patrolling the lhc m. gruwé ab-op lemic september 4 th 2007

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


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.


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.


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


Sectors (example)

Point LHC 8

LHCb


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


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


Search boxes

Associated to a sector door:

Simple search box:


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


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…


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


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


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”


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


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


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


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)


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



Plans

• Vue d’ensemble: POINT8 accès via SD8• Surface : SD8• Accès : US85 secteur 1• Circuit: UW85



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) :



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.



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.



Plans


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


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.


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


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


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


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.


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.