COOLING AND VENTILATION FOR THE HIRADMAT FACILITY Paul

COOLING AND VENTILATION FOR THE HIRADMAT FACILITY Paul PEPINSTER – Magali MENDEZ EN-CV 26/05/2011 Hi. Rad. Mat Review 1

Outline • Ventilation: – Requirements – Principles and functionnal analysis – Safety issues – Failure modes-consequences • Cooling: – Tests stands – Beam dump 26/05/2011 Hi. Rad. Mat Review 2

Hi. Rad. Mat ventilation overview 26/05/2011 Hi. Rad. Mat Review 3

Ventilation requirements: HRM area dynamic confinement 26/05/2011 Pression relative Zone TNC (par rapport à TA 7 et TCC 6) Débit d'extraction [m 3/h] 0 1000 2000 3000 4000 0 -5 -10 -15 Pression [Pa] • Irradiation area (TJ 7+TNC) underpressured compared to the neighboring zones at least 20 Pa. • Design extraction flow rate: 1000 m 3/h • First test performed with preliminary extraction system: 20 Pa is reached but with too high flow rate (2500 m 3/h) tightness to improve to extract less than 2000 m 3/h. -20 -25 Hi. Rad. Mat Review 4

Ventilation requirements: Flushing of the area Concentration • Dilution of the airborne contamination before access: dilution factor ≥ 600. • CFD study shows that it takes around 1 hour with 15’ 000 m 3/h • With the TNC area extended to TJ 7, could take 1. 5 – 2 hours 1 0. 9 0. 8 0. 7 0. 6 0. 5 0. 4 0. 3 0. 2 0. 1 0 Volume Averaged Concentration Maximum concentration Monitor limit value 0 10 20 30 40 50 60 70 Time (min. ) 26/05/2011 Hi. Rad. Mat Review 5

Ventilation: air extraction • • • High efficiency filtration (HEPA) H 14 Bag in – bag out filter box Rejection at BA 7 roof level : – – 26/05/2011 Requirement: v≥ 10 m/s, h≥ 2 m from roof surface 2 different flow rates = 2 chimneys Hi. Rad. Mat Review 6

Ventilation: shaft 846 • Only emergency exit for people working in TNC in case of fire • Instruction technique IT 246: – Differential pressure > 20 Pa compared to TNC (in access operating mode) – Air velocity through TNC/shaft door opening ≥ 0, 5 m/s (shaft upper level door being closed) to prevent smoke from invading shaft. • 2 air handling units: – N+1 redundancy – Flow rate = 3600 m 3/h 26/05/2011 Hi. Rad. Mat Review 7

Indoor conditions Zone Dry bulb temperature [°C] Dew point temperature [°C] TNC 25± 2 < 12°C ± 1°C PA 7 and TA 7 25± 2 Not controlled Shaft 846 Winter: 12± 3 Not controlled Summer: ≥ 12± 3 (no cooling) 26/05/2011 Hi. Rad. Mat Review 8

26/05/2011 Hi. Rad. Mat Review 9

Operating modes Mode Run/leak Flush Access AHU Smoke extraction On UACV 1 -00249 Off UUW 1 -00137 Off UUW 1 -00138 On (low speed) (60% of the extracted flow rate) On (high speed) On (low speed) On (high speed) On Off Off UACW 2 -00481 On Off Off UACV 1 -00253 On On UACV 1 -00254 Stand-by 26/05/2011 On (high speed) Hi. Rad. Mat Review 10

BA 7 UUW 1 -00138 0 -2000 m 3/h UUW 1 -00137 0 -16000 m 3/h UACV 1 -00249 0 -15000 m 3/h PA 7 shaft UACW 2 -00481 26/05/2011 TNC Hi. Rad. Mat Review 11

RUN mode (or leak mode) BA 7 UUW 1 -00138 0 -2000 m 3/h UUW 1 -00137 0 -16000 m 3/h UACV 1 -00249 0 -15000 m 3/h PA 7 shaft TNC area underpressured UACW 2 -00481 TNC doors closed 26/05/2011 Hi. Rad. Mat Review 12

RUN mode + drying BA 7 UUW 1 -00138 0 -2000 m 3/h UUW 1 -00137 0 -16000 m 3/h UACV 1 -00249 0 -15000 m 3/h PA 7 shaft TNC area underpressured UACW 2 -00481 TNC doors closed 26/05/2011 Hi. Rad. Mat Review 13

