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April 18, 2024

Nuclear Energy in a Climate Change Context: Current
Appropriations for Nuclear Energy Development

The potential role of nuclear energy in mitigating climate
change has been a significant element of recent
congressional discussions about energy and environmental
policy. For example, Senate Environment and Public Works
Committee Chairman Tom Carper at a committee hearing
in April 2023 stated, As many of you know, I believe that
safe nuclear power plays an essential role in our efforts to
address the greatest challenge of our time, the climate
crisis. Other Members of Congress have expressed
opposition to nuclear power over concerns that include
safety, cost, and the risk of storage of spent nuclear fuel.
The Consolidated Appropriations Act, 2024 (P.L. 118-42)
includes more than $5 billion in new funding and transfers
for advanced reactors and fuel, as well as support for
existing civilian nuclear power. Nuclear energy is also
included as a consideration in the Biden Administration's
Long-Term Strategy for the United States on climate
change.
U.S. C mate Strategy
Human-caused emissions increase the levels of greenhouse
gases (GHGs) in the atmosphere, causing global average
temperature increases, with a corresponding increase in the
net negative effects of climate change. Average global
temperatures have increased by approximately 1.00 C since
the preindustrial period, with corresponding identified
climate-driven impacts.
A scientific consensus exists that reducing net global GHG
emissions to zero (net zero) by 2050 is consistent with a
greater than 50% chance of limiting global temperature
increases to 1.50 C. The Long-Term Strategy includes a
goal of reducing U.S. GHG emissions to net zero by 2050,
as a contribution to limiting climate-driven impacts.
As a party to the United Nations Framework Convention on
Climate Change (UNFCCC), the United States submitted a
Nationally Determined Contribution (NDC) document with
the goal of reducing U.S. GHG emissions by 50%-52% by
2030 compared with 2005. All pathways described in the
Long-Term Strategy that achieve net-zero U.S. GHG
emissions by 2050 incorporate achieving the 2030 U.S.
NDC GHG emissions reduction goal.
Many factors contribute to the U.S. emission of GHGs. The
pace of U.S. GHG emissions reduction has not occurred,
and is not currently projected to occur, at a rate that some
experts assess is in line with meeting these stated climate
goals. Emissions reductions in industrial processes,
transportation, and other sectors have proven challenging.
Replacement of certain fossil fuels with low-carbon

electrification and alternative energy sources has been seen
as a mechanism for GHG emissions reduction.
Rising U.S. electricity demand could pose additional
challenges. The electricity sector has raised the concern that
projected increases in electricity demand, including those of
data centers, and the potential effects of a transition to
lower carbon electricity generation could affect electric grid
reliability.
Potentia Ro e of Nu dear Power
The Long-Term Strategy includes several technological
transformations considered key to achieving the strategy's
climate goals. These include decarbonizing electricity
generation, fuel switching in other sectors to electricity and
carbon-free fuels such as hydrogen, cutting energy waste,
reducing methane and other non-carbon dioxide (C02)
emissions, and scaling up CO2 removal.
Supporters of nuclear energy contend that nuclear energy
could contribute to bringing the United States onto a
decarbonization trajectory consistent with its 2050 net-zero
GHG emissions goal. Proponents say this could be
accomplished, for example, by increasing nuclear-generated
electricity and using nuclear reactor heat for industrial
processes, such as the production of hydrogen, replacing
equivalent energy from fossil fuels.
Increasing the role of nuclear power would likely involve
building new nuclear generating capacity both to replace
existing, aging nuclear reactors and to create a net increase
in nuclear generating capacity. Some nuclear power
advocates state that such efforts would be facilitated by
* using standardized reactor designs, such as small
modular reactors (SMRs), that could be built in series to
achieve construction economies of scale;
* increasing the capability and capacity of the nuclear
workforce and supply chains;
* developing advanced reactors that could be smaller,
safer, and less expensive than existing nuclear
technology; and
* using nuclear fuel developed for enhanced safety and
requiring less frequent reactor refueling.
Some environmental advocates have questioned the use of
nuclear energy to contribute to mitigating climate change.
Such groups raise concerns about nuclear energy that
include cost, timing, safety, whether nuclear power's life-

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