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Questions and Answers
What is the advantage of using graphite as a medium in reactor cores?
What is the advantage of using graphite as a medium in reactor cores?
- It is a heterogeneous medium
- Neutrons cannot travel far in graphite
- It is expensive and difficult to obtain
- It has a longer mean free path for neutrons (correct)
What is the disadvantage of using graphite reactors for burning plutonium?
What is the disadvantage of using graphite reactors for burning plutonium?
- Graphite can have a low buildup of minor actinides
- Graphite can have a high buildup of minor actinides (correct)
- Graphite reactors have a softer spectrum than LWRs
- Graphite is not effective at slowing down neutrons
Why is predicting the behavior of neutrons in graphite challenging?
Why is predicting the behavior of neutrons in graphite challenging?
- Accurately modeling graphite behavior does not require coupling to thermal fluidics
- Neutrons cannot travel far in graphite
- Graphite has a large mean free path for neutrons (correct)
- Graphite is a heterogeneous medium
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Study Notes
- Graphite is a homogeneous and diffusive medium used in reactor cores.
- Neutrons can travel further in graphite due to its longer mean free path.
- Graphite reactors have a slightly harder spectrum than LWRs.
- Graphite reactors are good at burning plutonium but can have a high buildup of minor actinides.
- High Temperature Gas Cooled Reactors use graphite components as moderators.
- Predicting the behavior of neutrons in graphite is challenging due to its large mean free path.
- Accurately modeling graphite behavior requires discretization and coupling to thermal fluidics.
- Graphite is effective at slowing down neutrons and is low cost and widely available.
- A harder spectrum can result in a more negative temperature feedback.
- Graphite remains an important moderator material in many types of nuclear reactors.
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