A nuclear power plant cannot run at say 10% to just power its own systems after it was separated from the grid. That's why diesel generators and batteries are s

A nuclear power plant cannot run at say 10% to just power its own systems after it was separated from the grid. That's why diesel generators and batteries are so important to keep the reactor from melting. It's hard to find a source on this, I apologize. The reason is that it only has large turbines to generate power, and these cannot be operated for arbitrary power output.