I’ve watched this video myself. There are several topics that all go fairly in-depth. Summarizing the video would be a non-trivial amount of effort and would likely diminish the point the author is trying to make, because it would lose the depth and nuance of the original.
I’m also struggling to understand the animosity towards a video being posted. Is it YouTube specifically, or the fact that it’s a long-form video? Video media has been a communication standard for decades. There are FOSS frontends for YouTube that could alternatively be used if you wish to stay away from Google’s ecosystem.
Tl;dr: I don’t think it’s reasonable to ask OP to summarize a 40 minute video that would greatly water down the original content.
There are several factors to consider when choosing materials in a nuclear plant. For things that aren’t in direct proximity to the reactor core, neutron activation (becoming radioactive) is less of a concern. Aluminum produces hydrogen gas when exposed to boric acid, which presents an explosion risk. Certain chemical compounds can cause corrosion to plant equipment, even a Sharpie marker could corrode a valve or pipe and cause issues over the 50 year life span of a plant.