Severe beyond design basis accident on Bilibino NPP EGP-6 reactor. Analysis of consequences of the radiological accident for public
Brief description is given in the paper of features of the VYBROS-3.1 code for evaluation of radiological consequences of radioactive release during normal operation and accidents on reactors of NPP for nuclear plant personnel and population within the area in the vicinity of the NPP site. Input meteorological data and information about the distribution of people on the area surrounding the Bilibino NPP (BiAES) are examined. Information about the source of radioactivity release generated based on the worst case (conservative) and the most probable approaches to the development of severe beyond design basis accident is presented. Analysis of radiation consequences of severe beyond design basis accident on EGP-6 nuclear reactor of the BiAES caused by introduction of positive reactivity caused by spontaneous shifting of two pairs of automatic control (AC) rods aggravated by complete failure of reactor safety system was performed using VYBROS-3.1 code. Accident developing according to the above scenario results in the severest possible scale of destruction of fuel and localizing safety barriers and represents the maximum possible case from the viewpoint of radiation impact on the population. Technical and organizational protective measures allowing mitigating these consequences in pursuance with requirements of acting regulatory documents are suggested. It is demonstrated that even in the case of radioactivity release under the conservative approach to the evaluation implementation of emergency protective measures in the form of evacuation of public will not be required.
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