Question

Nuclear power generation provides a large percentage of the energy requirements in the U.S.

True
False

Answer 1

I don't know but does this help?

The country's 100 nuclear reactors produced 798 billion kWh in 2014, over 19% of total electrical output. There are now 99 units operable (98.7 GWe) and five under construction.

http://www.world-nuclear.org/info/Country-Profiles/Countries-T-Z/USA--Nuclear-Power/

Answer 2

Kind of depends on what you mean by "large percentage", doesn't it?
From the US Energy Information Administration website:

What is U.S. electricity generation by energy source?

In 2014, the United States generated about 4,093 billion kilowatthours of electricity.1 About 67% of the electricity generated was from fossil fuels (coal, natural gas, and petroleum).

Major energy sources and percent share of total U.S. electricity generation in 2014:

Coal = 39%
Natural gas = 27%
Nuclear = 19%
Hydropower = 6%
Other renewables = 7%
Biomass = 1.7%
Geothermal = 0.4%
Solar = 0.4%
Wind = 4.4%
Petroleum = 1%
Other gases < 1%