This deep, down-the-rabbit-hole read was right up my alley!
"A Technical History" was not an easy read, and certainly parts of the chapters specific to physics and chemistry research flew over my head, but the majority of this book was readable (if determined!), fascinating, and even funny and entertaining with some of the on-page footnotes (many anonymous employee anecdotes and stories that were too good not to include in the "technical" history).
I suspect many Canadians outside of Ontario and particularly under-40's across Canada don't know much about AECL and Canada's nuclear history. Not just the maybe-recognizable CANDU reactor name, but the fundamental research programs at AECL that enabled CANDU, modern isotopic medicine, food irradiation, and more. After crushing a pretty deep backlog of energy and nuclear books so far, I only had the foggiest awareness of CANDU and basically no idea what role AECL played in history. This book filled in a LOT of blanks and gave me a deep appreciation and even pride for Canada's nuclear legacy! It's amazing that a small (by population) country built a world-class nuclear energy program from scratch - all for peaceful purposes.
Main CANDU takeaway: neutron economy, neutron economy, neutron economy.
As a space geek one of my favourite anecdotes is how CANDU nuclear reactor reliability and uptime requirements drove innovation in valve packing (a type of seal that keeps big valves from leaking via the stem, i.e. the shaft that's manually or mechanically actuated to open/close the valve). Industry-leading valve packing lasted ~1 year at best before AECL researchers 5x'd the life. Following the O-ring failures on space shuttle Challenger, researchers from Chalk River labs collaborated with NASA on the shuttle fix, and a couple Chalk River researchers were invited to watch the first post-accident launch.
I am fortunate that an engineer currently working for Atomic Energy of Canada Ltd recommended this book to me! This seems like a "lost" book - just 2 ratings and 1 review on Goodreads (before me) - but it's an absolute treasure.
I'd recommend this book to people who tick a few boxes of: history buff (Canada sci/tech, organizational, or technical), nuke-bro (or CANDUde/DUdette), engineer/technologist, and/or has read enough on nuclear to not be intimated by this gargantuan tome.