HAZOP study

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HAZOP study

• HAZard OPerability Study
• Performed for the
• CNGS Horn Exchange Procedure

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Horn exchange procedure

• Disconnect Fast Coupling
• Take out Stripline Link
• Move stripline part 1
• (open)
• Remove shielding
• (roof passage side wall)
• Exchange horn ()
• Build up shielding
• Move stripline part 1
• (close)
• Put Stripline Link back
• Connect Fast Coupling

() Take old horn from lower frame out and
store Bring down new horn and install on lower
frame
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HAZOP study (recommended by 2004 CNGS Review)

• write specification
• (incl. Horn exchange procedure)
• 2) make call for tender (at least 5 companies)
• 3) choose company, agree on dates
• -gt agree on sequences in horn exchange procedure
• -gt agree on keywords
• -gt HAZOP meeting (2.5 days) 15-17 June 2005
• -gt approve minutes
• -gt follow-up on actions
• -gt review actions (phone conference)
• -gt presentation of HAZOP report 2 Sept. 2005

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Loss of Services Provision of, use and loss
of services inc. gas, compressed air,
ventilation etc. Shielding Provision, amount
and lack of shielding material within and
around active areas with operator
access Ventilation Provision of containment
Air movement Fire / Explosion
Flammable materials Cause for
ignition Underground explosion Mechanical
Handling Assembly Disassembly Misalign
ment Reliability Maintainability
Frequency Difficulties Operator
activities Remote Handling Operational
issues Corrosion / Erosion Material
types Methods for material breakdown
Keywords
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HAZOP study
The meeting
HAZOP team leader HAZOP secretary CNGS - A.
Calderone (crane expert) - J. Gulley (general
safety) A. Pardons (horn replacement) - S.
Rangod (horn design / construction) - S.
Roesler (radiation protection) - K.
Elsener ½ day site visits and introduction 2
days HAZOP study, step by step
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HAZOP study
Was it worth it ?

• We could have done this by ourselves!
• -gt Yes, but would we have taken the time to do
  it
• in enough detail ?
• -gt Would we have done in an officially
  recognized,
• traceable manner ?
• We did not really learn anything!
• -gt maybe true for some persons
• but having some items pointed out in a clear
• manner and documented now allows no escape
• 3) Would we do it again?
• -gt could be useful for other, more frequent
• interventions in hot areas at CERN

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CNGS Horn Assembly

• 7 meters long
• Weight 1500kg
• 2 cradles for handling (centre of gravity)
• Electric (manual) water connections (automatic)
• at downstream end

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Hot handling HAZOP
Hazard Operability study for horn exchange
1) write specification (incl. Horn exchange
procedure) 2) make call for tender (at least 5
companies) 3) choose company, agree on dates -gt
agree on sequences in horn exchange procedure -gt
agree on keywords -gt HAZOP meeting (2.5 days)
15-17 June 2005 -gt approve minutes -gt follow-up
on actions -gt review actions (phone
conference) -gt presentation of HAZOP report 2
Sept. 2005
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Horn exchange
Life time of horn (95 confidence) 20 million
pulses 5 years

• Highly radioactive zone
• Maximize remote automatic
• ? Minimize dose
• Define detailed procedure
• (interaction with RP experts)
• ? Do complete exercise
• (realistic conditions)
• ? Documentation (photo, film)
• is extremely important!

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Horn exchange procedure

• Disconnect Fast Coupling
• Take out Stripline Link
• Move stripline part 1
• (open)
• Remove shielding
• (roof passage side wall)
• Exchange horn ()
• Build up shielding
• Move stripline part 1
• (close)
• Put Stripline Link back
• Connect Fast Coupling

() Take old horn from lower frame out and
store Bring down new horn and install on lower
frame
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Remove old horn
Horn vs. lower frame
100 Remote
from target chamber to radioactive storage
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Install new horn
50 Remote
New,  clean  horn
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Build up shielding
100 Remote 
after
before
Storage blocks
Coordinates recorded during exercise
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Short movies
Preview
Move the Stripline Link (upstream) (240)
Installing the Stripline Link plates close the
5 bolts of the Fast Coupling (50' )