Fire Protection of PE Radiation Shielding Daniel Rosberg, WSP

Borated PE – burning behaviour

Building fire protection EvacuationStructural elements

Building fire protection Fire compartmentationSurface lining materials

Rescue service operation + 30 MW

Instrument fire Length (m) Width (m) Height (m) Max HRR (MW)

Sprinkler  Sprinklerbild! Limited to 6 MW Will limit fire spread to secondary fuel packages. Still a 30 MW fire

Protecting the shielding material Safety distance +

Instrument during construction Borated PE 5 m – 6 MW 10 m – 30 MW 2 m – 1 MW 10 m – 30 MW Safety criteria: 135°C 7.4 kW/m 2

Instrument during construction Borated PE No limit 2 m – 1 MW 10 m – 30 MW 60 mm 1GF + 1 GA

Conclusions Fires  30 MW is the largest fire allowed  Rescue service operation  Roof construction  HGV fire is approx. 30 MW  Instrument fires can, however, be larger (90 MW) Is sprinkler required?  No if instruments can be limited in size  Yes if full flexibility is required  Instrument size  Number of instruments being unprotected simultaneusly

Conclusions How to protect PE  Encasing (#1)  Limit fire spread  Protected fire load  Safety distances (2-5-10)  Sprinkler  Small instruments …or…  Combination thereof