Fire protection – Combustible Shielding in Instrumental Buildings Daniel Rosberg - WSP AB Dan Madsen – Grontmij AB Fredrik Jörud – ESS AB

2 Planning and Building Act (ESS ) Natural Fire => roof steel members No resistance & pillars 60 minutes

Radiation Protection Act (ESS ) “As far as reasonable practical, non- combustible materials should be used in installations” “Detect and extinguish quickly those fires that do start” 3

General Safety Objectives (ESS ) Ionization radiation 4 > 1 mSv to public within a return time of years > 20 mSv to public within a return time of years Demonstrate how to avoid: > 100 mSv to public within a return time of years

Recommendation to limit loss of property (ESS ) Recommendation to limit loss of property (ESS ) > 7 M€ => AUT SUPPRESSION > 50 M€ => AUT SUPPRESSION + ANALYSIS

Purpose: Evaluate how to handle the combustible shielding to meet requirements 6

SUMMARY  Install sprinkler in cave  Install sprinkler in hall ceiling  Allow only redesign of 1 instrument simultaneously OR apply 5 m safety distance  Keep HGV on 10 m distance to unprotected fire load  Keep field offices/labs on 2 m distance to unprotected fire load 7