This is a large topic. Let's narrow it down to nuclear power stations. A nuclear power station is a complicated thing, so there's many things that could go wrong.
To take an example, there may be a problem with the cooling system, causing the increased temperature in some part of the reactor. Naturally there are safety systems in reactors, so a "disaster" would only really occur in the event of multiple system failures or perhaps erroneous human intervention. The cooling system in a reactor utilises water, which turns to steam when given enough energy. A continued increase in temperature can lead to a build up of steam, an increased pressure in the system and maybe even a steam explosion.
Wikipedia has reasonably good entries for nuclear incidents at Chernobyl, 3 mile island and K-19 amongst others.
Klaxon is a loud warning Siren mainly used for alerting citizens of a tornado or other disaster. A Klaxon is also used for alerting people of nuculer bomb.
The disaster occurred at the Chernobyl Nuclear Power Plant in Ukraine on April 26, 1986.
The most powerful natural disaster that can occur is a super volcano eruption.
a disaster hotspot is an area in which disasters are more likely to occur
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