SAFETY and COMMISSIONING

1
SAFETY and COMMISSIONING
2
Introductory remarks

• Remarks on safety issues
• Of general nature
• Concerning several systems and their interference
• No detector specific issues
• Commissioning treated from the safety point of
  view

3
OUTLINE

• Safety organization
• Safety
• Access
• Communications
• Gas
• Commissioning
• Co-activities of commissioning and installation
• Operating conditions

4
Safety organization

• Agreed with TS on a new sharing of
  responsibilities at P2 in 2004
• Adjusted the organization and working habits
  accordingly
• The installation work is defined as a series of
  Work packages
• The organization of the execution of the work
  packages is shared between PH and TS
• All installation activities are described in task
  procedures and checked by a special safety
  coordinator
• Task procedures and inspection reports are
  documented on EDMS, see link in EDMS 530025
• This organization is now established and works
  well

5
Safety Organisation
6
Safety organization

• Access and safety procedures for ALICE
• Documented in EDMS 452686
• Explained at several collaboration meetings
• Wearing of personal protection
• Reinforced compliance
• Supervision of work and safety
• Missing personnel for permanent supervision of
  all work sites at P2

7
Access

• Access to sub-detectors
• Inside L3 solenoid
• µ chambers
• Restricted areas
• L3 case
• µ arm

8
Access inside L3

• RB24 side
• Passage along side of space frame
• Access below space frame

9
Access inside L3

• Platforms on RB26 doors
• Access to TOF and TRD being improved

10
Access µ chambers
tapis volant
11
Restricted areas

• Inside L3 solenoid
• RB26 side during installation
• Access essentially from RB24 side
• Escape route through FASS
• Follow two person rule (Safety Code A6)
• Limit number of persons in the area
• 4 persons with TPC in nominal position
• 8 persons during ITS etc installation

12
Restricted areas
Access to TPC, ITS on RB26 side and FASS
Back frame
Space frame
TPC
FASS
Front absorber
13
Restricted areas

• µ arm
• FASS
• Access from µ arm side, escape route through L3
• Dipole
• Access between L3 and dipole
• Access between ST3 and ST4
• Below µ arm
• Follow two person rule (Safety Code A6)
• Limit number of persons in each area
• 2 persons between tracking stations 1 to 4
• 6 persons below µ arm

14
Restricted areas
Access ST1 / ST2
Access ST3 / ST4
Access ST2 / ST3
15
Communications

• Communications between spaces inside the
  detector and the outside world
• Below µ arm
• Inside µ arm (FASS, Dipole)
• Inside L3 solenoid
• Have to verify functionality

16
Gas

• During installation / commissioning only
  non-flammable gas mixtures will be used
• HMPID will fill CH4 shortly before first beam
• Gas detection and ODM available
• ODM inside L3 and below µ arm
• Reinforced ventilation inside L3 during
  installation

17
Commissioning

• Separate installation and commissioning
• Installation during day time
• Commissioning during night time
• Avoid co-activities in each area
• Minimize co-activities by scheduling and
  coordination
• Limit on number of persons
• Limit from access means

18
Commissioning

• Detector operating conditions during installation
• Definition of conditions under way
• Examples
• Restrictions on HV and LV
• No TPC drift HV during installation in solenoid
• Power down nearby detectors / modules
• Permit TOF / TRD commissioning during ITS
  installation

19
Conclusions

• Safety organization in place and working
• Concerns about permanent supervision
• No intrinsically dangerous operations
• Strict scheduling, coordination and procedures
  have to limit risks from
• Access difficulties
• Concurrent activities