It’s a small island with a significant civilian population. That’s not the right place to leave nuclear waste. As for security, there might have been a couple of 19-year-olds leaning on an M16 somewhere, but it looked deserted to me.
This isn’t just mine tailings or industrial filth we’re talking about. Of all the countries currently using civilian nuclear power, virtually none of them have anything other than stopgap measures for storage, with the expectation that some future government will cough up the cash to actually bury the waste securely enough to survive intact on geological timescales. Would you seriously trust Taiwan’s culture to deliver anything better than the current best practice, which (as far as I can tell) is the USA? They have trouble understanding that motor vehicles are dangerous, and you can’t even see radiation.
The report I linked to was measuring very low levels, but they were steadily increasing, and they were isotopes which could have only originated from a fission process. That suggests a leak. The alternative explanation is that they’re washing in from elsewhere, but that could be confirmed by taking tests at different places in the surrounding sea. Anyone heard of Taipower doing such a thing to prove conclusively that there is no leak?
Out of sight, out of mind is not the same thing as “safe”. You’ve been living in Taiwan too long