Sponsored by SurfShark VPN. Click on the link in the description and enter
promo code UNDECIDED for 84% off and 4 extra months for FREE! With the growing popularity of solar and wind,
we sometimes forget another powerful low-carbon energy source: nuclear. It can be a divisive topic, but there's a
really interesting alternative to building out massive, expensive nuclear plants that's
worth talking about: Small Modular Reactors. What are they? What are the benefits? And do they really address the downsides of
nuclear energy? I'm Matt Ferrell. Welcome to Undecided. When the word nuclear comes up, most people
think of mushroom clouds, wars, and disasters. But, even though there is a scary history
behind nuclear energy, many consider it essential for establishing a reliable carbon-free energy
supply. We've been producing nuclear energy since
the first nuclear power plant was connected to the Soviet power grid in 1954 . It's widely
considered to be a stable, carbon-friendly energy source that can be used to support
the intermittency of renewables such as wind and solar. Some countries, like France (71.7%), Slovakia
(55%), Ukraine (53%), and Hungary (50.6%) rely on nuclear to produce electricity. And it accounted for 10.3% of the world’s
electricity generation in 2019. However, that number was higher in the past. In 1996, nuclear accounted for 17.7% of the
global power generation . Only a net of 2.4 GW of new nuclear generation capacity came
online in 2019, compared to 98 GW of solar PV and 59.2 GW of wind. What's caused that sizable decrease? And why aren't we building out more nuclear? The major events of Three Mile Island, Chernobyl,
and the more recently Fukushima certainly made people fear nuclear energy and stalled
the industry’s growth. But, the safety threat and nuclear waste aren't
the only causes of nuclear energy being left out in the cold by governments and investors. The intermittency of renewables needs to be
supported by fast and responsive energy production. Nuclear power plants could be a stable and
low-carbon solution for this problem, but they're complex, expensive, and usually take
about 6 years to build ... and some have some significant delays during construction . The
time it takes varies project to project, but one report gave a cost estimate for a new
US nuclear power plant of $5,945/kW . On the other hand, the average cost of natural gas
generators installed in 2018 was $837/kW, and the construction of those come in around
two years , . So you can see why natural gas power plants are more appealing to a utility,
even though they're not as carbon-friendly as nuclear. According to the World Nuclear Industry Status
Report 2020, the Levelized Cost of Energy (LCOE) from nuclear power rose from around
$117/MWh in 2015 to $155 by 2019. In comparison the LCOE of solar and wind reached
$40/MWh and $41/MWh, respectively. The report stated: “What is remarkable about
these trends, is that the costs of renewables continue to fall due to incremental manufacturing
and installation improvements while nuclear, despite over half a century of industrial
experience, continues to see costs rising,” . The nuclear industry needs an escape route
... something to make it more financially attractive, reduce construction time, but
still comply with all the numerous safety standards that are needed. That escape route has been to invest in new
reactor technology. I have another video about Thorium Reactors
on my channel, showing its advantages and challenges, but the other trend I've seen
in my research, and the comments from a lot of you, has been around Small Modular Reactors
(SMRs). It promises to reduce construction cost and
time, as well as improve safety. Many people believe they can be the future
of nuclear power, but what is it exactly? Compared to "regular" sized reactors that
are really big, Small Modular Reactors have a much smaller footprint, which means that
they can be built more quickly and safely in factories, and then shipped to the installation
site. But how small is "small? Well, they're small enough to fit in trucks
and shipping containers. Compared to conventional large-scale nuclear
reactors that have to be built on-site and have unique designs, SMRs can be manufactured
in factories with standardized designs. This means you can scale production, reduce
costs, and lower the risk of delays in the construction of nuclear power plants. The World Nuclear Association defines SMRs
as nuclear reactors generally 300 MW equivalent or less, designed with modularity in mind. To round off the SMR terminology, there are
also units called "very small modular reactors," or VSMRs, of up to 15 MW . Compared to the
world’s largest reactor that have topped 1.6 GW of power capacity, this new technology
is pretty small, isn’t it ? NuScale Power, one of the front-runners in SMR development
has designed a small modular reactor (SMR) that would take up 1% of the space of a conventional
reactor. Whereas a typical commercial reactor cranks
out a gigawatt of power, each NuScale SMR would generate just 60 MW. The in-factory fabrication feature of SMRs
can significantly reduce on-site preparation and construction cost, as well as make it
possible to set them in remote locations that wouldn't normally be possible with a larger
power plant. Also, SMRs can be linked with other energy
sources, including renewables and fossil fuels, to increase grid stability and security . Talking about money, for about $3 billion,
NuScale would install multiple 12 MW SMRs to build a 720 MW nuclear power plant. That's about 20% cheaper per-megawatt than
the $14 billion quoted for two traditional 1.25GW units currently being installed near
Waynesboro, Georgia. And that construction has been hit by delays
and a ballooning cost up to $28 billion. What about safety? Nuclear power plants are complex buildings
that rely on external power systems such as AC power, backup generators, and batteries
to cool down the reactor’s fuel in the case of a power loss, which increases accident
risks. Suppose something that wasn't considered in
the design happens. In that case, it may cause the system to fail,
similar to what happened in the Fukushima Daiichi nuclear disaster in 2011 when a second
tsunami that wasn't expected hit the nuclear plant. On top of that, maintenance and refueling
are an additional complexity for nuclear power plants. Every 18 to 24 months, these power plants
are shut down for refueling, which usually takes a month without energy production, and
SMRs can be a promising candidate to reduce these downsides. When we talk about nuclear reactors, we refer
to a containment building with large walls, safety measures, and cooling. But, with SMRs, it's different. These small-sized reactors fit right into
