There were so many things that went wrong at Chernobyl that it's not entirely clear whether "proper training" would have helped or not. It's true that the a delay in the test that resulted in the disaster meant that it was being performed by the night shift instead of by the day shift who had been prepared in advance for the reactor shutdown and testing.

However, many people who had had sufficient training to know better made bad decisions that cumulatively led to this situation, and there were some problems with the reactor design itself that certainly at least contributed to the disaster.

A hazard becomes a disaster when the hazard becomes spread out over a large area. For example, the Chernobyl disaster started as a small hazard which became something that could not be controled. Eventually the plant exploded and created the worst nuclear disaster in history. The land will not be habitable for centuries.

i dont know try some where else

with a sweeping brush