Solve this multiple-choice question and choose the correct option.

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Secondary (bred) nuclear fuels used in power reactors: select the correct pair. Definition: “Secondary fuel” refers to fissile material bred from fertile isotopes inside reactors. Choose the correct pair commonly identified as secondary fuels.

Difficulty: Easy

U-233 and Pu-239
U-235 and Th-232
U-235 and Pu-238
U-233 and Pu-238

Correct Answer: U-233 and Pu-239

Explanation:

Concept/ApproachFertile isotopes Th-232 and U-238 breed fissile U-233 and Pu-239 respectively under neutron capture and subsequent decay. These bred fissile nuclides are termed secondary fuels.

Final AnswerU-233 and Pu-239.

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