You're right. But if it was internationally implemented there is always a chance that a natural disaster can cause trouble.
Remember Fukishima?
Not every Nuclear Power Station is going to built on a Fault-line. Just saying.
Yes. However nature is unpredictable. You never know when a flood, tsunami, hurricane, volcanic eruption, storm, etc. can happen so the risk is always there.
They are built to withstand things like that...
Floods can be "diverted" build a nuclear power plant on high ground.
Tsunami in Australia are unlikely and we can build power plants further inland
Hurricanes only occur in the northern hemisphere we only have to worry about cyclones and those only occur in the summer and they're just glorified storms. The walls of a nuclear power plant are made to withstand direct impact from things larger than jets I'm sure it could withstand a strong breeze from a cyclone.
Volcanic eruptions are ever so slightly worse than nuclear power plants going critical.
We don't just build this shit out of the same flimsy materials we build houses out of they're DESIGNED to withstand the things you listed above.
Fukushima is one disaster and was the result of dishonesty, lack of responsibility and just general disregard for proper safety and building regulations.
There will always be a risk when dealing with nuclear energy but that risk is mostly human error.