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Patrolling the LHC
M. Gruwé
AB-OP
LEMIC
September 4th 2007
September 4th 2007 M. Gruwé 2
Layout• Why?
– Role of the patrol• When?• Who?
– Patrol team• How?
– Procedure– Example: Documents (patrol circuit, check lists)– Validation of procedure– Status
• Note: – Procedure still to be fully documented and validated by DSO and group
leader– Patrol circuits still to be validated by DSO and group leader
September 4th 2007 M. Gruwé 3
Why?
• Role of the patrol:– Make sure no-one is left inside the LHC interlocked
zones with no access key.– Make sure the LHC interlocked zones are in a state
allowing to put beam in
• Result of the patrol of a sector: “SEARCH” signal activated for the given sector.
• Beam mode allowed only if ALL “SEARCH” signals activated in the whole LHC.
September 4th 2007 M. Gruwé 4
When?
• Patrol required– After a sector has been accessed in “General mode”
(no access key required to go in).– Whenever a door is forced (emergency exit): the
“SEARCH” signal drops for the corresponding sectors.
• Either someone is forcing his way in or someone was in and tries to go out! In any case: a patrol is required.
– Whenever a “SEARCH” signal drops.• Beam is not allowed until all “SEARCH” signals are rearmed
anyway.
September 4th 2007 M. Gruwé 5
Who?
• Each point is divided into sectors which are patrolled independently from each other.
• Machine sectors: responsibility of AB – Beam areas – Service areas
• Experimental areas: responsibility of experiments
September 4th 2007 M. Gruwé 6
Sectors (example)
Point LHC 8
LHCb
September 4th 2007 M. Gruwé 7
Patrol team
• Patrol leader:– Patrol team consists of at least two people, including
one patrol leader (trained and qualified)– The patrol is under the responsibility of the patrol
leader– The patrol leader assures
• the sector is empty (no-one left in)• the sector is in a state such that the beam can be put in
September 4th 2007 M. Gruwé 8
How?• Plan the patrol• Before leaving the CCC:
– Fill in logbook– Check list: all doors to be closed– Get tools
• Before patrolling a sector:– Close all doors– Check with CCC
• Patrol:– CCC activates patrol signal for the given sector– Search the sector– Rearm all search boxes– Check with CCC– CCC removes patrol signal for the given sector
• After patrolling, return in CCC:– Fill in the logbook
September 4th 2007 M. Gruwé 9
Search boxes
Associated to a sector door:
Simple search box:
September 4th 2007 M. Gruwé 10
Planning the patrol
• The zone to be patrolled should be in restricted access mode
• The patrol leader checks that the sector is a priori empty:– No activity foreseen in the zone– Counters show 0 people in the zone
September 4th 2007 M. Gruwé 11
Before leaving the CCC
• Patrol leader fills in the logbook indicating:– Date and time of departure– Sectors to be patrolled– Name of patrol leader
• Check on the LASS panel the EIS to be closed and emergency exit systems to be rearmed:– EIS = “Elément Important de Sûreté” (=doors, etc…)– Fill in the check list for each sector to be patrolled
• Patrol leader gets from the CCC a set of tools…
September 4th 2007 M. Gruwé 12
Tools
• Bundle of keys– Patrol key– Master-key LEP10000– …
• Tools for rearming the emergency exit systems• Safety equipment
– Safety shoes– Helmet– Biocell– Lamp– Dosimeter– …
• Possibly: bike or other relevant equipment
September 4th 2007 M. Gruwé 13
On site: before patrol
• Before patrolling a sector:– Use the check list filled in the CCC to close all EIS of the sector:
• End of zone doors
• Sector doors
• Trapdoors
• Mobile shielding walls
• etc…
– Rearm the emergency exit systems on all doors of the sector– Patrol leader checks with the CCC:
• All doors closed
• All emergency exit systems rearmed
September 4th 2007 M. Gruwé 14
Patrol (I)
• Patrol leader asks the CCC to– Activate the “patrol” signal for the given sector
• All search boxes “drop”• All doors of the sector are now locked:
– To open the door, one needs the patrol key: only the patrol can access the sector.
– (Doors can still be opened using the emergency system but search boxes would then drop again)
• Patrol team enters the sector to be patrolled, using the “patrol key”
September 4th 2007 M. Gruwé 15
Patrol (II)
• Patrol team– Searches the sector according to the predefined patrol circuit
• Circuit description
• Pictures
• Maps
– Calls out– Rearms the patrol boxes of the sector using the “patrol key”
• Check list
– If a person is found in the sector:• Either cancel the patrol: patrol will be redone at a later stage, when
situation is clarified
• Or, the person becomes part of the patrol team and is escorted back outside
September 4th 2007 M. Gruwé 16
End of patrol
• Patrol leader checks with CCC:– All patrol boxes are rearmed
• Patrol team exits the sector using the “patrol key”• Patrol leader asks the CCC to remove the “patrol” signal
for the given sector– Sector is now in “restricted” access mode: doors are unlocked– The “SEARCH” signal for the sector is armed if:
• All doors are closed• All emergency exit systems are rearmed• All search boxes are rearmed
• CCC confirms to the patrol leader the “SEARCH” signal has been rearmed for the given sector
September 4th 2007 M. Gruwé 17
Returning to the CCC
• Patrol leader fills in the logbook:– Date and time of return– Sectors patrolled (successfully or not)– Any comment or observation– Possibly reason for cancellation or failure of patrol
September 4th 2007 M. Gruwé 18
Example
• Patrol circuit for point LHC 8, sector 10– Summary– List of maps– Access to the sector– Detailed patrol procedure– Maps
• Checklist for point LHC 8, sector 10
(edms document)
September 4th 2007 M. Gruwé 19
Procédure et circuit de patrouilleLHC 8 secteur 10
Nombre minimum de patrouilleurs : 2, appelés A (chef de patrouille) et B
Nombre de niveaux : 2
Nombre de boîtes de patrouille : 3
YZBPB01=UP84
YZBPB01=UX852
YZBPA01=UX851
EIS :
Porte de secteur YCPS01=UW85
Porte de secteur YCPS02=UW85
September 4th 2007 M. Gruwé 20
Procédure et circuit de patrouilleLHC 8 secteur 10
Plans
• Vue d’ensemble: POINT8 accès via SD8• Surface : SD8• Accès : US85 secteur 1• Circuit: UW85
September 4th 2007 M. Gruwé 21
Procédure et circuit de patrouilleLHC 8 secteur 10
Accès
• Accès dans la zone en surface par le point d’accès en PM85 (bâtiment SD8).
