Comment by ParrotyError

A containment vessel at Chernobyl would have been useless. The Chernobyl disaster was a combination of poor reactor design leading to dangerous reactor physics, poor safety systems, poorly-trained staff, and an dangerous and unnecessary "experiment" being performed on the reactor (i.e. operating it in a dangerous regime). No containment building could have been strong enough to contain the explosion. The RBMK is a particularly bad design of reactor.