K. Foraz & Perrot A. L., EN/MEF - R2E Project
LMC 25th May 2011
Thanks toEN/EL, EN/HE, EN/MEF, equipment ownersthe LHC integration team & the R2E team
SEE upsets in collimator controlMitigation options
- 1rst May 2011: SEU in UJ14 collimation control rack -> beam dump(see presentation of Markus in LMC 4th May)
- 5th May 2011: emergency action plan request
- May 2011: SEU in UJ14/16 cryogenics SEU in UJ14/16 biometry ; SEU in others areas (see RADWG for details)
LMC, 25 May 2011, A. L. Perrot 1
QPS
PIC
collimation
current leads heaters
BPM
cryogenics
UJ14/16 racks layout
R2E events
TODAY
UL16
UJ16
Courtesy A. Tursun, Y. Muttoni
transport reserved volume
PC
PC spare
Symmetrical layout in UJ14
Mitigation options
4 mitigation options can be considered
Option # 0: full relocation + shielding activities during 7 months for 10 groups
Option # 1: relocate only the 2 collimation racks
Option # 2: relocate all the racks except the Power Converters
Option # 3: shielding
Duration & sequence optimized with Katy, EN/EL & EN/HE
LMC, 25 May 2011, A. L. Perrot 2
Option 1- collimation racks relocation
Time estimation per side
EN/EL 7 days activityEN/STI 10 days activity
Total= 15 days
Work anticipation in a Technical Stop Phase I: EL (cables + optical fibers) 5 days during 1 TSPhase II: EL (cables connection), EN/STI 12 days emergency or
Christmas break
Advantage: EL manpower available for other activities during ‘Christmas break’
Group
Activity Duration [days]
EN/EL racks disconnection 1 cable trays installation 1 pull cables 1
connection // optical fibers 2
EN/STI racks displacement 5 commissioning
Partial equipment relocation not an effective R2E approach
LMC, 25 May 2011, A. L. Perrot 3
Time estimation for both sides
Option 2 – UJ14/16 racks relocation
TODAY
UL16UJ16
Courtesy A. Tursun, Y. Muttoni
transport reserved volume
exclusion area
PC
QPS
PIC
collimation
current leads heaters
BPM
PC spare
cryogenics(profibus-> moves FIP -> stays)
CYCIP01 + DYPG02DYPG01
TYCFL01
QYC01
QYC02
RYSC01
RYLC01RYLB01
RYMCB01RYMCB02RYMCB03RYMCB04
RQX.R1RTQX2.R1
RYMCC01
RYCA01RYCA02
UL16 after relocation
Relocation 6 racks /side(without power converters)
5 groups impacted
LMC, 25 May 2011, A. L. Perrot 4
Courtesy P. Orlandi, JC Guillaume
UJ14/16 racks layout
‘crash program for EN/EL’possible manpower issue for the other activities
LMC, 25 May 2011, A. L. Perrot 5
Group activity Duration [week]
EN/EL 11 Equipment owners (without TE/EPC) 7 displacement commissioning TOTAL 18
Option 2 – UJ14/16 racks relocation
Christmas break 2011-2012: 11 weeks activities in tunnel
co-activity
Conclusion:not possible to relocate the 12 racks during next Christmas break
Study under progress
Fluence decrease by factor8-30
Option 3 - Shielding
Location Weight [t] Blocks # Bars # Delivery @ CERN
RB16 60 85 mid-July 2011UJ16 190 500 1400 Nov 2011UJ17 300 250 Nov 2011
TOTAL /2 sides 1100 1670 2800
Courtesy F.Delsaux
LMC, 25 May 2011, A. L. Perrot 6
UL16
UJ16
UJ17
RB16
After relocation & shielding
Courtesy JP Corso
UJ16
UJ17
RB16
Shielding installation in RB16
Courtesy F.Delsaux
L shielding= 28 m
Parallel activitiesEmpty He liquid in 1 sectorDepressurize the triplet He line(discussed with Safety)
Time estimation for both sides
Activity Duration [week]
Preparatory work 1 MAD removal Survey motors removal Tablotins' (AUG, siren, red phones, anti-panic lightning) Shielding installation (*) 4 2 shifts Rehabilitation work 1 MAD reinstallation test safety equipments
TOTAL 6(*) if chicane replaced by a ‘plug’ -> 2 additional weeks
Option 3 - Shielding
EN/HE: manpower effort
Conclusion: shielding installation could be scheduled for next Christmas break
LMC, 25 May 2011, A. L. Perrot 7
ALARA : installation during Christmas break (residual dose rate along the triplets)
Fluence decrease by factor7-10
Courtesy K. Foraz, M. Brugger & R2E simulation team
Option Mitigation action work duration [weeks]
Fluence decrease factor
Option 0 full relocation + shielding 30 40 to 100 (**)Option 2 12 racks relocated into UL 18 (*) 8 to 30 (**)Option 3 shielding + chicane (plug) 6 (8) 7 to 8 (8 to 10) (**)
Option2 +3 12 racks relocation into UL + shielding+ chicane 24 40 to 100 (**)
Options comparison
LMC, 25 May 2011, A. L. Perrot 8
General remark:co-activity not possible between shielding & relocation(~1000 transports of blocks are foreseen in each UL i.e. lift 4000 up/down)
(*) EN/EL ‘crash program’(**) depending of the location
Conclusions
LMC, 25 May 2011, A. L. Perrot 9
R2E proposals:- No independent equipment relocation unless clear impact
on LHC operation
- Shielding installation during next Christmas break (ALARA)
R2E monitors constantly radiation levels, failures & scenarios
‘R2E review’ in November: presentation/discussions of the optimization solutions
