The difference being that Mark IVs are allowed to lose components to overheating, and that must be replaced before the reactor goes critical. Mark IVs still have to run at least 10% of a cycle, just like Mark IIIs. Mark IIIs have the additional condition that they must run at least 10% of a cycle (16 mins 40 secs) before reaching critical heat or losing any components. This can be done manually or by using Redstone.
#Factorio nuclear reactor full#
Mark IIIs are unable to complete a full cycle without going into meltdown and thus need to be shutdown mid-cycle in order to deal with the high amount of excess heat. Mark III reactors tend to have an emphasis on efficiency at the cost of safety. Mark II s that can run 16 times or more get the special sub-class 'E' (Mark II-E) for almost being a Mark I. For example Mark II-3 will need a cool down period after running 3 cycles in a row. The sub-class for Mark IIs denote how many cycles the design can run before reaching critical heat levels. A Mark II must complete at least one full cycle before encountering heat problems. Mark II designs produce a small amount of excess heat and will need to be given a cool down period eventually to prevent the hull reaching 85% maximum heat or melting component. Mark Is have two sub-classes: Mark I-I for design that do not rely in outside cooling in anyway and Mark I-O for those that do. Mark Is tend have a low efficiency, but that's the price of a completely safe reactor. Mark I reactors generate no excess heat each reactor tick and thus are safe to use continuously for as long as you supply Uranium.
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