Nova (1974–…): Season 44, Episode 9 - The Nuclear Option - full transcript
Five years after the earthquake and tsunami that triggered the unprecedented trio of meltdowns at the Fukushima Daiichi nuclear power plant, scientists and engineers are struggling to control an ongoing crisis. What's next for Fukushima? What's next for Japan? And what's next for a world that seems determined to jettison one of our most important carbon-free sources of energy? Despite the catastrophe-and the ongoing risks associated with nuclear-a new generation of nuclear power seems poised to emerge the ashes of Fukushima. NOVA investigates how the realities of climate change, the inherent limitations of renewable energy sources, and the optimism and enthusiasm of a new generation of nuclear engineers is looking for ways to reinvent nuclear technology, all while the most recent disaster is still being managed.
never stop burning.
The nation has an insatiable
need for energy,
but virtually no natural
resources to generate it.
To meet demand here,
they bet big on nuclear power.
We blindly believed
nuclear plants
were completely safe,
immune from accidents,
and the cheapest
source of energy.
But the meltdowns at Fukushima
Daiichi changed everything.
To avoid another Fukushima,
we should close
all nuclear plants.
Like the rest of the world,
Japan is at a crossroads.
Can they get along
without nuclear?
Sure.
The price is going to be
very, very high for them.
Wind and solar
are not going to run
the Ginza lights.
How will we power the planet
without wrecking the climate?
If you really do
wish to do something
about climate change,
nuclear is the path.
We don't use nuclear, because we
got freaked out in the '70s.
No more nukes!
There are some innovative ideas
on the drawing boards.
For my generation,
we are much more concerned
about climate change
and global warming.
We're not going
to rule anything out
because the issue
is so important.
But given its checkered past,
how realistic is atomic power?
Are we ready
for the "Nuclear Option"?
Right now on NOVA.
Breaking news...
a violent earthquake
off Japan's northeast coast
has rocked the nation.
A 7.9 earthquake in Japan,
a powerful...
It began with an epic earthquake
at sea...
...which spawned a giant
tsunami...
...a 45-foot high wall of water.
It rolled over the Fukushima
Daiichi nuclear power plant...
...triggering a cascade
of failures.
Three hydrogen gas explosions.
Three meltdowns.
The uncontrolled release of
radioactivity into the ocean
and into the air.
It contaminated
a huge swath of land...
...prompting the evacuation
of more than 100,000 people
in a 12-mile radius.
The worst affected areas,
northwest of the plant,
remain off-limits, abandoned.
No one will be able to live here
for a very long time.
As the groundwater
passes through the plant,
it gets mixed in
with the contaminated water...
It's now been nearly six years
since the meltdowns
at Fukushima.
I've been reporting on this
since it happened.
Six trips in as many years.
I've traveled up and down
the desolate evacuation zone.
We are about a kilometer from
the Fukushima Daiichi plant,
geing particularly high
readings here...
34 microsieverts per hour.
Victims who lost so much in
the earthquake and tsunami
in limbo, unsure when, or if,
they can return home.
I lost three family members...
my mother, my wife,
and my oldest son.
I thought if we fixed the house,
we could return here to live.
I thought that when we left.
But now that I see it,
there's no way, no way.
And many are understandably
opposed to nuclear power.
From now on, I don't want them
to build another nuclear plant
ever again.
That is a sentiment
shared all over Japan.
In Tokyo, the drumbeat
remains steady.
Protesters still
regularly gather
outside the prime minister's
office to demand
a permanent shutdown
of all the nuclear power plants.
The owner of Fukushima,
the Tokyo Electric
Power Company, or TEPCO,
is pushing hard for permission
to restart another
sprawling nuclear power facility
on the west coast of Japan.
The Kashiwazaki-Kariwa
atomic plant is the largest
in the world.
Or was.
Today at KK,
the operators are
simulating disasters.
But the plant remains closed,
like nearly every other nuclear
power facility in Japan.
After the meltdowns
at Fukushima,
TEPCO invested heavily
in safety upgrades here:
a 50-foot-high seawall;
and watertight doors;
on high ground,
a fleet of backup generators
and fire engines;
and a five-million-gallon
holding pond,
designed to keep water flowing
down to the reactor cores
as a last resort.
The price tag...
nearly $5 billion.
Despite all of that,
the provincial governor
is opposed to a restart,
as are most people
who live here.
