Chapter 9 Multiple Choice Questions

1) One tonne of uranium contains an equivalent amount of energy as…

200 tonnes of coal.

1000 tonnes of coal.

25000 tonnes of coal.

50000 tonnes of coal.

2) The energy release in the fission of a ²³⁵U nucleus is about…

200 J.

20 MeV.

200 MeV.

200 eV.

3) Which process that accompanies neutron-induced fission of uranium is particularly important in controlling a reactor?

Gamma decay

Beta-delayed neutron emission

Neutrino emission

Neutron emission

4) In a pressurized water reactor, water acts both as a coolant and as a _____ .

5) Match the following symbols to the terms in the four-factors formula for the multiplication constant k_∞.

5a.

Fast fission factor

5b.

Resonance escape probability

5c.

Thermal utilization factor

5d.

Number of neutrons produced per thermal neutron absorbed

6) The amount of fissile material produced from fertile nuclei divided by the amount consumed is called the _____ _____.

7) The increase in the output of a PWR through conversion is about…

5–10%.

10–25%.

30–60%.

80–120%.

8) For breeding to be practical in a reactor, η must be greater than

1.2

2

2.2

2.6

9) Following a contained reactor accident, the radiation dose rate is 40 μSv h^-¹ at 500 m from the reactor. What is the dose rate at 2 km?

1 μSv h^-¹

2.5 μSv h^-¹

10 μSv h^-¹

20 μSv h^-¹

10) A control system for the cooling of a reactor core that depends on gravity or temperature differences, rather than on pumps, is an example of a ______ safety system.

11) Which countries are proposing to expand their nuclear power capability? Please select all that apply.

India

Germany

China

Russia

Italy

12) What is the accessible potential contribution of nuclear power to the global energy supply by 2050?

~ 2000 TWh per year

~ 3000 TWh per year

~ 5000 TWh per year

~ 10000 TWh per year

13) Which of the following statements about nuclear power are true?
Please select all that apply.

It has low associated carbon emissions.

In free market economies, finding finance for plants is easy.

Solutions to nuclear waste disposal have not been proposed.

Nuclear power provides about 10% of the world's electricity supply.

Construction and financing of small modular reactors may be easier than for 1.5 GW reactors.

14) Which of the following reactions is most likely to be used in the first commercial fusion reaction?

H + H

D + D

D + T

n + T

15) A temperature of 10⁸ °C, required for fusion to occur at a sufficient rate in a tokamak, corresponds to particle energies of…

1 keV.

10 keV.

100 keV.

1 MeV.

16) In which of the following ways can plasmas be contained on Earth?
Please select all that apply.

By magnetic fields

By inertia

By advanced composite materials

By electrostatic fields

17) Which of the following are sources of tritium?
Please select all that apply.

The oceans

Natural gas

Lithium

Beryllium

18) Which of the following statements about a tokamak fusion reactor are correct?
Please select all that apply.

The containment time is affected by turbulence

The induced radioactivity in the containment wall is a significant hazard.

Neutrons deposit most of their energy within the containment wall.

Making a tokamak a divertor tokamak and providing sufficient plasma heating can give about twice the containment time.

Increasing the size of a tokamak is expected to increase the containment time.

19) 200 kg of deuterium and 300 kg of tritium would produce about…

0.5 GWy of electricity.

1 GWy of electricity.

2 GWy of electricity.

5 GWy of electricity.

20) Resources on land are sufficient to provide the world through controlled fusion…

3 TWy annually for 100 years.

3 TWy annually for 300 years.

3 TWy annually for 1000 years.

3 TWy annually for 5000 years.

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