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1. What are the advantages of chemical shim over fixed burnable poisons? What are the advantages of fixed burnable poisons over chemical shim? 2. Explain

  • 1. What are the advantages of chemical shim over fixed burnable poisons? What are the advantages of fixed burnable poisons over chemical shim?
  • 2. Explain all of the Xe-135 production mechanisms in an operating nuclear reactor.
  • 3. Describe how equilibrium Sm-149 concentration varies with reactor power level.
  • 4. Describe the difference between a grey neutron absorbing material and a black neutron absorbing material.  Why could a grey neutron absorbing material control rod be preferred over a black neutron absorbing material control rod? 

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