[cartoonworld]

This is why they are so risk averse, there indeed are incredible dangers and if varies per place.

Operators, manufacturers and service have spent a long time making what we have very reliable in what are now pretty old designs. If a new pump manufacturer appeared in the scene, everyone making decisions needs to assess the reliability vs a well-known quantity of reliability.

This is what I mean when I say risk averse, and the mortar in the bricks are the suppliers and services. The record doesn’t show worse and worse throughout time, everyone in a nuclear safety related industry knows what to expect and what is expected of their production. Changing even this linear no-threshold model would incur a LOT of engineering, process development/improvement and risk analysis, which none of them want to do.

If you’re the one that screws up, it can be a nasty stain.