Power Systems
A CANDU reactor uses

  natural uranium as fuel and heavy water as moderator and coolant.
 only fertile materials.
 enriched uranium as fuel and ordinary water as moderator and cooler.
 highly enriched uranium as fuel and water as moderator and coolant.

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Power Systems
The incremental fuel costs for two generating units G1 and G2 are given by Ic1 = 25 + 0.2 PG1 and Ic2 = 32 + 0.2 PG2, where PG1 and PG2 are real powers generated by the units. The economic allocation for a total load of 250 MW, neglecting transmission loss, is given by

 PG1 = 142.5 MW and PG2 = 107.5 MW
 PG1 = 109.75 MW and PG2 = 140.25 MW
 PG1 = 125 MW and PG2 = 125 MW
 PG1 = 100 MW and PG2 = 150 MW

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