FLUSH mode BA 7 UUW 1 -00138 0 -2000 m 3/h UUW 1 -00137 16000 m 3/h UACV 1 -00249 15000 m 3/h PA 7 shaft UACW 2 -00481 TNC doors closed 26/05/2011 Hi. Rad. Mat Review 14

SHUTDOWN / ACCES mode BA 7 UUW 1 -00138 2000 m 3/h UUW 1 -00137 0 -16000 m 3/h UACV 1 -00249 0 -15000 m 3/h PA 7 shaft UACW 2 -00481 TNC doors open 26/05/2011 Hi. Rad. Mat Review 15

Smoke extraction (smoke in TNC) BA 7 UUW 1 -00138 0 -2000 m 3/h UUW 1 -00137 16000 m 3/h UACV 1 -00249 10000 m 3/h PA 7 shaft UACW 2 -00481 26/05/2011 TNC Hi. Rad. Mat Review 16

Smoke extraction (smoke in PA 7 area) BA 7 UUW 1 -00138 0 -2000 m 3/h UUW 1 -00137 16000 m 3/h UACV 1 -00249 10000 m 3/h PA 7 shaft UACW 2 -00481 26/05/2011 TNC Hi. Rad. Mat Review 17

Ventilation: fire safety issues Ventilation system stopped on fire detection Outdoor fire brigade switchboard Equipment secured power supply Location Type of supply Network UACV 1 -00249 fan UIAE-00249 876 -R 001 3 P+N+H Secured UUW 1 -00137 fan UIAC-00249 876 -R 001 3 P+N+H Secured UUW 1 -00138 fan UIAC-00249 UACV 1 -00253/254 fan UIAE-00251 876 -R 001 3 P+N+H Secured 846 3 P+N+H Secured Equipment 26/05/2011 Cubicle Hi. Rad. Mat Review 18

Ventilation: safety related to fluids Dehumidification unit UACW 2 -00481 in TA 7: – Chilled water for cooling coil; closed circuit, not contaminated, no risk. – Condensation water: collection into container (level controlled) for RP analysis. 26/05/2011 Hi. Rad. Mat Review 19

Failure modes - consequences Event Consequence Underpressure not reached before HRM Dynamic confinment of TNC not assured run Extraction UUW 1 -00138 fails during leak Dynamic confinment of TNC interrupted mode Air supply UACV 1 -00249 or air extraction UUW 1 -00137 during flush mode Airborne dilution not assured in TNC area Failure of air supply UACV 1 -00253 (shaft Overpressure in shaft 846 not assured 846) Others? 26/05/2011 Hi. Rad. Mat Review 20

Hi. Rad. Mat cooling overview 26/05/2011 Hi. Rad. Mat Review 21

Cooling of the tests stands (1) Users requirements Users water flow rate need at ΔP = 8 bar Test bench 3 m 3/h Required cooling power Water supply temperature 30 k. W 27°C Refurbishment of the former « collimator cooling station » in TA 7: • Existing pumps conserved • New heat exchanger • New expansion vessel Cooling station parameters Deliverded flow rate at ΔP = 7 bar Delivered cooling power Primary side temperatures [°C] Secondary side temperatures (users) [°C] Test bench 26/05/2011 4 m 3/h 35 k. W 24 -34 Water leak is collected by the drainage and sump 27 -37 Hi. Rad. Mat Review 22

Cooling of the tests stands(2) • • • 26/05/2011 Primary side: raw water from « SPS loop » BA 7 Secondary side: demi water (closed circuit) Safety valves in TJ 7 close in case of leak detection Hi. Rad. Mat Review 23

Cooling of the beam dump Users requirements Users water flow rate need at ΔP = 8 bar Beam dump 15 m 3/h Required cooling power Water supply temperature 250 k. W 27°C Connection to the BA 6 beam transfer circuit Cooling parameters Deliverded flow rate at ΔP = 8 bar Delivered cooling power Primary side temperatures [°C] Secondary side temperatures (users) [°C] Beam transfer circuit 26/05/2011 15 m 3/h 250 k. W 24 -34 Water leak is collected by the drainage and sump 27 -42 Hi. Rad. Mat Review 24