2022 MCQ

Question 1

What is the KE of a fission neutron?

Answer 1

2 MeV

Question 2

What is the KE of a thermal neutron?

Answer 2

0.023 eV

Question 3

What is the energy release on U235 fission?

Answer 3

200 MeV

Question 4

What is the energy of burning an carbon atom?

Answer 4

20 eV

Question 5

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

Answer 5

20 eV

Question 6

What does probabilistic safety analyse?

Answer 6

How likely different accident sequences are.

Question 7

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

Answer 7

500 seconds

Question 7

What does deterministic safety analysis address?

Answer 7

Consequences of accident sequences

Question 8

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

Answer 8

Sodium, no moderator at all

Question 9

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

Answer 9

HTGR (High temperature gas cooled reactor)

Question 10

What is not a claimed feature of SMR?

Answer 10

Thermal efficiency

Question 11

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

Answer 11

Decommissioning costs

Question 12

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

Answer 12

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

Question 13

How does the atomic mass vary when it undergoes fission?

Answer 13

Increases by one (neutron captured)

Question 14

How to calculate neutron number density of core containing mixture?

Answer 14

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

Question 15

What is k_infinity calculation?

Answer 15

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

Question 16

Does K_infinity inform criticality status?

Answer 16

No

Question 17

What value informs the criticality status?

Answer 17

multiplication factor (k)

Question 18

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

Answer 18

six sigma formulation
k_infinityP_FNLP_TNL

Question 19

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?

Answer 19

coolant density

Question 20

What is a subchannel?

Answer 20

Channel between pins

Question 21

Nuclear cogeneration systems for district heating schemes use

Answer 21

Waste water/steam from the turbine exit

Question 22

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

Answer 22

Deuterium and Lithium

Question 23

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?

Answer 23

Would fail to reach ignition

Question 24

What material does not exhibit swelling?

Answer 24

Ceramic MgAl2O4

Question 25

In a supercritical water-cooled reactor, the coolant is

Answer 25

light water at 230 bar

Question 26

What is the equation for intensity?

Answer 26

I = I_0 * exp(-u*rho*x)

Question 28

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

Answer 28

True

Question 28

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

Answer 28

Pu239

Question 28

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

Answer 28

shutdown

Question 28

What nuclear reactor type does not use a steam generator?

Answer 28

BWR

Question 29

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

Answer 29

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

Question 30

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

Answer 30

Beryllium, smallest atomic mass

Question 31

How long does fuel remain in a PWR core?

Answer 31

5 years

Question 32

What is an advantage of natural circulation?

Answer 32

Reduced cost Does not rely on power source

Question 33

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

Answer 33

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

Question 34

List the following in ascending order of core coolant exit temperature: AGR Gas cooled fast reactor PWR

Answer 34

PWR AGR Gas cooled fast reactor