Swedish to English Tech/Engineering Energy / Power Generation Power station water circulation

Under vecka 10 pågick arbeten med brandvattensystemet i kraftvärmeverket för avfallsbränslen

This is not sprinkler water for a fire extinguishing system, but the 'brandvatten' in these references:

http://www.ramboll.se/aktuella_uppdrag/aktuella_uppdrag_las_...

http://www.sundsvallenergi.com/Innehåll/Dokument/Miljödokume...

(In the PDF, 'brandvatten' seems to apply to the system in the pink square with the oval "Nuvarada sedimenteringsbassäng")

Neither of these is the text I am translating; it is a letter without a lot of technical details...

Thanks for any plausible suggestions!