Identify the incorrect statement regarding fast breeder reactors__________________?
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Answer: E. use water as coolant
Explanation
Fast breeder reactors require unmoderated neutron spectra and utilize liquid metal coolants instead of water. Water acts as a strong neutron moderator, which slows down neutrons and defeats the fast breeder design. Liquid metal coolants such as sodium permit fast neutron energies while removing heat efficiently. Water is widely used as a coolant and moderator in conventional pressurized and boiling water reactors. Fast reactors eliminate moderators entirely to maintain high-energy neutron fluxes necessary for efficient breeding. Liquid sodium is transparent to fast neutrons and provides superior thermal conductivity without moderation.
Identifying incorrect statements about reactor design helps engineers prevent critical safety and operational failures. Selecting the appropriate coolant ensures that neutron physics requirements match the thermal hydraulic system design. Power plant designers must avoid using water in fast reactors to prevent unintended neutron moderation. Operating at extremely high power densities is a true and defining characteristic of fast breeder reactors. Being liquid-metal cooled is a correct statement describing standard fast reactor coolant selection. Producing more fuel than they consume accurately describes the core definition of a breeder reactor.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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