Patent Number: 
Section: claims

1. A method of operating a power plant having plural reactor cores, the method comprising:in a first fuel cycle:providing a fuel configuration for a first reactor core of the plural reactor cores, the providing the fuel configuration for the first reactor core including:loading the first reactor core with a first fuel assembly selected from a first batch of fuel;loading the first reactor core with a first partially spent fuel assembly from a second batch of fuel; andproviding a fuel configuration for a second reactor core of the plural reactor cores, the providing the fuel configuration for the second reactor core including:loading the second reactor core with a second fuel assembly from the first batch of fuel; andloading the second reactor core with a second partially spent fuel assembly from the second batch of fuel; andoperating the first and second reactor cores with the fuel configurations, respectively; andin a second fuel cycle, performed after a completion of the first fuel cycle:providing a new fuel configuration for the second reactor core, the providing the new fuel configuration for the second reactor core including:loading the second reactor core with a fresh fuel assembly; andloading the second reactor core with the first fuel assembly from the first batch of fuel; andoperating the second reactor core with the new fuel configuration. 2. The method of claim 1, wherein loading the second reactor core with the first fuel assembly from the first batch of fuel comprises:removing the first fuel assembly from the first reactor core; andreplacing the second partially spent fuel assembly with the first fuel assembly. 3. The method of claim 1, further comprising:in the first fuel cycle:providing a fuel configuration for a third reactor core of the plural reactor cores, the providing the fuel configuration for the third reactor core including:loading the third reactor core with a third fuel assembly selected from the first batch of fuel; andloading the third reactor core with a third partially spent fuel assembly; andoperating the first, second, and third reactor cores with the fuel configurations, respectively;wherein the providing the new fuel configuration for the second reactor core further comprises loading the second reactor core with the third partially spent fuel assembly. 4. The method of claim 3, further comprising:in the first fuel cycle:providing a fuel configuration for a fourth reactor core of the plural reactor cores, the providing the fuel configuration for the fourth reactor core including:loading the fourth reactor core with a fourth fuel assembly selected from a third batch of fuel;in the second fuel cycle:providing a new fuel configuration for the third reactor core, the providing the new fuel configuration for the third reactor core including loading the third reactor the fourth fuel assembly; andoperating the second and third reactor cores with the new fuel assemblies, respectively. 5. The method of claim 4, wherein the first batch of fuel comprises fuel associated with a first nuclear isotope, and wherein the third batch of fuel comprise fuel associated with a second nuclear isotope that is different than the first nuclear isotope. 6. The method of claim 5, wherein the first batch of fuel comprises uranium-oxide (UO2) fuel, and wherein the third batch of fuel comprises mixed uranium-plutonium oxide (MOX) fuel. 7. The method of claim 4, wherein loading the third reactor core with the fourth fuel assembly comprises:removing the third partially spent fuel assembly from the third reactor core; andreplacing the third partially spent fuel assembly with the fourth fuel assembly. 8. The method of claim 4, further comprising:after a completion of the second fuel cycleremoving the second partially spent fuel assembly from the second reactor core;removing the fourth fuel assembly from the third reactor core;loading the second reactor core with the fourth fuel assembly; andloading the fourth reactor core with the second partially spent fuel assembly. 9. The method of claim 3, wherein the third fuel assembly comprises nuclear fuel including at least one isotope of uranium, and wherein the third partially spent fuel assembly comprises nuclear fuel including at least one isotope of plutonium. 10. The method of claim 3, further comprising:removing the first partially spent fuel assembly from the first reactor core after the completion of the first fuel cycle; andloading the third reactor core with the first partially spent fuel assembly after the completion of the first fuel cycle.