other structures or come with their own containment structure. And some of these designs have a long refueling
cycle. For example, the 5 MW Micro Modular Reactor,
from Ultra Safe Nuclear Corporation (USNC) ... you gotta love that name ... requires
no refueling in its 20-year operating lifetime, and the 100 MW ARC-100 small modular reactor
would have a refueling cycle of a similar 20 years. SMRs enhance safety and security through lower
thermal power of the reactor core and use of passive safety systems. That means they have less reliance on active
safety systems like additional pumps and AC grid power, generators, and batteries. NuScale’s SMR employs natural water circulation
to passively cool its reactor down. The thermal safety system incorporates an
on-site water reservoir located on the sides of the outer vessel, which removes the heat
from the core, avoiding a complete meltdown. In an eventual emergency, specialized valves
open automatically, which allows steam to be released from the reactor vessel into the
containment vessel. The steam then condenses, and water flows
back down into the core through the second set of valves at the bottom of the reactor
vessel. This helps cool the reactor down. The steam generated by boiling water recirculates,
setting up a passive safety cooling process that lasts until the heat and pressure finally
stabilizes. All this cooling and power control happens
with no external interference, no AC or DC power, no operator, and no additional water,
similar to proposed molten-salt thorium reactors. Considering all these advantages, many countries
have been investing a lot of money in research and development of SMRs. The Oregon-based NuScale, for example, has
spent more than $800 million on its SMR design . In 2010, the company estimated a capital
cost for a 12-module, 540 MW NuScale plant would be about $4,000/kW, which rose to $5,078/kW
net in 2014 and an LCOE presumed to be about $100/MWh for the first unit. In June 2018, the company declared that its
reactor could produce 20% more power than originally planned. Subject to Nuclear Regulatory Commission approval,
this would lower the overall capital cost to about $4,200/kW and lower the LCOE by 18%
. Other American SMR developers include GE Hitachi Nuclear Energy, Bill Gates-backed
TerraPower, X-Energy, and Hyperion Power Generation. China National Nuclear Corporation (CNNC)
announced in 2019 it would start building a demonstration of its 125 MW ACP100 small
modular reactor on the north-west side of the existing Changjiang Nuclear Power Plant
by the end of the year. Canadian ARC Nuclear is also developing an
exportable, factory-produced, 100 MW sodium coolant nuclear reactor with fuel costs fixed
for more than 20 years. They also have a company called Terrestrial
Energy that's been developing and integrating components from two existing designs; the
Denatured Molten Salt Reactor (DMSR) and Small Modular Advanced High Temperature Reactor
(smAHRT) ... yeah, smart . Russia is also dabbling in this area. The nuclear engineering company OKBM Afrikantov
launched the first floating nuclear power plant. Akademik Lomonosov, is a power barge that
employs 2 35MW SMRs. It started operation in December 2019 in its
permanent location in the Chukotka district, and by May 2020 was fully commissioned and
had delivered 47.3GWh of energy, covering 20% of demand in the region , . But, is this all to good to be true? But before I get to that, I’d like to thank
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supporting the channel. So are SMRs too good to be true? Although progress has been made in SMR technology,
licensing and certification are a major stumbling block for SMRs, as well as potential design
changes and increased security. NuScale design, for example, is still in the
licensing stage and faces important security questions, which include potential problems
with the system that automatically shuts down its reactors in eventual emergencies . Normally,
convection circulates water laced with boron to control the nuclear reaction through the
core of NuScale’s reactor. As I mentioned earlier, if the reactor overheats,
it shuts down and valves release steam into the containment vessel, where it condenses
and flows back into the core. However, the condensed water can be low in
boron, and reviewers are concerned that low boron level might mean it wouldn't be able
to stop the core. This has complicated their approval process
. In addition to that, even though SMRs can
be cheaper and safer, they still have to contend with economies of scale. Conventional power plants have thousands of
Megawatts of power production capacity compared to dozens or hundreds of Megawatts for SMRs. An analysis performed by Energy Strategies
for the Healthy Environment Alliance of Utah in 2019 showed an SMR LCOE range of $46.66/MWh
to $90.48/MWh, and that's with a lot of uncertainty around resource costs. Nuclear power's biggest rival, natural gas,
had an LCOE of $45.56/MWh . Another issue that's pointed out by critics
of nuclear power is the unresolved problem of what to do with long-lived radioactive
waste. SMRs that use a pressurized water reactor
will still generate highly radioactive fuel, and no country has proposed a permanent solution
for how to safely store this type of waste , . Dr. Gordon Edwards, The president of the
Canadian Coalition for Nuclear Responsibility (CCNR) wrote: “Radioactive left-over used fuel from the
new (SMR) reactors will still require safe storage for hundreds of thousands of years.” -Gordon Edwards, president of the Canadian
Coalition for Nuclear Responsibility (CCNR) The International Atomic Energy Agency has
also written about this topic. > “Solutions for managing spent fuel and
radioactive waste arising from SMRs will be one of the most important factors to take
into account when choosing a technology, along with the security of fuel supply.” -Christophe Xerri, IAEA Director of Nuclear
Fuel Cycle and Waste Technology Despite the challenges, SMR supporters look
at it as a potential solution for nuclear power to be more cost-effective, safe, and
competitive against other fast response power sources to balance an increasingly intermittent
power supply that comes from wind and solar power. They may be right; but there are still concerns
about SMR technology that need to be addressed, and unresolved problems with nuclear power
in general that need solutions before this carbon-free power source can be considered
a viable, worldwide option. Jump into the comments and let me know what
you think. And if there's anything I missed with SMRs. If you liked this video be sure to check out
one of the ones I have linked right here. Be sure to subscribe and hit the notification
bell if you think I’ve earned it. And as always, thanks so much for watching,
I’ll see you in the next one.
