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