alt Hacker NewsNuclear reactors are regularly maintained, tested and checked. When possible, old plants are upgraded to new safety standards.
You can upgrade certain components, and safety systems. However things like the containment structure or pressure vessel can't be changed. You for example can't retrofit a core catcher, but you could improve the turbines, I think Steam Generators as well, replace PLC's, Tsunami proof your site by building a larger tsunami wall / making your backup generators flood proof...
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Right, and ultimately Japan has decided the safest and I assume cheapest route with these reactors wasn't to rebuild but rather to decommission.
These reactors can be made safer, but they all still have a foundational design flaw which means the ultimate goal should be replacing rather than continually spending money reinforcing.
... and add a pipe to vent the hydrogen gases outside instead of accumulating it inside the reactor building!
Those old reactors in Belgium have already had several issues.
Belgium's reactors are really old, and have lots of issues. They have been dragging their feet for decades on the subject and instead of building new reactors 10-20 years ago, they are now un-decomissioning older reactors..