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    Chernobyl Chernobyl Presentation Transcript

    • Chernobyl Accident by Sibel Tekmen April 1986
    • Chernobyl disaster
        • nuclear accident near town of Pripyat
        • April 26, 1986
        •   Chernobyl Nuclear Power Plant
        •   Ukraine
        •   worst nuclear power plant accident in history
        •   only level 7 event on the International Nuclear Event Scale
    • The Accident
        • 01:23 a.m.
        •   reactor 4 suffered a power increase
        •   explosions in the core
        • dispersed large quantities of fuel and core materials into the atmosphere and ignited the combustible graphite moderator
        • the graphite moderator increased the emission of radioactive particles, carried by smoke
        • reactor had not been contained in any kind of hard containment vessel
        • during an experiment scheduled to test a potential safety emergency core cooling feature
    • The Accident Cont.
        • No. 4 reactor exploded and released thirty to forty times the radioactivity of the atomic bombs dropped on Hiroshima and Nagasaki
        • world first learned of the nuclear accident from Sweden, where abnormal radiation levels were registered in nuclear facilities
        •   when attempt was made at the emergency shutdown, a more extreme power output occurred which led to the rupture of the vessels and explosions
        • exposed the graphic moderator of the reactor to air and they ignited, resulting in fire sent a plume of radioactive fallout into atmosphere and area
        • plume drifted over parts of the western Soviet Union, and also much of Europe
    • Conditions Prior to the Accident
        • reactor was running at full power, slowly operators began to reduce the power
        • 12 hours after, running at 50% power
        •   only one turbine needed for steam, so turbine #2 switched off
        •   under normal conditions, the test reactor would have been reduced to 30%, but Soviet electricity authorities refused to allow this because of the need for electricity elsewhere
        •   staff received permission to resume the reactor power reduction, but one operator made a mistake, instead of keeping power at 30%, he forgot to reset the controller, which caused the power to plummet to 1%
        • operator forced the reactor up to 7%, by removing all but 6 of the control rods-a violation and reactor was never built to operate at such ow power
        • instead of enabling the emergency shutdown, they disabled it because that would abort the test
    • Afterwards
        • city of Pripyat was not immediately evacuated
        •   population of the Soviet was not informed of the incident until April 29
        • only after learning from Sweden, did Soviet union admit that accident had occurred
        • authorities attempted to conceal the scale of accident
        •   gov. commitee was formed as announced to investigate the accident
        •   evacuation began on April 27, residents were to bring only what was necessary since the authorities said it would only be temporary and last approx. 3 days, as a result, residents left most of their belongings, which can still be found today
    • Effects
        • fire in building and radiation led to 28deaths
        • International spread of radioactivity
        • Sweden
        • Finland
        • Belarus
        • Ukraine and Russia
        • spread by weather
        • 237 people suffered acute radiation sickness, 31 died within firste three months
        • Radioactivity to environment
        •   health effects: cancer, birth defects, radiation poisoining