What was the function of this colossal structure near Chernobyl?

radar
heavy water radiator
protective screen
graduation tower
Duga was a Soviet over-the-horizon radar system used as part of the Soviet anti-ballistic missile early-warning network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl in the Ukraine and the other in eastern Siberia.
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radar
heavy water radiator
protective screen
graduation tower
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6%
29
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13%
15
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5%
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5052
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450
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6%
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43
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27%
8%
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104
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6%
29
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11
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17
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64
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22