HMS.U235 - Realistic Reactors

HMS.U235 – Nuclear Fission for Space Engineers ☢️

⚠️ Requires Heat Management System – U235 is an official expansion module for it.[/quote] Vanilla reactors in Space Engineers are… a box that makes power. Flip the switch, collect the watts. HMS.U235 fixes that. Now you'll learn why so many people are afraid of nuclear reactors. ☢️ [hr][/hr] [h2]☢️ What Does This Mod Do?[/h2] Replaces vanilla reactor behavior with a full nuclear fission simulation. Nuclear power is not a fossil fuel that burns at a constant rate, and this mod makes sure you feel every bit of that difference. [list] [*]4-state reactor lifecycle - reactors don't just turn on. They spin up, stabilize, and cool down. ⚪Idle → 🟠Heating Up → 🟢Running → 🔵Cooling Down. Power is only produced during Running state. Heat up consumes all reaction energy to bring the core to operating temperature, so plan your startup time into your power budget [*]Dual thermal mass - each reactor has a hot core and a structural shell. Heat flows outward from the core into the HMS heat network. Core locks at 800°C during normal operation [*]Temperature-dependent power output - cold startup means no power. Full output only once the core reaches operating temperature. Plan accordingly [*]Volume-scaled fuel consumption - larger reactors burn proportionally more fuel per batch, with power output scaling accordingly [*]Control rod auto-throttle - rods engage automatically above a configurable temperature threshold. Response follows a sqrt curve mirroring real Doppler broadening, up to 80% throttle max. Minimum 20% reaction always burns. Manual override available [*]Meltdown and structural violation - core exceeding 1250°C triggers catastrophic explosion. So does taking enough damage during any active stage. Zero cooling means inevitable meltdown regardless of control rods. Oh, and don't grind a running reactor. Just don't. ☢️💥 [*]Terminal UI - Launch/Stop buttons, Auto/Manual toggle, Control Rod Threshold slider, real-time core temp and power readout [*]Full multiplayer sync - state synchronized across all clients [/list] [hr][/hr] [h2]⚠️ Warning – This Mod Isn't for Everyone[/h2] HMS.U235 is for engineers who've already mastered HMS and are hungry for more. If you install this mod, be prepared to: [list] [*]🌡️ Babysit your core temperature - cold start, warm up, monitor, repeat [*]🎛️ Learn what control rods actually do - and why getting that threshold wrong is expensive [*]⏳ Wait for your reactor to be ready - there's no instant power here [*]💥 Rebuild after your first meltdown - and your second. Possibly your third [*]🔧 Never grind an active reactor - you have been warned [/list] If you want a plug-and-play power source, this mod is not for you. If you want to feel like a real nuclear engineer, welcome to the control room. ☢️ [hr][/hr] [h2]🏠 Heat Mods Family[/h2] [list] [*]Heat Management System - the core thermal simulation, required [*]H2Real - realistic hydrogen and oxygen [/list] [hr][/hr] [h3]💬 Suggestions / Feedback[/h3] Got ideas? Found an issue? Want a variant version? ⚡ Fastest way to reach me: join the Discord https://discord.gg/zn3k8fP5Dz 🐌 Steam Workshop comments/discussions: I do read these, but replies can take weeks to a couple of months since I can't monitor every mod's page closely. This mod is actively maintained; Discord is just where I'm actually paying attention!