@AnungIkwe >A major reason for the disaster was that those in Moscow who decided to re-purpose reactors originally designed to produce materials for nuclear weapons to produce electricity kept secret a good deal about the inherent design dangers and instability of the reactors even from the reactor operators (including its “positive void co-efficient of reactivity”). The operators with pressure to fill production quotas cut corners.
And you know they were told to go over the allowable limits to impress the higher ups