site.btaConservative Estimate of Potential Consequences for Bulgaria in Case of Serious Accident at Ukraine's Zaporizhzhia NPP

Conservative Estimate of Potential Consequences for Bulgaria in Case of Serious Accident at Ukraine's Zaporizhzhia NPP
Conservative Estimate of Potential Consequences for Bulgaria in Case of Serious Accident at Ukraine's Zaporizhzhia NPP
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BTA approached the Nuclear Regulatory Agency (NRA) for an opinion regarding a comment on Wednesday by a high-ranking Russian diplomat that Bulgaria will be among the affected countries  in the event of a serious accident at the Zaporizhzhya nuclear power plant (NPP) in Ukraine.

NRA said that in predicting the potential consequences for the population and the environment in the event of a transboundary movement of radioactive material following a serious accident at a nuclear power facility outside Bulgaria, account is taken of a range of factors such as the degree of damage to the facility, the distance of the facility from the territory of Bulgaria, meteorological data including wind direction and speed, precipitation, and specific characteristics of the radioactive discharge (quantity and radioisotopic composition). 

NRA said that they carried out a conservative assessment using JRODOS, a real-time online decision support system for nuclear emergency management. The JRODOS assessment was made on the basis of the most unfavourable conditions for potential contamination of the territory of Bulgaria, e.g., occurrence of a severe accident exceeding many times the design characteristics of the source NPP, increased wind speed value, with assumed wind direction directly towards the territory of Bulgaria, no precipitation along the pathway of the airborne radioactive material, and radioisotope composition of the discharge assumed as typical for VVER-1000 reactors. 

The result of the conservative assessment showed that the potential impact on the environment and the population in Bulgaria from a serious accident at Zaporizhzhya NPP can only be expected in certain areas in close proximity to the north-eastern border of the country. The impact is not expected to exceed the thresholds that require application of urgent protective measures. Protective measures related to the restriction of consumption of certain foods and agricultural produce may be necessary in some cases. The assessment showed that the time for the contamination to reach the territory of Bulgaria is approximately 22 hours from the time of the radioactive discharge. NRA noted that a need for protective measures may arise only in respect of parts of the affected areas and population. 

/ZD/

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By 11:27 on 03.10.2022 Today`s news

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