R2E Report – P5 Safe-Room Update 20 th LSC Meeting, September 13 th 2013 CERN Radiation 2 Electronics (R2E) Project 20 th LSC Meeting September 13 th 2013 Safe-Room Update P5 EN/CV, EN/EL, GS/SE, GS/ASE, EN/MEF

R2E Report – P5 Safe-Room Update 20 th LSC Meeting, September 13 th

R2E Report – P5 Safe-Room Update 20 th LSC Meeting, September 13 th 2013 P5 Safe Room Baseline 3 Reminder: Air-In/Outlets: final configuration implemented with three inlets (from UL558) and two outlets (in UL557) [<40°C] all with dedicated fire-dampers AHUs located in UL558 on separate structure Control logic (ventilation flow, dampers) as a function of fire detection Temperature simulations performed for various scenarios Maintenance!!!

R2E Report – P5 Safe-Room Update 20 th LSC Meeting, September 13 th 2013 Critical Scenario 4 1kW 0.6 kW 0.8 kW 1kW kW 0.8 kW Air In Air Out UL558 UL557 (Bypass) Fire in UL557: Fire dampers close Heat builds-up Affects installed equipment after a given time Approach: Estimate worst-case/most-likely scenario Adopt layout to mitigate possible issue X X

R2E Report – P5 Safe-Room Update 20 th LSC Meeting, September 13 th 2013 Temperature: No Air Circulation 5 © CFD Team E. Da Riva, G. Camplone 3-Operation Cases: Chargers working + 3 additional racks (unilkely) [7.6kW] Chargers working + no additional racks (unilkely) [4.6kW] Normal Operation + no additional racks (probable) [2.7kW] 2h: 85ºC 2h: 60ºC 2h: 45ºC

R2E Report – P5 Safe-Room Update 20 th LSC Meeting, September 13 th One of the ducts operated in reversible way Two General Solutions TOP VIEW 6.5 m 1.5 m 5 m Acceptable Temperatures (in case of fire) Technically Possible Additional system complexity Possible impact on reliability © CFD Team

R2E Report – P5 Safe-Room Update 20 th LSC Meeting, September 13 th One additional duct between UL557/558 By redirecting former outlet with damper Either: through fire resistant duct Or: by slightly extending safe room structure No special operation required in case of fire Similar cooling efficiency Two General Solutions

R2E Report – P5 Safe-Room Update 20 th LSC Meeting, September 13 th Possible critical situation identified during late design stage Mitigation options studied Two (general) solutions identified Preferred/Proposed Implementation: Additional duct drilled for common operation Safe-Room extension Only one remaining case when air-flow is stopped Fire in UL558 (risk very low) Temperature rise critical, but not a show-stopper Summary MANY THANKS TO ALL