NNSA may refer to
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National Nuclear Safety Administration
National Nuclear Safety Administration () or NNSA is a central government agency responsible for regulating nuclear safety, supervision on all civilian nuclear infrastructure in China. It also inspects nuclear safety activities and regulate the ...
, People's Republic of China
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National Nuclear Security Administration
The National Nuclear Security Administration (NNSA) is a United States federal agency responsible for safeguarding national security through the military application of nuclear science. NNSA maintains and enhances the safety, security, and e ...
, United States of America
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