data.
- Added synchronization of plant door states when a new client connects.
- Completed the implementation of elevator usage for the host and connected clients.
- Improved synchronization of available power within the plant for connected clients
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed a bug in the graduation of the steam generator meters, which appeared at 0 after loading a saved game.
- Fixed the bug of the tablet activating when the player is jumping, which left the device in an inconsistent state.
- Fixed a bug in the operational crane where movement could cause it to exceed guide limits and become stuck.
- Fixed an issue where AO, when sent to its charger, would shut down if it could not reach the charger.
Cooperative mode: Fusion 2.0 Implementation \
- Added elevator control support for connected clients (Partially).
- Added visualization of crane movements for connected clients (Partially).
- Improved how the tablet displays the applications available to clients.
Pending Cooperative mode issues:
- Clients can’t operate AO.
- Clients can’t handle objects.
- Clients can’t operate the valves manually.
- Clients aren’t fully animated yet.
- Not all visual effects are synchronized.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed an issue with the dynamic scaling of bar charts.
- Fixed an issue where tablet buttons would turn off instead of lighting up when hovered with the mouse pointer.
- Fixed a bug when saving game progress, where the savegame description entered by the player was not saved correctly.
- Fixed an issue in the title of the tablet app for managing saved progress, where it always displayed "Load Saved Progress".
- Fixed an issue in the steam generator where it could not be repaired.
- Fixed an issue where AO, when sent to its charger, would shut down and recharge in an incorrect location if it could not reach the charger.
- Optimized numeric panel controls to reduce memory and CPU usage.
Cooperative mode: Fusion 2.0 Implementation \
- Fixed an issue where steam generator meters were not displaying correctly on the client side.
- Fixed an issue where the mute alarms button was not being propagated correctly to clients.
- Fixed the condenser meters and several others that were not displaying the correct values.
- Implemented the reading of meter values in information mode (right mouse click).
- It is no longer possible to pause the game during a co-op session.
- Optimized data usage during simulator updates to improve latency and prevent desynchronization.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed an issue where energy generation statistics were not saved correctly when saving progress.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed the lag or freezing that occurred every few seconds after loading a savegame.
- Some errors in the English translation were corrected.
Cooperative mode: Fusion 2.0 Implementation \
- The "Forgot my password" function was added to the login form.
We are waiting for you in the game's Discord!
The following improvements and fixes were implemented:
- Fixed an issue with alarm panels where the corresponding light was not turning on.
We are waiting for you in the game's Discord!
Current Release
23610163
Uploaded Jun 19, 2026
System Requirements
How to Install
Nucleares.exe to play
Troubleshooting tips
• Run Redist/_CommonRedist installers if game won't start
• Add folder to Windows Defender exclusions
• Run as administrator
Download
Direct link available
4.1 GB
23610163
A66E1DBF
a071b7ee3a26147809e2740848aa9239f4d5778a29552cc8949c85daae6e234e
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View AllDownload Nucleares for PC with a direct link or via torrent. Get the full version of Nucleares for free. Nucleares is a Indie released by Iván Marcelo Pretti.