I have young children.
In my opinion, nuclear plants
should be eliminated.
Honestly, I don't want them
to resume.
With the impact of Fukushima,
I don't want to use nuclear
plants in the future.
Before the Fukushima disaster,
Japan derived 30%
of its electricity
from 54 nuclear reactors.
There were extensive plans
to build two dozen more.
The goal... generate
half of their electricity
with nuclear by 2030.
Now the nation relies
on imported fossil fuels
to fill the gap.
Japan is at a crossroads.
And so is the rest of the world.
How can we answer
the relentless demand
for more energy
without burning fossil fuels,
the chief culprit
in global warming?
Unlike fossil fuels, nuclear is
a potent source of energy
that does not generate
any of the greenhouse gases
like carbon dioxide that
trap heat in the atmosphere,
warming our planet.
A nuclear reactor is fueled
by uranium, an element
that naturally splits apart,
releasing atomic particles
called neutrons.
It's called fission.
And uranium fission
can induce more fission.
When a loose neutron fires
into a nearby uranium nucleus,
the atom becomes unstable
and quickly splits.
Each time an atom splits
it generates heat.
It's used to boil water.
The steam turns turbines,
generating electricity
without releasing
any carbon dioxide
into the atmosphere.
Renewable sources of energy may
seem like safer, simpler ways
to generate carbon-free power.
But without a practical means
of storing what they produce,
are they reliable enough?
We expect electricity on demand.
What happens when the sun
doesn't shine?
What happens when the wind
doesn't blow?
We don't have
a battery technology
that can meet the rigorous
performance requirements
of the grid...
namely, super-low cost
and super-long service lifetime.
But we have so little storage
now that even if it grows
very rapidly, it'll be a long
time before it has a big impact.
We need to have
base load carbon-free power.
And nuclear is a great example
of something that is
base load carbon-free power.
But since the dawn
of the nuclear age...
That signal means to stop
whatever you're doing
and get to the nearest
safe place fast.
...fear of atomic bombs,
radiation, and concerns about
storing the radioactive waste
have made nuclear power
seem too risky.
- No more nukes!
- No more nukes!
No more nukes!
Fukushima is a lesson
in what happens
when these hypothetical risks
become all too real.
It was one of the largest
nuclear power plants
in the world.
Today it is still a busy,
crowded workplace,
but now a dangerous
decommissioning site.
My invitation to see it up close
was unique.
What next?
Does three have a lot?
Yes, yes...
But even with
special permission,
getting inside is not easy,
by design.
Radioactive contamination
has gone down,
but not nearly enough to
dispense with the Tyvek suits,
three layers of socks,
and gloves,
and full face respirators.
4,000 workers endure
the ritual every day.
They work long and hard
without access
to water or a toilet.
It's like being an astronaut
on a spacewalk.
But this mission is
less scripted and rehearsed.
There is no playbook.
The biggest challenge
is that we've never done
anything like this.
No one in the world
has this experience.
Naohiro Masuda
is TEPCO's
Chief Decommissioning Officer...
the man in charge of this
unprecedented cleanup.
It's neither a job he sought,
nor could have imagined
when he began working
for the utility 30 years ago.
My generation joined the company
to generate electricity
with nuclear power.
That was our purpose in life.
So when it comes
to decommissioning work,
I feel there's a bit
of a dilemma, like,
what is our goal here?
And we still need to decide
what we're going to do.
For that, we need to rely
on the knowledge of people
around the world.
He relies heavily on this man.
For them to come out and to
publicly say, "We need help,"
is different for them.
Lake Barrett is one of
a very select group
who has some experience
wi a job like this.
There was an accident
at the Three Mile Island
nuclear power plant...
The Nuclear Regulatory
Commission appointed him
to manage the decommissioning
of Three Mile Island Unit 2
after it melted down in 1979,
releasing a negligible amount of
radiation into the atmosphere.
There's a lot of similarities
between TMI and Fukushima,
and there's also
a lot of differences.
Fukushima is much more complex.
The damage is much greater.
There's three melted cores.
But the fundamentals
of how you address this
and how you recover are similar.
We are now five feet
into the core.
Boy, a lot of debris.
So where is the melted fuel
at Fukushima?
