[2.0.43] Nuclear power stops generating suddenly with no clear cause

[bugservant]

My nuclear power setup intermittently stops generating power. All reactors instantly drop to 750°C despite having fuel, water, and proper grid connections. They slowly climb back up to 999°C over 1–2 minutes, but power generation never resumes — turbines stay idle, and the system remains dead. Reloading a previous safe and continuing from there sometimes delays the issue by a few minutes.

Setup details:
• Reactors have active nuclear fuel (not just loaded — burning)
• Stable water supply to all heat exchangers (checked fluid flow, no interruptions)
• Reactors are connected via heat pipes correctly, with 2x2 adjacency
• Heat exchangers and turbines are connected and steam is consumed when available
• Entire system is integrated into the power grid (checked poles, no isolated segments)

The issue:
All reactors simultaneously drop to 750°C. No fuel interruption. No water shortage. No grid disconnection. Just a sudden temperature drop. After climbing back up to 999°C, nothing kicks back on — no steam production, no turbine movement, no power output.

Tried:
• Rebuilding heat pipes/exchangers
• Monitoring fuel insertion timing
• Adding steam storage buffers
• Isolating nuclear setup to test grid load effect

Please note, I am now in the process of adding some extra reactors, but this does not cause nor prevent the outage from happening.

Attached: log file and save file. The save is from 1–2 minutes before the power outage occurs.

[boskid]

I am unable to reproduce any issues of what you are saying (reactors dropping to 750degC). Your save file quickly spirals down into a complete blackout because your nuclear setup is throughput limited by usage of some weak pumps between heat exchangers and steam turbines. When i replaced those pumps with a regular pipes the setup was working reliably. Temperatures of reactors seems to remain stable.