WorksheetsLFTR Generation IV Nuclear Reactors
Total questions: 21
Worksheet time: 42mins
Nuclear fission is ______ atomic nuclei.
joining
splitting
fusing
fizzing
Nuclear fusion is _______ atomic nuclei.
joining
splitting
budding
fizzing
Which is better for nuclear fission in power plants?
hydrogen
helium
thorium
iron
Which is not an advantage of nuclear fission power.
Makes no air pollution
Makes no greenhouse gases
Leaves radioactive wastes.
Need not be imported
Which is an advantage of thorium nuclear fission over uranium nuclear fission?
Can make nuclear bombs from it.
Emits no air pollution.
Emits no greenhouse gases.
Leaves less radioactive wastes.
Which is an advantage of thorium nuclear fission over uranium nuclear fission?
Has a freeze plug safety shut-off.
Emits no air pollution.
Emits no greenhouse gases.
Is useful for making nuclear bombs.
Which is easier, cheaper, and safer to mine and process for nuclear fission?
hydrogen
helium
thorium
uranium
If we emit too much greenhouse gases, like carbon dioxide (CO2) and methane (CH4), which is not true?
Most of earth will overheat.
Many Americans will migrate to cooler Canada.
Earth will have another mass extinction event.
More people will wear coats in the summer.
If an accelerator-driven thorium nuclear fission reactor loses electricity for its thermostat and controls, ____. Choose all correct answers.
It melts out of control and then explodes, leaking out radioactive poisons.
Its required neutron beam turns off, which shuts off the reactor.
A cooling fan turns off, so the liquid fluoride thorium salt melts and drains out, which stops the reactor.
It splits its cooling water into hydrogen and oxygen, which explode, causing a leak of dangerous radioactive poisons.
Which of the following was not a nuclear disaster?
Chernobyl
Three Mile Island Partial Meltdown
Fukushima Daiichi
Lawn Lake Dam
In the 1960s, the U.S. Government chose nuclear power plant designs based on uranium rather than thorium. Why?
Uranium is much more expensive.
Uranium must have expensive preprocessing to enrich its percent of 235U.
Uranium reactors are useful for making nuclear weapons.
The uranium reactor cores are cooled by pressurized water.
Today, we fear that uranium nuclear power plants would more likely proliferate (grow or spread) nuclear weapons to other ___.
animals
countries
mammals
arachnids
When a uranium nuclear reactor gets too hot, control rods are inserted between the uranium to absorb neutrons and slow/stop the fissioning. However, the control rods may get stuck, leading to a ____.
meltdown
profit
freeze over
spin
When an accelerator-driven liquid fluoride thorium reactor loses electrical power, its neutron beam turns off, so it can't produce any more 233U fuel and the reactor _____.
safely shuts off
has runaway overheating
melts or explodes
speeds up
LFTR means _____.
liquid fluoride thorium reactor
low freedom tin reactor
lunch for the reactor
light from the reactor
If a LFTR loses electrical power or starts to overheat, a freeze plug of fluoride thorium salt at the bottom would melt (partly because its cooling fan would stop), and all the fuel would safely _______ to a holding tank, shutting down the reactor.
drain
float
spin
shoot
In a LFTR, you don't have to worry about the fuel melting, because it's already _____.
liquid
gas
solid
plasma
Since LFTRs do not use pressurized water for cooling, they cannot _______.
have a steam or hydrogen explosion
freeze the fuel
keep cool enough
create steam for a turbine
LFTRs would have about one-thousandth of the ____ of conventional uranium nuclear fission reactors.
radioactive waste
electrical power output
profit
heat
Accelerator-driven LFTRs can transmute (change) the nuclear waste of other reactors to make it less radioactive or not radioactive. This is ____.
good
bad
neutral
ugly
A country investing heavily in LFTRs is ____.
China
Maryland
Virginia
Washington, D.C.
