Note: Critical heat = 8500, explosion = 10 000
System components exclude SUCs.
Mk. I
This reactor can run an infinite or practically infinite number of cycles without reaching critical heat nonstop, or a system component melting.
Mk. I-I reactors can run infinite cycles based on their internal cooling.
Mk. I-O reactors require external cooling (water) to run infinite cycles.
Mk. II
This reactor can run at least one cycle nonstop without reaching critical heat, or a system component melting.
You can add a number after it (like this: Mk. II-1, II-3) to show how many cycles it can run nonstop before reaching critical heat. If the reactor can run for at least 16 cycles, you can label it Mk. II-E. (E for endless)
Mk. III
This reactor can run for at least 1000 seconds nonstop before melting system components.
Mk. IV
This reactor can run for at least 1000 seconds nonstop before exploding.
Mk. V
Quote from Alblaka
"A reactor incapable of running smoothly and solely designed to prove the fact reactors can explode."
SUCs
If your reactor (excluding breeders) require SUC, attach "-SUC" to the back.
Efficiency
How to calculate efficiency: Divide your reactor output by the number of uranium cells and then by 5. After that, attach the following letters to the back based on the following chart
Efficiency = 1: EE
Efficiency > 1, <= 2: ED
Efficiency > 2, <= 3: EC
Efficiency > 3, <= 4: EB
Efficiency > 4, <= 5: EA
Hypothetical max efficiency is 5, but current known max is 4.44.
Breeders
Negative-Breeders:
The breeder will cool down eventually, requiring lava buckets to bring them back to optimum efficency
Equal-Breeders:
Epitome of breeders. It will never cool down or heat up by more than 1000 points during a full cycle.
Positive-Breeders:
The breeder will produce excess heat and you will need to micromanage them or use SUCs to bring them back to safe levels.