That was essentially a demonstration plant. Note that it only ran for six years, only produced 1,926 kg of plutonium over its entire lifespan, and was shut down because producing plutonium from spent fuel from commercial power reactors proved to be uneconomic.
2000 kg of plutonium is a rounding error, given that well over 1 million kg of plutonium have been produced since WWII.
The US has almost 7,000.
The US has never used commercial power reactors to produce plutonium, because they simply aren't well-suited for the purpose.