In the type of reactors
that were built there
the uranium fuel sits
inside rods, underwater,
in a steel pressure vessel,
surrounded
by a concrete and steel
containment structure
inside a reactor building.
All those layers of protection
are there in case
the cooling water stops flowing.
If that happens,
it quickly boils away,
exposing the fuel,
and it melts,
turning into radioactive magma.
Engineers have sent
robotic cameras
into the containment structure
to try to get a glimpse,
but the cameras quickly fail
after they are bombarded
by radiation.
They do know the damaged cores
are inside
their containment structures,
but it is likely
that they melted through
the reactor pressure vessels
onto the concrete floor below.
Is it in one big vertical lump
on the floor underneath it,
or did it come down
and flow like lava in a volcano,
and move out to the sides?
We don't know yet.
Answering the question
won't be easy.
It's just too hazardous to get
anywhere near the melted fuel.
But a team of scientists
and engineers from the Ios
Alamos National laboratory
is helping TEPCO
get some answers.
Channel seven's on?
Channel seven's on.
They are building
a sensing device
that detects muons,
which begin as
subatomic particles
in outer space before reaching
the Earth's atmosphere.
They can be used as a tool
to see the melted uranium fuel.
Muons are stopped...
slowed...
or deflected, depending on
the density of the matter
they are passing through.
Muons are like heavy electrons.
They don't have
a nuclear interaction.
In this demonstration,
they used muon detectors
to create an MRI-like image
of this half sphere of lead.
At Fukushima,
muon detectors like these,
placed strategically around
the very dense uranium cores,
can work together to pinpoint
the location and shape
of the melted fuel.
The technique works...
in simulations.
We can see where the core was,
we can see the bottom
of the pressure vessel,
and we can see
if there's material
in the core region,
if there's material
that's in the bottom
of the pressure vessel.
And we can actually measure
if there's any uranium there,
if there's a lot of uranium
there, how much is left.
So this is really good news.
The detectors will be run
for months to gather
sufficient data
to give engineers
the sharpest possible picture
inside a lethally
hazardous place
that none of them
can ever visit.
At Fukushima right now,
the most urgent problem
is water...
a steady torrent
of radioactive water.
The plant is wedged between a
mountain range and the Pacific.
When the rain falls,
it flows toward the ocean
on the surface and underground.
The earthquake on March 11, 2011
created numerous breaches
in the basements
of the reactor buildings.
To keep the melted
uranium cores cool,
TEPCO pumps in 100,000 gallons
of water each day.
The water touches the core,
becomes highly contaminated,
and flows out through
these penetrations that are
leaking onto the floor
of the reactor building.
That's where it mixes
with groundwater that has seeped
into the basement.
100,000 gallons of water is
contaminated each and every day.
To keep it from leaking
into the ocean,
they employ a network of pumps,
sending the water
through a series
of huge filtering plants
that use various types
of fine-grained materials
that naturally attract and bind
with radioactive elements.
They remove cesium, strontium,
plutonium and about 60 others.
All that remains is
a radioactive form of hydrogen
called tritium.
Tritium is very hard.
It's in water itself.
That's something that
you just can't remove
by any methods that I know of
in a straightforward way
on that scale.
So they're going to have
to release it.
Dangerous as that may sound,
scientists say the risk
is relatively low.
Tritium was not released
in very high quantities
from Fukushima
relative to what we released
in the atmosphere in the 1960s
when we blew off hydrogen bombs.
There was a lot of tritium
put into our oceans.
So we're going to be adding in
a small amount of tritium
to an ocean
that already has tritium in it.
In the meantime,
they are storing
the tainted water in tanks.
Lots of tanks.
They have to finish
construction of a new one about
every other day to keep up.
A plateau above
the destroyed reactors
now brims with more than
1,000 of them.
They hold more than
264 million gallons of water.
While TEPCO has enough space to
keep building them for years,
it is clearly not
a sustainable solution,
and yet the government has
refused to issue a permit
that would allow the utility
to start draining the tanks.
To get there, they're going
to have to rebuild
the public confidence
that they understand
and trust the people that are
telling them these messages.
And ultimately that people
realize you can't just
keep building tanks forever...
there has to be a limit.
Meanwhile, TEPCO
is desperately trying to reduce
the amount of groundwater
that becomes contaminated
in the first place.
They have encircled
the damaged reactors
with 1,500 pipes
that go 100 feet deep.
