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Review of Safety Systems for the LHC Experiments & Experimental Areas
Emmanuel Tsesmelis / TS-LEA
LEMIC
20 March 2007
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Scope of Review Review of safety systems for the LHC experiments and experimental
areas - participation from TS, PH, SC Aims of review:
Providers: Summarise specification of each safety system Present status and future plans for their realisation Describe links to the clients (i.e. experiments)
Clients: State position on the baseline specifications Present any additional requirements Describe actions to be taken upon reception of signals from the
safety systems How to organise and handle (overlapping) phases
Installation Commissioning/starting-up Maintenance and Operation
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Safety Systems Reviewed
Alarms and Monitoring CSAM RAMSES Sniffer Fire Detection & Oxygen Deficiency Monitor
Protection LACS & LASS Experiment Sub-sectorisation General Electrical Protection (AUL, AUG)
Limitation of Damage Associated Systems – Foam Extinguisher, Smoke
Ventilation, Flood Detection
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Major Issues Identified (I)
Experiments expressed need for the XCR to be the primary contact for safety interventions. All relevant safety information to be bundled there and
experiment SLIMOS/GLIMOS will play a central role in interacting with the Fire Brigade.
XCR to be central point of information where safety personnel must pass before undertaking any activity at the experiments.
Information centralised in the XCR. CSAM synoptic view of all Level-3 alarms. CSAM, Sniffer, RAMSES and Access Control consoles. Hardware link to Detector Safety System (DSS). Software information via Data Interchange Protocol (DIP) to
Detector Control System (DCS).
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Major Issues Identified (II)
Sniffer System Present specification of Sniffer limits number of gas types.
Experiments request flexibility for additional gases (e.g. SF6).
Adjustable alarm thresholds per sensor. Less strict smoke alarm thresholds when welding. Stricter CO2 alarm threshold levels when cavern open.
Global procedures for safety actions needed Who/what triggers safety actions? Remove risk of contradictory safety actions
ODH vs. Fire Detection Preference for manual rather than automatic actions
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Major Issues Identified (III)
Radioprotection Issues RAMSES operation. Handling of radioactive material. Consequences of INB procedures. Radiation screening for persons/material exiting LHC
experimental areas. Development and implementation of Patrol
procedures remains outstanding. Incorporation of intercom/public address system to
be revisited. Maintenance and fast 24/7 Piquet service.
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Treatment of Outstanding Issues
Action Definition Comment
2007 Request accepted; to be implemented in 2007
Technical implementation (TS Dept. or SC/RP) is in progress
tbd (to be defined) Request accepted; time frame & responsible of service to be defined
Technical implementation to be done by TS Department or SC/RP
tbc (to be confirmed) Request to be evaluated; ECR to be issued if accepted
To be taken up by Task Force (SC/PH/TS)
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General Conclusions
The Review proved to be a very useful exercise in analysing the LHC Safety Systems for the experiments & experimental areas.
The Review showed that good overall progress in installation and commissioning is being made to realise the baseline systems.
Several important issues related to the proper functionality of the safety systems were identified. Additional functionalities/procedures are being evaluated.
Safety Commission Provide (homogeneous) directives on several open safety policy
issues. New requests (from experiments) would otherwise create contradictions in
Safety Matrices if implemented as currently formulated. Prepare list of priorities.
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Procedurehttp://indico.cern.ch/conferenceDisplay.py?confId=10062
Under approval
Take implications regarding INB into account from the outset.