I am under no illusions that these plants have an infinite lifetime. I know enough about embrittlement and displacement damage to know that you aren't going to run a decent-sized LWR, even with a low-leakage core, much beyond about 80 years. So if you can keep the failure rate low enough that you can manage that kind of timeline with essentially zero chance of a catastrophic failure, you're probably in a good position to make it.
BTW, one of my jobs as a consultant was to design a nuclear plant with essentially all replaceable components, including the pressure vessel. Looked great on paper. I tried to sell it to Circle Bar W but they didn't go for it, they were into IRIS at the time. Maybe I should dig those plans up...
The way things are going now you should live so long as to get a chance to implement the plans.
After this there is going to be another long dry spell on reactor construction I’m afraid. You and that industry are sharing the same gifts from the environmentalists my industry is ‘cept we have obastard after us now as well.