"They built the enormous containment structure in just a few months, arguably the greatest feat of civil engineering in history" Slow down Igor have you not seen the B2 stealth bomber that at 172 ft long has a radar signature of a bumblebee, the Us highway system or the Hoover dam, which used so much concrete that it is still curing to this day 83 years later and hot to the touch. While the dome of Chernobyl and the bravery of the Russian clean up workers is admirable, As someone who has seen some of the worlds best feats of engineering and is an actually engineer I think you are getting ahead of your self with that statement.
plus the fact that the "enormous containment structure" had to be rebuilt twice in under twenty five years, speaks to its flawed design and the soviets lack on engineering know how