How is U-235 obtained? HOW is Pu-239 produced? Give the reaction chapter for thi

Question

How is U-235 obtained? HOW is Pu-239 produced? Give the reaction chapter for this. What is a critical mass? What is the purpose of a moderator? What is the purpose of a reflector? What is the mechanism by which neutrons are slowed down in a moderator? Give two characteristics of good moderator material. Inside a nuclear reactor core, how many 12 foot fuel rods are normal? How many controlled rods are used? How does the fission neutron slow down from 2 Mev to 0.025 eV? What causes most of the tremendous heat produced in a reactor core? Where is the steam for the turbines produced? What are the only two kinds of explosions possible in a nuclear reactor? Why are coal burners more efficient than nuclear reactors? Good coolants must have four properties. What are they? What was Alfred Nobel's invention? What was the main explosive used in world war I, in world war II? What is the basic principle used to set off a nuclear explosion?

Explanation / Answer

Solution:

3) Natural uranium is obtained from uranium ores such as Pitch blende. Uranium is mostly found in rocks. Enriched Uranium is used in reactors.

4) U 238 atoms , when exposed to neutrons can be converted to Plutonium 239.

        0n1 +92U238 ---> 2 -1e0 + 94 Pu239

5) The minimum amount of fission material required to maintain a nuclear chain reaction is critical mass.

6) The purpose of a moderator is to slow down the neutrons produced in a nuclear reactor. Example: graphite or heavy water are used as moderators.

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