R ADIATION P ROTECTION ASPECTS LSS1 LHC f RE - INSTALLATION Cristina Adorisio (CERN - DGS/RP) LTEX Meeting – May 10 th, 2012

O UTLINE Residual dose rate measurements Xmas Shutdown (February 2012) TS# (April 25th) Evolution of activation Prediction for 2012 and LS1 Work-Dose Plan LHCf reinstallation during TS#4 Conclusions 2 LTEX Meeting - May 10 th, 2012

TAN- LSS1L 1.5µSv/h 6.3µSv/h 2.1µSv/h 5µSv/h 1.2µSv/h 6.7µSv/h 6.4µSv/h 5.4µSv/h vacuum chamber vacuum vacuum chamber Thanks to: K. Weiss (CERN DGS/RP)

TAN- LSS1R 4µSv/h 2.7µSv/h 6µSv/h 1.6µSv/h 5µSv/h 1.6µSv/h 1.7µSv/h (*) 10µSv/h (*) vacuum chamber chamber Thanks to: K. Weiss (CERN DGS/RP) 4LTEX Meeting - May 10th, 2012

TAN- LSS1L 3.6 µSv/h (côté tunnel) 5 µSv/h dessus) 12.5 µSv/h 4.5 µSv/h 13 µSv/h 3.5 µSv/h 5 µSv/h 6 µSv/h 12 µSv/h 17.5 µSv/h 12.5 µSv/h 8 µSv/h 3.6 µSv/h Thanks to: A. Herve (CERN DGS/RP)

TAN- LSS1R 17 µSv/h (dessous) 10.5 µSv/h (dessus) 4.7 µSv/h 4.8 µSv/h 5.6 µSv/h 5 µSv/h 24.5 µSv/h (milieu côté tunnel) 6 µSv/h 4 µSv/h (*) 20 µSv/h (*) 4.2 µSv/h Survey réalisé le 25/04/12 à 14h00 Thanks to: A. Herve (CERN DGS/RP) 6LTEX Meeting - May 10th, 2012

7 E VOLUTION OF ACTIVATION Year of operation Number of days physics Energy (TeV) Fraction of nominal beam intensity 13%50% Number of bunches Peak luminosity (cm -2 s -1 ) 1.0× × ×10 33 Integrated luminosity (fb -1 ) Source: M. Lamont The measurements could be used to estimate the residual dose rate during the TS in 2012 and the LS1 Referring to Feb detailed measurements done on TANs and on the detectors, the scaling factors are: 8 for 2012 TS4 (Oct. 2012) → essentially driven by the peak luminosity (factor of 2 with respect to the last TS in 2011) and derived from the different cooling time (factor 4 from 3 months cooling time to 1 week cooling time) 3 for LS1 → essentially driven by the integrated luminosity

8 LTEX Meeting - May 10 th, 2012 F UTURE SITUATION – 2012 TS4 AND LS1 Residual dose rate (maximum values) on contact (  Sv/h) → Higher values are expected for the Cu/SS bars

9 LTEX Meeting - May 10 th, 2012 LHCf RE - INSTALLATION – TS4 Operation Time (min) Required Personnel Position Individual Dose (  Sv) Collective Dose (  Sv) -2 Bring downstairs the detectors and the tooling needed for the installation 10 2 physicists from LHCf PM15-> UL16 00 Bring downstairs electrical cupboard, camera and desktop 20 2 operators from EN/HE PM15-> UL Radiation Survey 15 1 technician DGS/RP UJ16/TAN 12 1 Prepare/check mini- cranes for operation 45 2 operators from EN/HE TAN and between TAN and UJ Bring the shielding box 10 2 operators from EN/HE Bunker in UJ17 ->TAN 24 3 Bring the detector to the TAN 5 2 physicists from LHCf UJ17 -> TAN 12 4 Remove Cu bar and place it in the appropriate shielding box 10 2 operators from EN/HE UJ16 Behind the shielding wall 00 5 Install detector 10 2 operators from EN/HE UJ16 Behind the shielding wall 00 6 Remove bar shielding box 10 2 operators from EN/HE TAN-> bunker in UJ Remove electrical cupboard and cameras from TAN 5 2 operators from EN/HE TAN 48 8 Bring upstairs electrical cupboard, camera and desktop 20 2 operators from EN/HE UJ16 -> PM15 00

10 LTEX Meeting - May 10 th, 2012 LHCf RE - INSTALLATION – TS4 Operation Time (min) Required Personnel Position Individual Dose (  Sv) Collective Dose (  Sv) 9 Screwing (no fine positioning) 15 2 physicists from LHCf On top of the TAN Installation of the Front Counter 10 2 physicists from LHCf On top of the TAN and behind it on the footbridge Cabling for preamp and FC 5 2 physicists from LHCf On top of the TAN and behind it on the footbridge Additional cabling for the electronics box 10 2 physicists from LHCf On top and side of the TAN Survey 4 h 2 technicians from BE/ABP Around the TAN region ?? 14 Electronics commissioning (8 h) 60 2 physicists from LHCf This test is performed from USA15. In case of problems 2 physicists from LHCf will have to work on top of the TAN for a period which depends on the kind of problem (typically min) Mechanical commissioning (manipulator) ( 8 h ) 30 2 physicists from LHCf Test performed mainly from USA15. One physicist is required to stay on top of the TAN for 30 minutes maximum Bring back detector shielding boxes 10 1 physicists from LHCf TAN->PM Exit the zone 10 2 physicists from LHCf TAN->PM15 00

11 LTEX Meeting - May 10 th, 2012 LHCf RE - INSTALLATION – TS4 Concerned Person Individual Dose (  Sv) 1 st LHCf physicist134 2 nd LHCf physicist175 DGS/RP technician12 1 st operator from EN/HE20 2 nd operator from EN/HE20 1 st operator from BE/ABP? 2 nd operator from BE/ABP? Collective Dose 361  Sv + 2 x ? Summarizing: The estimated dose are done considering the maximum dose rate the position of the worker (TAN aisle, TAN top or side). The doses for the BE/ABP operators are missing (need to be understood what “ around the TAN region ” means)

C ONCLUSIONS The residual dose rate measurements show Comparable values between L and R The evolution of the activation can be estimated Based on the simulation results Based on the evolution of the operational parameters The residual dose rate expected in the last TS in 2012 (TS#4) is 8 times higher than in Feb Individual and Collective doses are calculated using the job plan provided by LTEX coordination team and the estimated residual dose rate for the TS#4 (conservative values are taken into account) the Work and Dose Planning has to be prepared by the experiment people - that really knows the procedure - with RP helping and advising 12 LTEX Meeting - May 10 th, 2012

T HANK Y OU FOR YOUR ATTENTION !

14 LTEX Meeting - May 10th, 2012 ALARA Optimization is a legal requirement if accumulated individual dose exceeds 100 μSv/year (ALARA) Optimization includes work coordination work procedures handling tools design material required optional

15 LTEX Meeting - May 10th, 2012 W ORK P LANNING At present, sharepoint-based RP tool for work approval In future directly linked to the overall LHC work planning approval and access permission tools