Just so you know, section headers (such as "==Fuel Rods==" on the Nuclear Reactor page) act just like -id="Fuel Rods". An anchor will always work if it's set to a section header exact name.
But thanks anyway! Don't hesitate if you have any questions.
EDIT: my bad! the anchor to the Nuclear Reactor#Fuel Rods wasn't working because this particular header has bold/big font style set inside the header... So the solution would've been to add this to the anchor (like [[Nuclear Reactor#<big>'''Fuel Rods'''</big>]], not pretty) or to do what you did. Anyway, thanks for your edits. Either way soon each fuel rod will have its own page and this won't be a problem anymore.