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

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Fast-neutron reactor moderation requirement: identify the correct moderator choice. Context: Reactor designed to operate with fast neutrons using highly enriched fuel. Choose the correct statement about the moderator.

Difficulty: Easy

Heavy water is required
Graphite is required
Carbon dioxide is required
No moderator is needed

Correct Answer: No moderator is needed

Explanation:

ConceptFast reactors rely on fast neutrons for fission and therefore deliberately avoid slowing (moderating) neutrons. Highly enriched fuel enables a self-sustaining chain reaction without a moderator.

Final AnswerNo moderator is needed.

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