Common commercial-grade, land-based, civilian nuclear reactors the size of large buildings are dime a dozen.
The miniature military-grade
marine nuclear reactors specifically designed to power aircraft carriers, destroyers, and submarines are the crown jewels that China can only dreams of manufacturing.
They've been experimenting with crude nuclear-powered submarines using civilian nuclear tech for over two decades now, and those prototypes are an
unending source for amusement in the military circle, because they're even worse than Cold War era diesel subs.
The Liaoning Chinese carrier is also currently running on six gigantic diesel generators, not because the crew enjoy choking on the exhaust.
Now, imagine a company famous for designing and building nuclear reactors for the
Nimitz-class supercarriers sudden becomes Chinese.
Behind the scene, the U.S government is scrambling to find an American company (or one from an Allied nation) to take Westinghouse off Toshiba's hand before the fire-sale begins, that much I'm sure.