Certain areas at Forsmark Unit 1 and 2 do not comply with new regulations from the Swedish Radiation Safety Authority regarding physical separation of components. One purpose of the physical distance is to make sure that if a fire occurs, it will not be able to spread to a redundant system in the same room. To meet these new regulations, fire protection in these rooms needs to be improved. Initially, conventional fire suppression systems like gas extinguishing systems were considered. However, during the early system design phase, risks were identified: they would require complex installation in rooms with sensitive equipment, and could pose risks to personal safety. So alternative solutions were considered. The use of an oxygen reduction system (ORS) was one of them.
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