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Safety Systems for ALICE

DSS = Detector Safety System under the responsibility of ALICE (“safe” part of DCS) treats Level 1 and 2 alarms CSAM = CERN Safety Alarm Monitoring under the responsibility of TS-CSE (former ST-MA, contract B1171/ST) treats Level-3 alarms

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Safety Systems for ALICE

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  1. DSS = Detector Safety System under the responsibility of ALICE (“safe” part of DCS) treats Level 1 and 2 alarms CSAM = CERN Safety Alarm Monitoring under the responsibility of TS-CSE (former ST-MA, contract B1171/ST) treats Level-3 alarms SNIFFER = air sampling system for detection of - ODH = Oxygen Deficiency Hazard - Flammable gas leak - Smoke from fire and hot-spots sends alarms to CSAM Safety Systems for ALICE

  2. 9 types of Detectors of Hazards CSS = CERN Safety System SCR = Fire Station TCR = Tech. Specialists CSAM SNIFFER System ; ODH, Fl.Gas, Smoke

  3. Highly reliable alarm transmission system Based on PLC and SCADA industrial technology Supported by international safety standards Available 24h/d, 365d/y Defined by the AL3S working group Designed for CERN, not only for LHC Approved by SC (TIS), including experienced firemen Approved by TCR representatives INB compliant Maintenance integrated in the Maintenance Manager System CSAM - general

  4. Smoke detectors ~ 40 ~ 5 Flammable gas detectors ~ 20 ~ 5 ODH detectors ~ 10 ~ 5 Water detectors (flooding) ~ 10 Evacuation signals ~ 40 Red buttons ~ 50 Red telephones ~ 10 Dead-man detector ~ 1 Blocked lifts ~ 2 CSAM - inputs 9 possible types of entries, including the SNIFFER :

  5. Smoke detectors in SX-2 and SXL-2 * in UX-25 * Evacuation buttons and alarm everywhere * Red buttons // * Red telephones // * (Note that the normal phones have been dismantled from underground areas.) Blocked-lift alarms in lifts * to be rejuvenated in 2005 ODH and gas detectors to be defined CSAM – some inputs Some safety systems are already in place at Pt-2:

  6. CSAM – example of inputs

  7. CSAM sends alarms to : Safety Control Room (SCR, fire station), they send the firemen. Technical Control Room (TCR), they send the relevant specialists if needed. Note: Installation planned in April-May 2004 at Pt-2. DSS/DCS sends alarms to ALICE Control Room. CSAM - outputs

  8. Sniffers racks

  9. Sniffer tubes

  10. CSAM sends alarms to the firemen…. What’s next ?? Cut the power (+ gas) at the place of alarm If the alarm comes from UX-25  request to stop the beam send the firemen + relevant specialists If the alarm comes from inside L3 magnet  flush N2 ? (under study) CSAM - actions

  11. Fire detection (and fire fighting) in Electronic Racks: Proposal from TS-CSE = - 1 smoke sensor per ‘normal’ rack - signal sent to DSS for automatic action to be defined - one possible action = cut-off power of the Hazemayer powering ( 1 or ) 23 racks. Possible solution = - 2 smoke sensors per rack - wired logic cutting of power of the given rack + signal sent to DCS for info Required automatic fire-fighting ? Open Safety Issue :

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