Safety Systems for ALICE

1
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
• SNIFFER air sampling system for detection
  of - ODH Oxygen Deficiency Hazard -
  Flammable gas leak - Smoke from fire and
  hot-spots sends alarms to CSAM

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CSS CERN Safety System
SCR Fire Station
TCR Tech. Specialists

CSAM

• 9 types of
• Detectors of Hazards

SNIFFER System ODH, Fl.Gas, Smoke
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CSAM - general

• 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

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CSAM - inputs
9 possible types of entries, including the
SNIFFER

• 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

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CSAM some inputs
Some safety systems are already in place at Pt-2

• 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

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CSAM example of inputs

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CSAM - outputs

• 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.

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Sniffers racks
9
Sniffer tubes
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CSAM - actions

• CSAM sends alarms to the firemen.
• Whats 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)

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Open Safety Issue

• 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 ?