Chernobyl Disaster

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Chernobyl Disaster
Today, I am going to discuss about the biggest nuclear disaster that happened in the Worlds History. It’s called as Chernobyl disaster. This Disaster happened in Ukraine which was part of Soviet Union by then. It happened at the Chernobyl site between Pripyat and Chernobyl. The reason of this disaster is mainly human negligence and lack of knowledge. 25 April 1986...

It was a beautiful Friday night with cool breeze blowing with a slight humidity. People were in their homes sleeping. But nobody knew that this day would be a dangerous day in the world’s history. At 1:23 in the midnight of Saturday people woke up with two blast noises. Some came out from their houses while other saw from the window what had happened. People thought that it was a common fire and then went to sleep. The next day was a common day for people. They like usual woke up took a breakfast and went to their jobs. But after 2 or 3 hours later people started reporting problems like headache, metal tastes in their mouth and sensation of needles and pins all over their faces. Now I want to tell you what had actually happened.

The government of Soviet Union wanted to perform an experiment in the reactor 4 of Chernobyl plant which was to be shut down because of maintenance. The Soviets RBMKs reactor had a problem in them. The problem was that in the state of emergency Shutdown they lacked cooling water for 75 seconds which risked an explosion in the nuclear core. The experiment was to supply electricity to the cooling pumps even in the shutdown state. The government wanted to minimize the risk and for this purpose they had chosen the reactor 4. Alexsandr Akimov the night shift in charge was responsible for this test. He was not so competent and hadn’t been trained for this kind of experiment. He was always in a hurry from his childhood. So, he was not the right man for this experiment.

The experiment was to start in the day shift of workers when electrical engineers and other nuclear experts would be present but for a certain reason it was delayed until 12’o clock at night. This was the time when evening shift was going and night shift was coming. Alexsandr should’ve waited for the next shift but he didn’t bother about it and started this experiment.

The reactors normal capacity was 3200 MW. In the experiment it was to be lowered to 700 MW. They started to decrease its power for this experiment but because of his Akimov’s nature he did it in a hurry and by a mistake power dropped to 30 MW. It was too low and risked the shutdown of reactor. Anatoly Dyatlov, the deputy chief engineer, supervised the test. At the moment reactor power slipped to 30 MW thermal, he insisted the operators continue the test. He overrode Akimov's and Toptunov's (senior engineer) objections, threatening to hand the shift to Tregub (the previous shift operator who had remained on-site), intimidating them into attempting to increase the reactor power. At 1.00 clocks in the midnight of Saturday the power stabilized at 200 MW. They wanted to increase the power to 700 MW but failed so they continued with the experiment which was to be performed with 700 MW of power. Because of the low power the conditions of the reactor totally changed and didn’t match the conditions of the experiment any longer. All of the sudden the safety alarms turned on but they were ignored and many of them were disconnected so the main computer SKALA had no control any longer. All control was shifted to the operators. After 10 minutes the operators also lost the control over the experiment and the power increased to 33,000 MW which was 10 times higher than the capacity of the reactor. Now the first steam formed inside exploded and approx. 1000 ton metal plate on which the reactor assembly was fastened exploded. This was the first explosion that many heard. The explosion flipped this 1000 ton plate. After 3 seconds another heavy blast from the nuclear core itself happened and this was...
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