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Radiation Protection aspects LSS1/5 TANs

Radiation Protection aspects LSS1/5 TANs. Cristina Adorisio, Kurt Weiss (CERN - DGS/RP). Outline. Residual dose rate measurements February 2012 (Xmas Shutdown): TAN+ZDC detector Evolution of activation Prediction for 2012 and LS1 Conclusions. Thanks to: K. Weiss (CERN DGS/RP).

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Radiation Protection aspects LSS1/5 TANs

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  1. Radiation Protection aspectsLSS1/5 TANs Cristina Adorisio, Kurt Weiss (CERN - DGS/RP)

  2. Outline • Residual dose rate measurements • February 2012 (Xmas Shutdown): TAN+ZDC detector • Evolution of activation • Prediction for 2012 and LS1 • Conclusions LTEX Meeting, 5 April 2012

  3. Thanks to: K. Weiss (CERN DGS/RP) TAN- LSS1L RP measurements done on February 1st 2012 All values at contact 6.4µSv/h 1.5µSv/h 6.3µSv/h 5.4µSv/h 155µSv/h @ vacuum chamber 6.7µSv/h 1.2µSv/h 5µSv/h 2.1µSv/h 585µSv/h @ vacuum chamber 879µSv/h @ vacuum chamber

  4. Thanks to: K. Weiss (CERN DGS/RP) CR-001617 CR-001616 CR-001615 CR-001618 TREC identifiers To IP1 To ARC 3 5 2 4 1 Values measuredafterremoval of the ZDC, at the bottom of the TAN crack 550 µSv/h 450 µSv/h 603 µSv/h 500 µSv/h 125 µSv/h 1.6 µSv/h 2 µSv/h (back) 2.6 µSv/h 1.6 µSv/h 2.6 µSv/h (left) 1.3 µSv/h (right) 1.7 µSv/h 5 1.3 µSv/h (front) 2 1 3 180 µSv/h 200 µSv/h 80 µSv/h 460 µSv/h 180 µSv/h 370 µSv/h 440 µSv/h 70 µSv/h@10cm 13 µSv/h@40cm 320 µSv/h 170 µSv/h 300 µSv/h 310 µSv/h 270 µSv/h 330 µSv/h 215 µSv/h 150 µSv/h 245 µSv/h

  5. Thanks to: K. Weiss (CERN DGS/RP) TAN- LSS1R RP measurements done on Febuar 17th 2012 All values at contact 5µSv/h 1.6µSv/h (*) 6µSv/h 6µSv/h 2.7µSv/h 1.6µSv/h 4µSv/h 10µSv/h 84µSv/h @vacuum chamber 438µSv/h @ vacuum chamber 1.7µSv/h (*)

  6. Thanks to: K. Weiss (CERN DGS/RP) CR-001670 CR-001669 CR-001668 CR-001667 TREC identifiers To ARC To IP1 3 5 2 4 1 Values measuredafterremoval of the ZDC, at the bottom of the TAN crack 77µSv/h 312 µSv/h 423 µSv/h 360 µSv/h 450 µSv/h 1.3 µSv/h 2.0 µSv/h 1.3 µSv/h 1.6 µSv/h 2.2 µSv/h (back) 1.7 µSv/h 2.0 µSv/h 1.7 µSv/h 1 µSv/h 1.6 µSv/h (left) 1.6 µSv/h (right) 1.7 µSv/h 1.7 µSv/h 1.7 µSv/h 5 1.6 µSv/h (front) 1.4 µSv/h 3 1 4 144 µSv/h 260 µSv/h 180 µSv/h 270 µSv/h 180 µSv/h 220 µSv/h 320 µSv/h 34 µSv/h@10cm 5 µSv/h@40cm 310 µSv/h 150 µSv/h 107 µSv/h 90 µSv/h 230 µSv/h 270 µSv/h 300 µSv/h 180 µSv/h 180 µSv/h

  7. Thanks to: K. Weiss (CERN DGS/RP) RP measurements done on February 6th 2012 All values at contact TAN- LSS5L 1.4µSv/h 540µSv/h @ buttom of crack 8µSv/h 8µSv/h 1.3µSv/h 3.3µSv/h 9µSv/h 8µSv/h 2.1µSv/h

  8. Thanks to: K. Weiss (CERN DGS/RP) RP measurements done on February 6th 2012 All values at contact ZDC detector (5L) To IP5 To ARC 3 2 1 Values measuredafterremoval of the ZDC, at the bottom of the TAN crack 590 µSv/h 340 µSv/h 340 µSv/h 340 µSv/h 140 µSv/h 3 µSv/h (back) 3 µSv/h (back) 2 µSv/h (back) 3 µSv/h (front) 2 µSv/h (front) 3 2 µSv/h (front) 1 150 µSv/h 100 µSv/h @ sides 520 µSv/h (back) 200 µSv/h (back) 180 µSv/h (back) 90 µSv/h 100 µSv/h @ side 270 µSv/h (front) 130 µSv/h (front) 130 µSv/h (front)

  9. Thanks to: K. Weiss (CERN DGS/RP) TAN- LSS5R RP measurements done on February 6th 2012 All values at contact 9.5µSv/h 0.5µSv/h (*) 8µSv/h 11.5µSv/h 4µSv/h 1.5µSv/h 8µSv/h 8.3µSv/h 573µSv/h @ buttom of crack 1.7µSv/h (*)

  10. Evolution of activation • The measurements could be used to estimate the residual dose rate during the TS in 2012 and the LS1 • Referring to Feb. 2012 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 LTEX Meeting, 5 April 2012 Source: M. Lamont

  11. Future situation – 2012 TS4 and LS1 Residual dose rate (maximum values) on contact (mSv/h) LTEX Meeting, 5 April 2012 • Higher values are expected for the Cu/SS bars

  12. E ABCD Future situation – LHC nominal M. Fuerstner et al., EDMS 1006918 • Calculation done considering 109 7 TeV pp/s for 180 days • (~1 year @ nominal beam energy and intensity) LTEX Meeting, 5 April 2012

  13. Future situation – LHC nominal ~ 0.6 mSv/h ~ 0.2 mSv/h • Calculation done considering 109 7 TeV pp/s for 180 days are very conservative, scaling the results to a more realistic scenario: LTEX Meeting, 5 April 2012

  14. Conclusions • The residual dose rate measurements show • No differences from L to R • Comparable values in IR5 and in IR1 • ZDC detectors values confirm the need of a remote handling tool also in IR5 to manage the exchange ZDC/bars • 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 is 8 times higher than in Feb. 2012 • The residual dose rate in LS1 (3 months of cooling) is 3 times higher than in the last Xmas stop LTEX Meeting, 5 April 2012

  15. Thank Youfor your attention!

  16. ALARA Optimization is a legal requirement if accumulated individual dose exceeds 100 μSv/year (ALARA) LTEX Meeting, 5 April 2012 • Optimization includes • work coordination • work procedures • handling tools • design • material required optional

  17. Work Planning At present, sharepoint-based RP tool for work approval In future directly linked to the overall LHC work planning approval and access permission tools LTEX Meeting, 5 April 2012

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