• Descente par l’ascenseur. Arrivée dans US85.• Deux portes donnent accès au secteur 10 à partir du
secteur 1 (en US85), à gauche en sortant de la zone pressurisée (voir photos) :
September 4th 2007 M. Gruwé 22
Procédure et circuit de patrouilleLHC 8 secteur 10
Déroulement de la patrouille (I)
Le secteur 10 (UW85) comprend deux niveaux. L’accès se fait au niveau inférieur.
Niveau supérieur :– A accède au niveau supérieur (plateforme) par une échelle située en face de la
porte de gauche (YCPS01=UW85). – B attend au pied de cette échelle.– A va jusqu’au fond et vérifie à gauche et derrière l’équipement situé tout au
fond.– A réarme la boîte de patrouille (YZBPB01=UW85) située à droite tout au fond
du local.
September 4th 2007 M. Gruwé 23
Procédure et circuit de patrouilleLHC 8 secteur 10
Déroulement de la patrouille (II)
Niveau inférieur :– A rejoint B au niveau inférieur, au pied de l’échelle d’accès au niveau
supérieur.– B attend A.– A va au fond du secteur et vérifie la fosse qui s’y trouve.– A fait le tour du niveau inférieur puis rejoint B.– A réarme la boîte de patrouille (YZBPA01=UW85) située près de la porte
d ‘accès de droite (YCPS01=UW85).– A et B entrent dans le local technique sur la gauche.– Avant de sortir du secteur, A réarme la boîte de patrouille (YZBPA02=UW85)
située près de la porte d’accès (YCPS02=UW85).Fin de la patrouille du secteur 10.
September 4th 2007 M. Gruwé 24
Procédure et circuit de patrouilleLHC 8 secteur 10
Plans
September 4th 2007 M. Gruwé 25
Circuit de patrouilleLHC 8 secteur 10Liste de contrôle
EIS:□ □ Porte de secteur YCPS01=UW85
□ □ Porte de secteur YCPS02=UW85
Circuit de patrouille:□ Niveau 1 : Regarder derrière le rack au fond du local
□ Niveau 1 : Boîte de patrouille YZBPB01=UW85
□ Niveau 0 : Regarder dans la fosse au fond du local
□ Niveau 0 : Faire le tour du local
□ Niveau 0 : Boîte de patrouille YZBPA01=UW85
□ Niveau 0 : Boîte de patrouille YZBPA02=UW85
September 4th 2007 M. Gruwé 26
Validation of patrol procedure (I)
• In situ:– Identify and list hidden places, hiding places, holes, trapdoors, etc… – Design of a patrol circuit– Take pictures (access, peculiarities, etc…)
• Patrol circuit documents (for each sector):– Write down steps of patrol procedure
• How many people required for the patrol team• Tools required• Circuit itself (order, direction)• Search boxes to be rearmed• Places to be careful about
– Draw circuit on maps, including waiting points:• When there is a split, one patrol member searches the area the other patrol
member waits at the split to insure that no-one can go from a non-searched area to the already searched area.
September 4th 2007 M. Gruwé 27
Validation of patrol procedure (II)
• Simulation of patrol:– In collaboration with TS (access team)– Build patrol teams:
• OP members for the machine side• Experiment members for the experimental area• + People from the LHC access project (TS-CSE)
– Close one LHC point– Patrol the full zone (all sectors) in realistic conditions,
based on the document– Debriefing: comments from patrol team members
September 4th 2007 M. Gruwé 28
Validation of patrol procedure (III)
• Improvement of the patrol circuit documents– Based on experience from simulation of patrol and
comments from patrol team
• Possibly new simulation (if required) • Validation by DSO and group leader
September 4th 2007 M. Gruwé 29
Training
• Training and qualification of patrol members:– How to rearm patrol boxes?– How to rearm emergency exit systems?– Training on site– Patrol members should know the area inside out
• Hiding places• Holes• Ladders• Trapdoors
September 4th 2007 M. Gruwé 30
Status (I)
• LHC 7 and 8:– Circuits for machine sectors ready– Simulation of patrol for both points done (16/08/2007)
including LHCb– Some corrections and improvements included– Patrol circuit of machine sectors to be validated by
DSO soon.
• LHC 1, LHC 2 and LHC 3:– Circuits for machine sectors being written down. First
draft ready.
September 4th 2007 M. Gruwé 31
Status (II)
• LHC 4, LHC 5 and LHC 6:– Sometime in October
• Experiments:– Do you need help? Feel free to ask.– There will be a simulation of patrol for LHC 2 soon:
would be nice to do a full closure of LHC 2 and therefore include ALICE.