NUEN 304 Exam 3 | UPDATED Questions with 100% Verified Answers
Question:
A. Equilibrium concentration of Sm-149 is independent of
neutron flux and power level
Answer:
DESCRIBE how equilibrium samarium-149 concentration varies with a reactor power level
A. Equilibrium concentration of Sm-149 is independent of neutron flux and power level
B. The buildup of Samarium-149 after shutdown does not depend upon the power level
before shutdown
C. Equilibrium concentration of Sm-149 depends on the neutron flux and power level
Question:
B. After shutdown, 149Sm builds up as the accumulated 149Pm
decays.
Answer:
DESCRIBE how samarium-149 concentration changes following a reactor shutdown from
steady-state conditions.
A. The amount of Sm149 is increasing sharply as soon as the system is brought back to
critical after shutdown
B. After shutdown, 149Sm builds up as the accumulated 149Pm decays.
C. Because Sm149 is unstable, it will decay after reactor shutdown
Question:
A. Samarium-149 does not peak as Xenon-135 does, but
increases slowly to a maximum value
Answer:
DESCRIBE how samarium-149 concentration changes following a reactor startup
A. Samarium-149 does not peak as Xenon-135 does, but increases slowly to a maximum
value
B. Equilibrium concentration of Sm-149 depends on the neutron flux and power level
C. The amount of Sm149 is increasing sharply as soon as the system is brought back to
critical after shutdown.
, Question:
A. 20 days
Answer:
The equilibrium concentration and the poisoning effect build to an equilibrium value
during reactor operation for Sm is reached in approximately at what time?
A. 20 days
B. 10 days
C. 40 days
D. 10 hours
Question:
False
Answer:
T or F: The concentration of Sm149 remains essentially constant after the reactor
shutdown
Question:
False
Answer:
T or F: Helium- 3 does not have a significant effect on the reactivity of a reactor
Question:
C. Sm-149 is in the decay chain of the fission product
neodymium 149
Answer:
How samarium-149 is produced during reactor operation?
A. The fission yield of samarium 149 is high
B. Sm- 49 is a direct fission product
C. Sm-149 is in the decay chain of the fission product neodymium 149
Question:
C. It is produced directly by some fission
D. It is produced by tellurium-135 decay chain
Question:
A. Equilibrium concentration of Sm-149 is independent of
neutron flux and power level
Answer:
DESCRIBE how equilibrium samarium-149 concentration varies with a reactor power level
A. Equilibrium concentration of Sm-149 is independent of neutron flux and power level
B. The buildup of Samarium-149 after shutdown does not depend upon the power level
before shutdown
C. Equilibrium concentration of Sm-149 depends on the neutron flux and power level
Question:
B. After shutdown, 149Sm builds up as the accumulated 149Pm
decays.
Answer:
DESCRIBE how samarium-149 concentration changes following a reactor shutdown from
steady-state conditions.
A. The amount of Sm149 is increasing sharply as soon as the system is brought back to
critical after shutdown
B. After shutdown, 149Sm builds up as the accumulated 149Pm decays.
C. Because Sm149 is unstable, it will decay after reactor shutdown
Question:
A. Samarium-149 does not peak as Xenon-135 does, but
increases slowly to a maximum value
Answer:
DESCRIBE how samarium-149 concentration changes following a reactor startup
A. Samarium-149 does not peak as Xenon-135 does, but increases slowly to a maximum
value
B. Equilibrium concentration of Sm-149 depends on the neutron flux and power level
C. The amount of Sm149 is increasing sharply as soon as the system is brought back to
critical after shutdown.
, Question:
A. 20 days
Answer:
The equilibrium concentration and the poisoning effect build to an equilibrium value
during reactor operation for Sm is reached in approximately at what time?
A. 20 days
B. 10 days
C. 40 days
D. 10 hours
Question:
False
Answer:
T or F: The concentration of Sm149 remains essentially constant after the reactor
shutdown
Question:
False
Answer:
T or F: Helium- 3 does not have a significant effect on the reactivity of a reactor
Question:
C. Sm-149 is in the decay chain of the fission product
neodymium 149
Answer:
How samarium-149 is produced during reactor operation?
A. The fission yield of samarium 149 is high
B. Sm- 49 is a direct fission product
C. Sm-149 is in the decay chain of the fission product neodymium 149
Question:
C. It is produced directly by some fission
D. It is produced by tellurium-135 decay chain
