Chernobyl NPP Accident: What Did Happen?
Title: Microsoft Word – imanaka-1.doc Chernobyl NPP Accident: What Did Happen?
Author: IMANAKA Tetsuji
Reference: [PDF-956K]Apr 2009 Research Reactor Institute, Kyoto University
Keywords: childhood-thyroid cancer
Abstract:More than twenty years have passed since the worst accident in the history of nuclear power development occurred at the 4th block of the Chernobyl NPP in the former USSR. Although a lot of reports and books have been published about the Chernobyl accident, there are still remain unresolved issues about the physical sequences that led the reactor to the nuclear excursion and the nature of the explosion that destroyed the reactor and the building. From the present author’s point of view, the main causes of the accident were two defects of the RBMK reactor design: positive void coefficient for reactivity and positive-scram of the control rods. Under an extreme condition of the reactor core, positive scram effect appeared at first when the scram button (AZ-5) was turn on at 01:23:39 April 26, 1986, which, combining with the positive void coefficient, caused the power excursion and destroyed the reactor. Long-term effects of radioactive contamination by the Chernobyl accident were also discussed in the present paper.
URL: http://www.rri.kyoto-u.ac.jp/NSRG/Chernobyl/kek07-1.pdf
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