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introduction to nuclear energy > 2022 MCQ > Flashcards

2022 MCQ Flashcards

1
Q

What is the KE of a fission neutron?

A

2 MeV

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2
Q

What is the KE of a thermal neutron?

A

0.023 eV

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3
Q

What is the energy release on U235 fission?

A

200 MeV

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4
Q

What is the energy of burning an carbon atom?

A

20 eV

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5
Q

What is the energy required to displace an atom in a metal lattice?

A

20 eV

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6
Q

What does probabilistic safety analyse?

A

How likely different accident sequences are.

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7
Q

Following a loss of coolant accident, a typical PWR fuel element will reach the fuel melting point (in the absence of any cooling) after typically

A

500 seconds

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7
Q

What does deterministic safety analysis address?

A

Consequences of accident sequences

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8
Q

What might be used as the coolant and the moderator in a plutonium-breeding reactor?

A

Sodium, no moderator at all

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9
Q

What reactor type is considered best suited to support the production of hydrogen?

A

HTGR (High temperature gas cooled reactor)

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10
Q

What is not a claimed feature of SMR?

A

Thermal efficiency

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11
Q

Which of the following is the least significant factor in the economic assessment of nuclear power:
Electricity Price
Thermal Efficiency
Discount Rate
Decommissioning costs

A

Decommissioning costs

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12
Q

What is the I-131 equivalence of Cs-137?

A

1TBq of Cs-137 = 40 TBq of I-131

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13
Q

How does the atomic mass vary when it undergoes fission?

A

Increases by one (neutron captured)

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14
Q

How to calculate neutron number density of core containing mixture?

A

Calculate individual neutron number density then multiply by volume ratio (make use of RVE)

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15
Q

What is k_infinity calculation?

A

SUM: v(i)n(i)sigma_f(i)
DIVIDED BY
SUM: n(i)*sigma_a(i)

16
Q

Does K_infinity inform criticality status?

A

No

17
Q

What value informs the criticality status?

A

multiplication factor (k)

18
Q

How can the multiplication factor (k) be calculated from k_infinity?

A

six sigma formulation
k_infinityP_FNLP_TNL

19
Q

What is the most important of the following factors that influences the difference between coolant temperature and clad temperature in a typical PWR in normal operation?

A

coolant density

20
Q

What is a subchannel?

A

Channel between pins

21
Q

Nuclear cogeneration systems for district heating schemes use

A

Waste water/steam from the turbine exit

22
Q

The fuels in a ‘commercially viable DT fusion reactor comprise of:

A

Deuterium and Lithium

23
Q

A prototype fusion reactor is able to maintain an ion density of 6E+20 ions/m3, at a temperature of 150E+6 K for 0.01 seconds. Which one of the following statements is true?

A

Would fail to reach ignition

24
Q

What material does not exhibit swelling?

A

Ceramic MgAl2O4

25
Q

In a supercritical water-cooled reactor, the coolant is

A

light water at 230 bar

26
Q

What is the equation for intensity?

A

I = I_0 * exp(-urhox)

27
Q
A
28
Q

True or false: Delayed neutrons are relatively rare, but extend the average neutron lifetime enough to make the reaction controllable.

A

True

28
Q

A U238 nucleus undergoes neutron capture, followed by beta-decay, and then a subsequent additional beta decay. The resulting nucleus is

A

Pu239

28
Q

If the control rods of a nuclear fission reactor are fully inserted, the nuclear chain reaction will, in normal circumstances,

A

shutdown

28
Q

What nuclear reactor type does not use a steam generator?

A

BWR

29
Q

In a PWR in which a large break loss of coolant accident occurs,

A

the core depressurizes and the liquid water flashes to steam which exits through the break

30
Q

Which of the following would not be good for providing shielding from neutrons and why?
Boron
Gadolinium
Beryllium
Carbon

A

Beryllium, smallest atomic mass

31
Q

How long does fuel remain in a PWR core?

A

5 years

32
Q

What is an advantage of natural circulation?

A

Reduced cost
Does not rely on power source

33
Q

List the following in order of decreasing fissile number density:

Natural uranium metal
U238 metal
Pu239 metal
UO2 made from natural uranium
UO2 made from pure U235

A

Pu239 metal
UO2 made from pure U235
Natural uranium metal
UO2 made from natural uranium
U238 metal

34
Q

List the following in ascending order of core coolant exit temperature:

AGR
Gas cooled fast reactor
PWR

A

PWR
AGR
Gas cooled fast reactor

introduction to nuclear energy (16 decks)

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