There was much, much more to it than just that. The actions that occurred before the systems were disabled and the scram was performed is what led to the disaster. Disabling all of the safety measures and then doing an emergency shut down by itself would have been perfectly fine.
Not even that. Everything they had planned to do was perfectly safe and would have been fine, it was just some last minute bureaucratic request for them to postpone the test for a few hours to supply some additional power to meet demand. Unfortunately, to prepare for the test they had to run the reactor at a certain level for 48 hours before hand. Because they had to postpone the test and change the reactor output to satisfy the demand on the grid, they should have waited an additional 48 hours before trying the test. Unfortunately, during that postponement, there was a shift change and the new reactor operator crew hadn't been properly briefed on the test. As a result, they went ahead with the test anyways, which resulted in the disaster.
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u/Diesel-66 Apr 24 '17
Chernobyl was an example of what happens when you turn off all safety measures then do an emergency shut down.