They are filled with coolant
that is 22 degrees
below zero, creating a mile-long
underground barrier
of frozen soil.
The hope is it will deflect
the groundwater
away from the melted fuel.
But why ice?
Me
that I was being assigned here,
I had my doubts.
But there are a large number
of buried pipes
and cables around
the nuclear reactor buildings.
So it's not possible
to use a continuous wall
of steel or concrete
underground.
The technique is routinely used
on construction sites
to temporarily stabilize
the ground.
But nothing at this scale,
designed to work for years,
has ever been tried before.
My concern is, if you have water
flowing through the site
and you build a barricade,
does TEPCO really understand
where that water goes?
Is it going to go over the wall,
is it going to go
under the wall, is it going to
go around the wall?
In March of 2016,
they turned it on,
but the groundwater
is still seeping in.
No one knows
if it will ever work.
The engineers here face
huge challenges ahead.
The job won't be finished
for 30 or 40 years.
Nothing of this magnitude has
ever been done before.
It can be done, I believe,
with the technologies that exist
and will be developed
as we go forward.
But no, nothing
of this magnitude has ever
been done by mankind.
They are being watched
by a scared, skeptical populace.
And unfortunately,
scientists can offer
little reassurance.
Biophysicist David Brenner
is Director
of the Center for
Radiological Research
here at Columbia University
Medical Center.
In my opinion,
everybody who lived
in Fukushima prefecture
and even outside who got
some very low level
of radiation exposure,
and that's pretty well
everybody, would be subject
to a very small increase
in cancer risk.
But beyond that,
scientists cannot say
anything conclusive about
their long-term risk
of developing cancer
or genetic defects.
The individuals in Fukushima
prefecture want to know,
"what are the real effects
of the radiation
that I was exposed to?"
And we can't give them
the answers that they need,
and that's a really
unfortunate situation.
I personally find it
a very frustrating situation.
About 18,000 people died
as a result of the earthquake
and tsunami on March 11, 2011.
But no one has died
by radiation from the meltdowns.
So, is the lesson of Fukushima
to stop, or to build better,
safer nuclear plants?
Plants that employ a host
of new technologies
that matured long after
most of our current fleet
of nukes was designed?
I think the right interpretation
of the accident at Fukushima
is we should go all out
on nuclear innovation.
If the Japanese had replaced
these elderly plants
with modern plants, Fukushima
wouldn't have happened.
The first reactors
at Fukushima Daiichi
were designed and built
when this technology
was still young.
The Fukushima plant
designed in the 1960s
was literally
a slide-rule-era plant.
You know, there's
a few calculations in that era
they could have done
on a mainframe,
but that mainframe
has less power than...
certainly than you do
in your cell phone.
The design that failed
at Fukushima
is an early model
boiling water reactor.
There are currently 32 reactors
of this vintage
still running in the world.
In all there are about
450 nuclear reactors
generating 11%
of the planet's electricity.
In the U.S., nuclear power
fills about 20%
of the nation's power demand.
The vast majority
of nuclear power plants
were built with technology
and techniques
from the '60s and '70s
and are water-cooled.
Despite steady improvements
over the years,
water-cooled reactors
still have
a serious vulnerability...
a station blackout that stops
the crucial pumps that keep
cooling water flowing.
This is what happened
at Fukushima.
To make fission robust enough
to generate power,
uranium is enriched,
shaped into pellets,
and then stacked into fuel rods.
This ensures
lots of uranium atoms
are close enough to each other
to allow
a healthy chain reaction.
To manage the rate
of the reaction,
control rods
that absorb neutrons
are moved in and out of spaces
among the fuel.
During an emergency shutdown,
or SCRAM, the control rods
are pushed all the way in,
terminating the chain reaction.
The earthquake
of March 11, 2011,
prompted an automatic SCRAM
at Fukushima.
But it also brought down
the crucial transmission lines
that connected the plant
to the power grid.
Then the tsunami waves
wiped out the emergency backups,
the generators and batteries
designed to keep electric pumps
pushing water over the reactor
cores while they cooled down.
Currently, the existing
fleet of reactors use pumps
and diesel generators
and AC and DC power
to provide the cooling
to the nuclear reactor core.
If you lose connection
to the grid,
essentially you have no way
of cooling that core.
Jose Reyes is a nuclear engineer
at Oregon State University.
