Small modular reactors with outputs in the
double- to triple-digit megawatt range increasingly
are being eyed as a way to drive down the costs,
speed deployment and give a boost to nuclear as an
energy source going forward.
About a half-dozen companies are trying to
commercialize early-stage ideals and models spawned
primarily in academic and government labs. These
efforts are being driven by U.S. Department of
Energy funding, which recently has backed two of
these efforts. For this work to support the
development of one or two U.S. light-water reactor
designs, the department allocated about $452 million
to be spent over five years.
Although small reactors have been used for decades
to power nuclear submarines and to produce neutrons
for medical and research activities, the envisioned
modern small reactors for power generation are
different altogether.
The concept is simple. Develop modular reactors with
a standardized, approved and certified design. And
then make deployment of these reactors less
expensive by reducing siting costs and by reaping
economies of scale via mass production.
Basic research into such small reactors has been
going on for years at DOE-funded labs. Work has now
progressed from the lab to address the practical
matters to get the units into operation. This is
reflected in DOE's funding of the field over the
last several years.
Last December, the DOE announced an award to NuScale
Power to support a new project to design, certify
and help commercialize innovative small modular
reactors in the United States. When the award was
announced, Energy Secretary Ernest Moniz noted the
importance of the work in this field, saying, "Small
modular reactors represent a new generation of safe,
reliable, low-carbon nuclear energy technology and
provide a strong opportunity for America to lead
this emerging global industry."
The NuScale Power Module reactor is a small,
scalable, pressurized water reactor that uses
natural forces to operate and cool the plant. Each
NuScale Power Module has a 160-megawatt thermal
output and can generate 45 megawatts of electrical
power.
Through a five-year cost-share agreement, the DOE
will invest up to half of the total project cost,
with the project's industry partners matching this
investment. The funding for this work comes from the
department's Small Modular Reactor Licensing
Technical Support program.
The ultimate aim of this funded work is to help
NuScale obtain Nuclear Regulatory Commission design
certification and licensing, and achieve commercial
operation around 2025. The DOE's cooperative
agreements require that the reactors be built
domestically.
Previously, in November 2012, the department awarded
support to a project led by Babcock & Wilcox in
partnership with the Tennessee Valley Authority and
Bechtel. This five-year cost share agreement
was a first-of-a-kind engineering, design
certification and licensing for small modular
reactors in the United States. The award was
given to develop the company's small modular reactor
system, which is a scalable, modular, advanced
light-water reactor in which the nuclear core and
steam generators are contained in a single vessel.
The Babcock & Wilcox Generation III++ small modular
reactor mPower system is designed to generate 180
megawatts of electricity.
These funding choices have directly or indirectly
caused some changes in the market. In February,
Westinghouse opted to scale back work on its
225-megawatt small modular reactor, saying it was
reassessing its design certification application
schedule. Also in February, TerraPower, a company
backed by Bill Gates and others to develop a
scalable, sustainable, emission-free and
cost-competitive energy source, entered into an
agreement with Babcock & Wilcox. That work will
support the joint development of TerraPower's
Generation IV traveling wave reactor.
Outside the United States, work in this arena is
accelerating. In China, Chinergy has started work on
a demonstration high-temperature pebble bed modular
nuclear reactor project. The system will be a
gas-cooled reactor with twin reactor modules of 100
megawatts, each driving a single 200-megawatt steam
turbine. The goal is to start generating commercial
electricity by the end of 2017.
In Europe, Urenco, a company that enriches uranium
for use in nuclear power plants, has proposed the
development of 5-to-10-megawatt, plug-and-play,
inherently safe reactors. It is seeking government
support for a prototype uranium-fueled battery that
would run for five to 10 years before requiring
refueling or servicing.
In addition to these efforts, there are other small
modular reactor projects in various stages of
development in Russia, Canada and India.
In other parts of the world, such as throughout
Africa, organizations are considering small modular
reactors as a way to generate electricity. Such
reactors are seen as a way to meet exploding
electricity demands in regions that have until now
been without generation or distribution capacity.
The small modular reactors would be able to meet
localized power requirements.
Clearly, there is no one design or technology that
is a clear favorite to be successful. The promising
designs in development through all of these efforts
will need to address engineering, costs and
licensing challenges before small modular reactors
can go into commercial production.
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Published In:
EnergyBiz Magazine May/June 2014
http://www.energybiz.com/article/14/06/promise-modular-reactors