-
Have you ever been in an argument
about nuclear power?
-
We have, and we found it
frustrating and confusing,
-
so let’s try and get to grips
with this topic.
-
It all started in the 1940s.
-
After the shock and horror of the war
and the use of the atomic bomb,
-
nuclear energy promised to be a peaceful
spin-off of the new technology,
-
helping the world get back on its feet.
-
Everyone’s imagination was running wild.
-
Would electricity become free?
-
Could nuclear power help
settle the Antarctic?
-
Would there be nuclear-powered cars,
planes, or houses?
-
It seemed that this was just a few
years of hard work away.
-
One thing was certain: the future
was atomic.
-
Just a few years later, there was a sort
of atomic age hangover;
-
as it turned out, nuclear power was very
complicated and very expensive.
-
Turning physics into engineering
was easy on paper,
-
but hard in real life.
-
Also, private companies thought that
nuclear power was much too risky
-
as an investment; most of them would much
rather stick with gas, coal, and oil.
-
But there were many people who
didn’t just want to abandon
-
the promise of the atomic age;
an exciting new technology,
-
the prospect of enormously
cheap electricity,
-
the prospect of being independent
of oil and gas imports,
-
and, in some cases, a secret desire to
possess atomic weapons
-
provided a strong motivation
to keep going.
-
Nuclear power’s finest hour finally came
in the early 1970s, when
-
war in the Middle East caused oil prices
to skyrocket worldwide.
-
Now, commercial interest and investment
picked up at a dazzling pace.
-
More than half of all the nuclear reactors
in the world were built
-
between 1970 and 1985.
-
But which type of reactor to build,
given how many different types
-
there were to choose from?
-
A surprising underdog candidate
won the day:
-
the light water reactor.
-
It wasn’t very innovative, and it wasn’t
too popular with scientists,
-
but it had some decisive advantages:
-
it was there, it worked, and it wasn’t
terribly expensive.
-
So, what does a light water reactor do?
-
Well, the basic principle is shockingly
simple:
-
it heats up water using an artificial
chain reaction.
-
Nuclear fission releases several million
times more energy
-
than any chemical reaction could.
-
Really heavy elements on the brink of
stability, like uranium-235,
-
get bombarded with neutrons.
-
The neutron is absorbed, but the result
is unstable.
-
Most of the time, it immediately splits
into fast-moving lighter elements,
-
some additional free neutrons, and
energy in the form of radiation.
-
The radiation heats the surrounding water,
while the neutrons repeat the process
-
with other atoms, releasing more
neutrons and radiation
-
in a closely controlled chain reaction,
very different from the fast, destructive
-
runaway reaction in an atomic bomb.
-
In our light water reactor, a moderator
is needed to control the neutrons’ energy.
-
Simple, ordinary water does the job, which
is very practical, since water’s used
-
to drive the turbines anyway.
-
The light water reactor became prevalent
because it’s simple and cheap.
-
However, it’s neither the safest, most
efficient, nor technically elegant
-
nuclear reactor.
-
The renewed nuclear hype lasted barely
a decade, though;
-
in 1979, the Three Mile Island nuclear
plant in Pennsylvania
-
barely escaped a catastrophe when
its core melted.
-
In 1986, the Chernobyl catastrophe
directly threatened Central Europe
-
with a radioactive cloud, and in 2011
the drawn-out Fukushima disaster
-
sparked new discussions and concerns.
-
While in the 1980s 218 new nuclear power
reactors went live,
-
their number and nuclear’s global share of
electricity production has stagnated
-
since the end of the ’80s.
-
So what’s the situation today?
-
Today, nuclear energy meets around 10% of
the world’s energy demand.
-
There are about 439 nuclear reactors
in 31 countries.
-
About 70 new reactors are under
construction in 2015,
-
most of them in countries
which are growing quickly.
-
All in all, 116 new reactors are
planned worldwide.
-
Most nuclear reactors were built more than
25 years ago with pretty old technology.
-
More than 80% are various types of
light water reactor.
-
Today, many countries are faced with
a choice: the expensive replacement of
-
the aging reactors, possibly with more
efficient, but less tested models,
-
or a move away from nuclear power towards
newer or older technology
-
with different cost and environmental
impacts.
-
So, should we use nuclear energy?
-
The pro and contra arguments will be
presented here next week.
-
Subscribe, and then you won’t miss it!
-
Our channel has a new sponsor:
Audible.com.
-
If you use the URL
,
-
you can get a free audiobook and
support our channel.
-
Producing our videos takes a lot of time,
and we fill a lot of it by listening
-
to audiobooks.
-
For a really entertaining book,
we recommend
-
“Into Thin Air” by Jon Krakauer.
-
He’s a great writer, and the story is
really absorbing and true.
-
Go to to get
the book for free.
-
Thanks a lot to Audible for supporting our
channel and to you for watching!