In the early 2000s,
he and his team
partnered with
Westinghouse Toshiba
to design the prototype
for a new generation
water-cooled nuclear reactor
called the AP1000.
It has an emergency water
reservoir above the reactor.
It is designed
to prevent a meltdown
for as long as 72 hours,
using gravity and convection,
but no electricity.
If the reactors at Fukushima
could have coped for that long,
the meltdowns
would not have happened.
Four of these AP1000s
are now under construction
in Georgia and South Carolina,
and four more in China.
So what you're looking at here
is the reactor vessel
in the center...
But more recently,
Reyes is focused on smaller
and, he thinks, better things.
He is the cofounder
and chief technology officer
for an Oregon-based company
called NuScale.
In our design,
the reactor vessel
sits inside the containment,
and then that whole system,
the containment
and the reactor vessel,
sits underwater underground.
And that's the whole
safety system for this plant.
NuScale reactors are small
and modular...
designed to be operated
in clusters,
completely submerged
in a four-million-gallon pool
of water.
Each can generate
about 50 megawatts
of electricity, enough to power
nearly 40,000 homes.
So 12 of them linked together
could service 450,000 homes,
or about as much
as a conventional
nuclear power plant.
As we've gone through
the patent process, some of the
patent examiners have said,
"This is too simple.
How is this possible that this
hasn't been done before?"
Unlike Fukushima,
where critical coolant pumps
had to keep running
for the reactors to cool down,
NuScale has designed a plant
that requires no pumps
and no electricity at all.
So a lot of these
are tied to actual valves.
Okay.
Right now, they are still trying
to validate the concept
and clear the massive
regulatory hurdles.
It will take many years, but
NuScale already has a customer,
the Utah Associated
Municipal Power Systems.
The plant will actually be built
across the state line in Idaho,
at the federal government's
premier
nuclear power test site,
a storied place emerging
from a long nuclear winter.
When I came to Argonne in 1963,
I was then 28, 29 years old.
The world was my oyster.
When Chuck Till first came
to the Argonne National
Laboratory,
it was a great time to be
a nuclear physicist,
a golden era.
A lot of things had been
discovered,
but very many had not.
The things that would be
necessary
for civilian nuclear power to
be a success
basically had not been explored.
And at Argonne you were
right in the center of it.
Argonne's vast testing site
in the Idaho desert
is ground zero
for nuclear power generation.
More than 50 novel reactor
designs have been built
and tested here since 1949.
It is hallowed ground
for nuclear engineers.
The beginnings of nuclear power
were here.
The beginnings of useful
nuclear power were here.
At 1:50 p.m.
on December 20, 1951,
four 200-watt light bulbs
started burning here
with electricity generated
by the Experimental Breeder
Reactor number 1,
the first-ever
nuclear power plant.
Besides the fact that it proved
splitting atoms
could generate power,
it also demonstrated a very
clever way to do it.
The fuel was cooled
with liquid metal...
sodium mixed with potassium,
which has a low melting point.
It absorbs more heat
and has a much higher
boiling point than water.
It meant the reactor did not
need to be encased
in a thick steel pressure vessel
designed to keep water in liquid
form like a pressure cooker.
It was inherently safer,
or so the scientists hoped.
They built this reactor
to test the concept:
Experimental Breeder Reactor
Number Two.
The Experimental Breeder Reactor
Number Two is a reactor
that's known to all nuclear
programs around the world.
It is a full-scale plant
and it proved all kinds
of firsts in nuclear power.
It's now about five minutes
till test time.
It made history
on April 3, 1986.
One minute until the test.
When they staged a bold
demonstration
of how a liquid metal reactor
can handle multiple failures.
Three, two, one, start.
In the turbine hall
was an assemblage of people
They had nuclear programs
and they wanted to see this
because the reactors
don't behave this way.
Reactors can't be relied upon
to shut themselves down.
The first demonstration
foreshadowed Fukushima...
a station blackout
and a loss of coolant flow
to the hot nuclear core.
Mark!
They just shut off the coolant
supply.
And, I mean, to do that
in a normal reactor,
you'd have an explosion.
You could see the power
going straight up.
The next thing, of course, was
everybody's head swiveled back
to where we were, the Argonne
people were, wondering,
"Are they running?"
The demonstration went as hoped.
