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Fukushima nuclear accident - Quiz
Contributed by: Ellison
  • 1. When did the Fukushima nuclear accident begin?
A) 12 March 2011
B) 11 March 2011
C) 11 March 2010
D) 11 March 2012
  • 2. What was the primary cause of the Fukushima nuclear accident?
A) Human error by plant operators
B) Cyber attack on the power grid
C) Design flaw in the reactor
D) Tōhoku earthquake and tsunami
  • 3. Which organization compared the Fukushima accident to the Chernobyl disaster?
A) United Nations Scientific Committee on the Effects of Atomic Radiation
B) International Atomic Energy Agency
C) World Health Organization
D) Greenpeace International
  • 4. How many reactors were at the Fukushima Daiichi Nuclear Power Plant?
A) Seven
B) Five
C) Six
D) Four
  • 5. What material is used for fuel assembly cladding due to its low neutron cross section?
A) Uranium dioxide
B) Stainless steel
C) Boron carbide
D) Zircaloy
  • 6. What gas is produced when Zircaloy is oxidized by steam above 1,200 °C?
A) Carbon dioxide
B) Oxygen
C) Nitrogen
D) Hydrogen
  • 7. What was the estimated cost for clean-up and compensation as of 2016?
A) 5 trillion yen
B) 50 trillion yen
C) 20 trillion yen
D) 10 trillion yen
  • 8. According to the text, how many people were displaced following the accident?
A) At least 80,000
B) Exactly 100,000
C) Over 500,000
D) At least 164,000
  • 9. What is the normal operating temperature of the reactor components mentioned?
A) 286 °C
B) 1,200 °C
C) 500 °C
D) 100 °C
  • 10. Which units were operating at the time of the earthquake?
A) Units 1–6
B) Unit 1 only
C) Units 1–3
D) Units 4–6
  • 11. What triggered the controversy regarding the cooling water?
A) Cost of water filtration
B) Disposal of treated wastewater
C) Contamination of local groundwater
D) Scarcity of fresh water
  • 12. What was a major fault identified in the investigations?
A) Lack of employee training
B) Intentional sabotage
C) Poor construction materials
D) Lapses in safety and oversight
  • 13. How many evacuees from Fukushima were still living as evacuees ten years later?
A) Over 100,000
B) Exactly 10,000
C) Less than 5,000
D) Over 41,000
  • 14. What is the result of the reaction between boron carbide and stainless steel in the context of the accident?
A) Exothermic reaction contributing to overheating
B) Formation of a protective layer
C) Cooling of the reactor core
D) Neutralization of radiation
  • 15. What happens to the reactor pressure vessel in an emergency regarding the turbines and main condenser?
A) It is automatically isolated from them.
B) It is connected to the turbines.
C) It is shut down immediately by the condenser.
D) It continues to function with the main condenser.
  • 16. What powers the secondary condenser system for reactor cooling?
A) It is powered by steam-driven turbines only.
B) It does not need external power or generators.
C) It is powered by a backup diesel generator.
D) It is powered by the main electrical grid.
  • 17. In the isolation condenser (IC) system, how is condensed coolant fed back into the vessel?
A) By gravity.
B) By steam pressure.
C) By electrical pumps.
D) By a motorized mechanical arm.
  • 18. What system replaced the IC system in units built after Unit 1?
A) Emergency turbine condensation system.
B) Reactor core isolation cooling (RCIC) system.
C) Pressurized water injection system.
D) Passive cooling heat exchanger.
  • 19. What provides the power for the pump in the RCIC system?
A) Gravity-fed mechanical springs.
B) A turbine driven by reactor steam.
C) An electric motor.
D) Stored battery power.
  • 20. Where can the RCIC system draw coolant from if the external storage tank is depleted?
A) The main condenser.
B) The reactor pressure vessel drain.
C) The external fire protection system.
D) The suppression chamber (SC).
  • 21. What type of power is required for the RCIC system to receive parameters and indications?
A) Alternating current (AC).
B) Mechanical hydraulic pressure.
C) Direct current (DC).
D) High-voltage steam energy.
  • 22. What is required to power the isolation valves in the RCIC system?
A) Direct current (DC).
B) Steam-driven hydraulic pressure.
C) Alternating current (AC).
D) Compressed air only.
  • 23. After venting the reactor to lower pressure, what system is used to replenish water?
A) The fire protection system.
B) The isolation condenser system.
C) The main turbine cooling loop.
D) The secondary RCIC pump.
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