
I'm worried about Sheldon someday
setting off a low-yield NUCLEAR device...
The Big Bang Theory Season 4, Episode 3

...and tried to build
a NUCLEAR reactor in the tool shed.
The Big Bang Theory Season 8, Episode 23

the calculation
of NUCLEAR matrix elements.
The Big Bang Theory Season 7, Episode 20

Luckily for you,
this is not a NUCLEAR reactor.
The Big Bang Theory Season 1, Episode 16

is a NUCLEAR warhead.
Money Heist Season 1, Episode 9