The power trace went up like
that, came down well below
where it had to come down,
and the reactor just quietly
shut itself down.
Deprived of any cooling,
this reactor did not melt down
or explode.
But how?
Remember, to sustain
a healthy chain reaction,
uranium atoms must be close
enough to each other
so the neutron bullets
can hit their targets.
When the liquid sodium
coolant pumps stop,
the temperature initially rises,
expanding the reactor core,
dispersing the uranium atoms.
As a result, the chain reaction
is reduced,
causing the temperature
to go down.
So the laws of physics
and the robust cooling capacity
of liquid sodium metal
bring it automatically
to a safe shutdown.
At the time
of that dramatic test,
Chuck Till thought this was the
dawn of a new era.
He envisioned widespread
commercial use
of sodium reactors
based on this design.
Absolutely.
The world was going to need
massive amounts of energy
and here was the way.
There was no doubt.
Sodium-cooled reactors,
properly designed, are safer.
I say that without question.
So why don't we have them?
We were stopped.
There has been
a nuclear accident
at the Chernobyl
atomic power plant.
A few weeks after that
demonstration,
a reactor at the Chernobyl
nuclear power plant
in the Soviet Union blew up
during an ill-conceived test.
Chuck Till's success
was totally eclipsed.
This is a model of the Navy's
first nuclear-powered submarine,
the Nautilus.
But the seeds of the demise
for sodium reactors were planted
many years earlier by this man,
Admiral Hyman Rickover,
the father of the nuclear navy.
This is the reactor,
or the atomic pile.
There is uranium in here.
He selected nuclear reactors
cooled with water
to propel the Nautilus, the
first nuclear-powered submarine.
The design made a lot of good
sense for the Navy.
It was the right mix of size,
simplicity, and safety.
Among other things, sodium
explodes when exposed to water.
The huge Pentagon investment
in the research and development
of this technology gave it a big
leg up on other ideas,
including liquid metal reactors.
About the same time,
President Eisenhower delivered
his famous "atoms for peace"
speech at the UN.
So my country's purpose
is to help us move out
of the dark chamber of horrors
into the light.
He hoped to change the way
the world thought
about splitting atoms,
from bombs to light bulbs.
He wanted to export U.S.
nuclear power technology,
and he was in a hurry
to beat the Soviets.
Adapting the nuclear navy
technology for use on land
offered the fastest path
to market.
In 1957, the first commercial
atomic power plant in the U.S.
opened near Pittsburgh, in
Shippingport, Pennsylvania.
Admiral Rickover
personally oversaw
the design and construction.
Very quickly, reactors cooled
with water became the norm.
For 20 years, utilities went on
a nuclear building binge.
But then in the 1970s,
environmentalists took aim
at nuclear power.
The fear of radiation
and the inextricable link
to atomic weapons
and their proliferation
changed the equation.
Protesters viewed nuclear
power as inherently unsafe,
too complex and costly.
And, indeed, as the safety
regulations increased,
so did the cost of building
the plants.
The Achilles' heel of nuclear
power is that you can't protect
against every
conceivable accident.
You can put a lot of extra
safeguards into place
and really lower that
uncertainty as much as you can,
but that will raise the cost
of nuclear power
when it's already unaffordable.
By the mid-'70s, the atomic
energy party was winding down.
And then came the movie.
This is Jack Goddell.
We have a serious condition.
You get everybody
into safety areas
and make sure
that they stay there.
The China Syndrome premiered
on March 16, 1979.
It is the story of an evil
corporation cutting corners,
leading to a nuclear meltdown.
The number of people killed
will depend on which way
the wind is blowing,
render an area the size
of Pennsylvania
permanently uninhabitable,
not to mention the cancer
that would show up later.
Twelve days later,
in Pennsylvania,
life seemed to imitate art
at Three Mile Island,
the seriousness of the meltdown
there unwittingly embellished
by Hollywood.
Support for nuclear power
evaporated.
Still, in the Idaho desert,
Chuck Till's EBR-2 kept going,
running safely for 30 years.
Mr. Speaker, the President
of the United States!
But it was better
at sustaining fission
than political
and popular support.
The program was canceled by
President Clinton in 1994.
We are eliminating programs
that are no longer needed,
such as nuclear power research
and development.
The whole system,
when it was shut down,
was pristine,
30 years of operation.
What a very unfortunate scene.
