Abstract
The radiological environment following a severe nuclear accident can be visualised on building layouts. The direct radiation in an area (or room) can be visualized on the layout by a colouring scheme depending on the dose rate level (for example orange for high gamma dose rate level and purple for an intermediate gamma dose rate level). Following the Fukushima accident, a need for update of these layouts has been identified at the Swedish nuclear power plant of Forsmark. Shielding calculations for areas where access is desired for severe accident management have been performed. Many different sources of radiation together with different types of shielding material contribute to the dose that would be received by a person entering the area. External radiation from radioactivity within e.g. pipes and components is considered and also external radiation from radioactivity in the air (originating from diffuse leakage of the containment atmosphere). Results are presented as dose rates for relevant dose points together with a method for estimating the dose rate levels for each of the rooms of the reactor building.
Highlights
In case of emergency and during drills, layouts describing the radiological environment within the reactor building are used by the emergency preparedness organisation or the first responders team
New equipment is installed following Fukushima, updated accident management strategies need to be considered and results from recently updated calculations of core inventory release fractions need to be taken into account
Radioactive nuclides of the following elements were included in the source term: Xe, Kr, Cs, I, Te and Sb
Summary
In case of emergency and during drills, layouts describing the radiological environment within the reactor building are used by the emergency preparedness organisation or the first responders team. A mapping of the radiological environment can provide support when planning accident management. Existing layouts for the three boiling water reactors of the Swedish nuclear power plant Forsmark, need to be updated. New equipment is installed following Fukushima, updated accident management strategies need to be considered and results from recently updated calculations of core inventory release fractions need to be taken into account. A project aiming to provide dose estimations for relevant dose points has been carried out by Vattenfall Engineering on behalf of Forsmark. The project is ongoing and it will be finalized during the spring 2016
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