Name: Xを解く - レスリー・デュワン - 核廃棄物からの電力 (Solve for X - Leslie Dewan - Power from Nuclear Waste)
Uploaded: 2021-01-14T04:59:08.000Z
Duration: 11 min 18 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

転換語

think I can save the world with nuclear power.

程度の副詞

The slide is a little bit tongue in cheek, but not really.

You'd think that nuclear power would be an obvious solution

to the problem because it's a well developed technology

that produces large, scalable amounts of electricity.

But nuclear leaves us with its own very nasty problem,

which is nuclear waste, which is radioactive for hundreds

I have this nuclear reactor that can run entirely

It consumes the waste reducing its radioactive lifetime

while simultaneously generating enormous amounts

Right now, just to put some scope on the problem,

there's 270,000 metric tons of high level nuclear waste that

exists worldwide, and no one knows what to do with it yet.

above ground in spent fuel casks like this waiting for someone

We can take this spent nuclear fuel and extract almost all

of its remaining energy, which translates into a very, very

take all 270,000 metric tons of spent nuclear fuel that

exists worldwide and turn it into enough electricity

to power the entire world for 72 years-- so powering

taking into account increasing demand, while simultaneously

getting rid of almost all of its nuclear waste.

to be co-located with existing nuclear power plants.

So you can consume the waste without it ever

And this plant can also run on very low enriched fresh uranium

fuel, which let's it unlock 75 times more electricity

fueled nuclear reactor that's powered by uranium dissolved

The design is actually based on earlier work conducted

in the '50s and '60s at the Oak Ridge National Lab

They were able to successfully build and operate

a similar plant called a molten salt reactor that

And they showed that it had many safety benefits.

But the project was canceled pretty quickly thereafter

because it was bulky, had a low power density,

and it couldn't be justified on its great safety grounds

because the world hadn't yet experienced Chernobyl,

call nuclear waste isn't actually waste at all,

because it has a tremendous amount of energy left in it.

Conventional reactors, which are shown in the figure here,

are fueled by pellets of solid uranium oxide that's

The metal has to be thin so that it doesn't absorb

too many neutrons, but having a thin metal cladding

means that it's readily damaged by the radiation that's

And the accumulating damage limits the amount of time

So that's, in a way, why the nuclear waste is so dangerous,

because there's so much energy that's left in it.

from the conventional reactor, remove the metal cladding,

and dissolve the fuel pellets into a molten fluoride salt.

We don't have any cladding, any metal framework,

reduces our radioactive lifetime by a very large amount.

So conventional reactor waste is radioactive for hundreds

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Xを解く - レスリー・デュワン - 核廃棄物からの電力 (Solve for X - Leslie Dewan - Power from Nuclear Waste)

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