But now, more than 20 years
later,
the intensive search
for carbon-free power
is prompting a fresh look
at new nuclear technology.
In the face of climate change
reality,
the money is starting to flow
in this direction again.
The federal government
has placed some new bets
on nuclear innovation.
In Idaho, they are taking some
of the old test reactors
out of mothballs.
The fact that we're restarting
that tells us
that we're restarting
a testing infrastructure
to start to develop the next
generation of nuclear power.
Argonne's test site
is now called
the Idaho National Laboratory.
Its director, Mark Peters,
oversees several partnerships
with the private sector
to improve technology,
the state-of-the-art in water
cooled reactors
known as generation three.
But the main goal is to
commercialize generation four.
Generation four are future
reactors that are based
on different concepts,
different core designs,
different coolants.
I'm quite excited about
where we're at today.
And so is his predecessor,
Chuck Till.
It surprises me
when I go on the internet and
see how many allusions there are
to the things that we did.
And I hope that the work
that my colleagues have done
in that decade
from 1984 to 1994 pays off.
The nation has fumbled around,
in my view,
for 20 years unnecessarily.
But now Chuck Till's vision may
finally be gaining
some critical mass.
I'm going to talk today about
energy and climate.
This time one of the drivers
for nuclear power technology
is not an admiral, but rather
a captain... of industry.
And so what we're going to have
to do at a global scale
is create a new system.
Microsoft founder Bill Gates is
among a handful of entrepreneurs
with seemingly bottomless
pockets making big bets
on nuclear power.
At a TED conference in 2010,
he publicly announced
he had co-founded
a company called TerraPower.
Nathan Myhrvold and I
actually are backing a company
that perhaps surprisingly
is actually taking
the nuclear approach.
His partner is his former chief
technology officer at Microsoft,
Nathan Myhrvold.
When we first started investing
in TerraPower
and getting it going,
we had a lot of people come
and look at us, kick the tires.
That was the era when Silicon
Valley was into clean tech.
And they all said, "Oh, my God,
this is risky."
But Bill and I thought
that it being risky
doesn't mean
you shouldn't do it.
In fact, perversely, that's
exactly when you should do it.
It's when everybody else says,
"No, I can't... I can't do it."
It's something that is a risk
that's not for
the faint of heart.
Here they are working
on a 21st-century take
on sodium reactors.
It is designed to run without
reprocessing and refueling.
With the TerraPower reactor,
you fuel it and you don't take
them out for 60 years.
During that period of time,
you'll get enormously more
energy out
than you would get
from the same uranium
if you put it
in a conventional plant.
Unlike water-cooled reactors,
this one does not need the
equivalent of premium gas...
uranium that is refined
to greater potency
in a complex, expensive process
called enrichment.
But the enrichment process
has leftovers.
The biggest stockpile
in the U.S. is here
in Paducah, Kentucky,
at a uranium enrichment plant.
These leftovers,
called depleted uranium,
can be used to fuel
the TerraPower reactor.
If this works, it would be a
game changer for nuclear power,
to store depleted nuclear fuel,
one huge unresolved problem.
With our reactors,
Paducah, Kentucky,
becomes the energy capital
of the United States,
because Paducah alone has enough
of this low-level nuclear waste,
the depleted uranium,
that we could run all of
America's electricity needs
for 750 years.
But TerraPower faces
big regulatory hurdles.
The Nuclear Regulatory
Commission is accustomed
to licensing
water-cooled reactors.
When it comes to innovative
technology like this,
the rules haven't even
been written.
So TerraPower has found
a customer
that is less constrained
by regulation
and public relations: China.
It's where its first plant
will be built.
So far, from a
technical perspective,
we've solved every technical
problem that's occurred.
But I can't tell you, "Oh yes,
we've already been successful."
It's going to be many more years
of hard work
before we are successful.
And stop.
So we made a crazy bet
and we're going to keep making
that crazy bet.
And I'd love to have
more competition.
I'd love to say, "You know,
we're neck and neck"
with three other companies,"
because that's what
moves things forward.
It appears Nathan Myhrvold
will get his wish.
A D.C.-based think tank, Third
Way, conducted a survey in 2015
and found more than 40 startups
across the U.S.
developing advanced
nuclear power designs.
These atomic business plans
have lured
more than a billion dollars
in investment.
