Turning of the cooling system was an unnecessary action and though it did not cause the explosion, it made the consequences more fatal. Just then the operator's receive a call from the local grid controller in Kiev, who needed the power and asked the technicians to stop lowering it, at what they obeyed. Once that was done the reactor was running with out the cooling system, which was a very serious mistake. At 11:10 p.m. the grid controller said he no longer needed the power, and the operators returned to reducing the power. At twenty minutes past midnight the operators forgot to set the regulator properly, it was the second fatal error. Because of the incorrect regulator settings the reactor's power crashed to 30 MW from 1,000 MW, which is too low for the test. At that point the operators would have abandoned the experiment, but they attempted to rescue it, for the next time they would be able to conduct would be in one year only. The senior authorities that had ordered the test would have been furious and would have found out the regulator problem. So the operators decided to pull out the stops to restore the reactor's power. Their third fatal mistake was the pulling the control rods out. The plant's rule was to have thirty in at all times however they left all but six. By 1:00 Am the power risen to 200 MW, which was still to low for the experiment, however the operators continued. In a few minutes they made their fourth fatal error, by turning on two extra pumps to join the six that wee already cooling the core. This procedure under such low power caused a massive steam disorder. Their fifth fatal error was the turning off of the automatic shut off, which would turn off the reactor. At 1:23 a.m. on Saturday April 26, the workers began the actual experiment. They made their sixth error, byturning off the last safety system. It took the shift manager thirtyseconds to realize what was happening and shouted at another operators to press button AZ-5 which would driven all the control rods back into the core, but because the rods were melted from serious heat they didn't fit properly into the core. As the manager gloomy eyed looked down at the control panel several loud banging noises were heard. Immediately the one thousand tone roof of the reactor blew off sky high, and brought down the giant two hundred tone refueling crane onto the core, destroying more cooling systems and 30 fires spread around the plant. Finally the over-heating and steam build up caused a second explosion which destroyed the reactor and part of the building. The graphite began to burn ferociously once exposed to air, as corereached temper

Some common words found in the essay are:
Nagasaki Hiroshima, Soviet Union, Western World, Hamburg Yeltzinsaid, West Germany, Ottawa Canada, Moscow Minsk, Union Chernobyl, Atomic Institute, Unlike Chernobyl, soviet union, soviet officials, fatal error, cooling system, reactor's power, causes explosion, reactor exploded, stay rain, rest world, radiation spread,
Approximate Word count = 1771
Approximate Pages = 7 (250 words per page double spaced)