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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.

Q: 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.

Concept Fast 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 Answer No moderator is needed.

Difficulty: Easy

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

Correct Answer: No moderator is needed

Explanation:

Concept
Fast 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 Answer
No moderator is needed.

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