There are pretty good regulations around what could be radioactive or contaminated in relation to a reactor core. Mother's milk is certainly not mentioned.

I'm writing Hacker News comments. I don't care to specify with verbose and overly anal details exactly what is included and excluded in such statements. Luckily, scientists and regulators don't agree with your opinion how ridiculous the risks are. If stuff comes close to a reactor, it has to be tested for contamination. And overall, there is a lot more waste which needs special disposal, than just the fuel.