The item ID for Reactor Rod in Subnautica is:
reactorrod
Used to power nuclear reactors.
The spawn code for this item is:
spawn reactorrod
The item command will add this item to your character's inventory. The item command for Reactor Rod is:
item reactorrod
To unlock this item, use the following command:
unlock reactorrod
If you wish to lock this blueprint, after having unlocked it, use the following command:
lock reactorrod