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Chernobyl disater

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Hunter Huo

on 13 November 2012

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Transcript of Chernobyl disater

chernobyl Disaster Introduction The Chernobyl disaster is widely considered to have been the worst nuclear power plant accident in history, and is one of only two classified as a level 7 event on the International Nuclear Event Scale (the other being the Fukushima Daiichi nuclear disaster in 2011)

Once again, the human factor had to be considered as a major element in causing the accident. INSAG notes that both the operating regulations and staff handled the disabling of the reactor protection easily enough: witness the length of time for which the Emergency Core Cooling System was out of service while the reactor was operated at half power. How: Type of defects: Where: Chernobyl Nuclear Power Plant in Ukraine.
When: 26 April 1986
What: The disaster began during a systems test at reactor number four.
Video: Design Defects:
•The reactor had a dangerously large positive void coefficient; as the vapor phase in the reactor increases, fewer neutrons are slowed down. Faster neutrons are less likely to split uranium atoms, so the reactor produces less power. However, reactor four used solid graphite to slow down the neutrons, and the water in it, on the contrary, acts like a harmful neutron absorber. Thus neutrons are slowed down even if steam bubbles form in the water. Furthermore, because steam absorbs neutrons much less readily than water, increasing the intensity of vaporization means that more neutrons are able to split uranium atoms, increasing the reactor's power output. a Type of defects: Design Defects:

•A more significant flaw was in the design of the control rods. In the RBMK reactor design, the lower part of each control rod was made of graphite and was 1.3 meters shorter than necessary, and in the space beneath the rods were hollow channels filled with water. The upper part of the rod, the truly functional part that absorbs the neutrons and thereby halts the reaction, was made of boron carbide. With this design, when the rods are inserted into the reactor, it will effectively causing less neutrons to be absorbed initially. Thus for the first few seconds of control rod activation, reactor power output is increased. Summary: Chernobyl nuclear accident spread 100 times amount of radioactive substances compare with Hiroshima nuclear bomb explosion. Thirty one deaths are directly attributed to the accident, The Union of Concerned Scientists estimates that, among the hundreds of millions of people living in broader geographical areas, there will be 50,000 excess cancer cases resulting in 25,000 excess cancer deaths. According to the IAEA's 1986 analysis, the main cause of the accident was the operators' actions.

According to the IAEA's 1993 revised analysis the main cause was the reactor's design. Two ananlysis According to data, the radiative dust is flow to Ukraine, Russia, Belarus,Turkey, Greece, Moldova, Romania, Lithuania, Finland, Denmark, Norway, Sweden, Austria, Hungary, Czech, Slovakia, Slovenia, Poland, Switzerland, Germany, Italy, Ireland, France and England.

The most serious countries are Ukraine, Russia and Belarus. About 60% of radiative dust is flow into Belarus's land. Countries which are influence by radiative dust Data: 10 times: The Green-peace International organization of the world say that, the radiative of Chernobyl has been underestimate about 10 times
800 years: Experts say it need 800 years to treat the residual of the Chernobyl disaster
93,000: 93,000 people died because the Chernobyl disaster.
270,000: 270,000 people have cancer because the Chernobyl disaster.
600 millions: there are 600 millions people life are been influenced by the Chernobyl disaster. THANK YOU diagram Chernobyl Nuclear Power Plant sarcophagus The Chernobyl Nuclear Power Plant Object "sarcophagus" is a massive concrete envelope surrounding the nuclear reactor unit 4 of the Chernobyl Nuclear Power Plant. It is designed to halt the release of radiation into the atmosphere following the Chernobyl disaster on April 26, 1986 and encase the most dangerous area. It is situated within a large, restricted area known as the Chernobyl Exclusion Zone. The official Russian name is No 4. ukrytiye, which means housing or covering, as opposed to sarcophagus.The sarcophagus locked in 200 tons of radioactive corium, 30 tons of highly contaminated dust and 16 tons of uranium and plutonium.
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