(03)     1.         An energy producing nuclide that could be used as fuel for a nuclear reactor is

a.         ²³⁴U

b.         ²³⁵U

c.         ²³⁸U

d.         ²³⁹U

 

(03)     2.         Slow neutrons are used to initiate fission in a nuclear reactor because

a.         the use fast neutrons could lead to a nuclear detonation of the fuel.

b.         the use of thermal neutrons prevents the production of ²³⁹Pu, lowering the

risk of nuclear weapons proliferation.

c.         the probability of fission in fissile materials is higher at low neutron

energies.

d.         the probability of fission in the coolant is high for fast neutrons.

 

(03)     3.         The cladding of the fuel elements in a nuclear reactor

a.         should be made of an insulating material to prevent the flow of heat from

the fuel to the coolant.

b.         should consist of a material with a high efficiency for absorbing neutrons.

c.         serves as the primary barrier preventing fission products (fission

fragments) from entering the coolant.

d.         serves as the primary barrier preventing neutrons from entering the

coolant.

 

(03)     4.         The moderator in a nuclear reactor

a.         is used to slow neutrons down.

b.         acts as a chemical buffer to control the acidity of the coolant.

c.         should contain high mass number materials.

d.         should never be allowed to come in contact with the coolant.