I think a lot of it might just
be the changing demographics
of nuclear engineers that
now there are a large number
of young nuclear engineers
who think,
"I have a really good idea.
"I'm going to flesh out this
technology.
"I'm going to raise some
funding.
I'm going to see if I can do
this on my own."
How much do you have to worry
about free fluorine formation?
Leslie Dewan is one of
the young entrepreneurs
leading this revolution.
Yeah, because that's
what I'm hoping.
It's a new generation
with a different outlook.
Atomic power doesn't carry
the same stigma for them.
They are more concerned about
powering the planet
while addressing climate change.
All of this led Leslie to MIT
to study nuclear engineering.
This is a general trend
around the world.
She was a grad student on the
day the tsunami hit Fukushima.
It was especially shocking to me
because when I first
heard the news,
I thought there are overblown
media reports
but I trust that everything
will be okay.
But it went orders of magnitude
beyond what I had thought
the worst-case-scenario accident
was going to be.
And yet she didn't waver
in her goal to build
a new kind
of nuclear power plant.
It made me want to work even
harder on developing
newer types of reactors
that don't have
the same cooling requirements
and that are even more robust
in the case of even more extreme
accident scenarios.
She became enamored with some
nuclear technology
first developed 50 years ago
at another national laboratory,
this one in Oak Ridge,
Tennessee.
It's called
a molten salt reactor.
Not table salt,
liquid fluoride salts.
Unlike the TerraPower reactor
that uses liquid metal
to cool solid uranium fuel,
this inventive design
turns that idea around.
A molten salt reactor
uses liquid fuel
rather than solid fuel.
With liquid fuel,
the size and shape
of the container is crucial.
Pumping the fuel into
a cylindrical vessel
places uranium atoms
close enough to each other
to sustain a nuclear
chain reaction.
If something goes wrong
and it starts to overheat,
the liquid expands
and the uranium atoms become too
dispersed to maintain fission.
So it starts cooling down
passively.
And in the case of a total loss
of station power,
like Fukushima, the design
employs another safety feature.
Below the reactor chamber
is an emergency reservoir.
The drain leading to the
reservoir is plugged
by the same salt mixture,
but it is refrigerated
so that it freezes solid.
Without electricity to keep it
cool, the plug quickly melts,
and the liquid fuel drains
into the emergency reservoir.
Unlike the reactor chamber,
the shape and size
of the emergency reservoir
ensures the uranium atoms
are too far apart
to sustain a chain reaction.
It cools down
and eventually freezes.
Crisis averted.
At Oak Ridge,
they successfully ran and tested
a molten salt reactor
for four years.
The design works.
Even in the worst type
of accident scenario,
even if you don't have any
external electric power
like what happened at Fukushima,
even if you don't have any
operators on site,
they're able
to shut themselves down.
The basic science
is well understood,
but building a reactor that can
withstand something as corrosive
as a very hot bath of salt
is a huge engineering challenge.
It is the focus of early testing
for Leslie's startup company,
Transatomic.
We can make something that works
for five years,
that works for ten years.
Like, that we certainly know.
What we are trying to figure out
now is whether we can use
newer materials or new methods
of corrosion control
to extend the lifetime
of the facility
because ultimately we care about
making this low cost.
If you have to replace your key
components every ten years,
it's not going to be
cheaper than coal.
And if it's not cheaper than
coal, then it's not worth doing.
But coal and all fossil fuels
carry another cost
to the environment.
In Japan, with the nukes
mothballed,
they have kept the lights
burning
by burning imported
fossil fuels,
mostly liquid natural gas.
The result: a steady increase in
greenhouse gas emissions,
reversing the nation's ambitious
reduction plan
signed just two years
before the Fukushima disaster.
If you're concerned
about climate change,
you need to be open
to nuclear power.
I think that there is no way
that the world will meet
its carbon reduction goals
without including nuclear
in the mix.
All over the world,
the demand for energy grows,
exponentially
in emerging economies.
China opens a new coal-fired
power plant about once a week.
Can the world respond to the
relentless demand for energy
without worsening
climate change?
Is it time to rethink
the nuclear option?
The fate of the whole planet
depends on us renewing
our energy system with
renewables and with nuclear.
And if we step back from that,
we are going to create
a tremendous problem
for future generations.
This NOVA program is
available on DVD.
NOVA is also available
for download on iTunes.