RADIATION PROTECTION ASPECTSLSS1 - TAN REGIONCristina Adorisio (CERN - DGS/RP)

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OUTLINE

Residual dose rate measurements Last TS (June 25th, 2012)

Evolution of activation Prediction for Xmas technical stop and LS1

Work-Dose Plan LHCf reinstallation during Xmas technical stop ATLAS ZDC reinstallation during Xmas technical stop

AFP installation region estimation TCL5 collimator activation

Conclusions

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TAN- LSS1L

SIDE 1 (côté tunnel):10µSv/h SIDE 3 : 38µSv/h

SIDE 2 : 16µSv/h

TOP 1 : 27µSV/h

TOP 2 : 5µSv/h

TOP 3 :10µSv/h

TOP 4 : 12µSV/h

TOP 6 : 16 µSV/hTOP 7 : 44µSv/h

SIDE 3 : 39 µSv/h

SIDE 19µSV/h

TOP 5 : 12µSv/h

Thanks to: A. Herve (CERN DGS/RP) RP measurements done on June 25 th 2012All values at contact

TAN- LSS1R

TOP 615µSv/h

TOP 510µSv/h

TOP 412µSv/h

TOP 2 : 9µSv/h

SIDE 3 : 35 µSv/h

SIDE 1 : 11 µSv/h

TOP 1 : 77µSv/h

(*)

TOP 3 : 8µSv/h

SIDE 2 : 16µSv/h (*)

TOP 727µSv/h

Thanks to: A. Herve (CERN DGS/RP) RP measurements done on June 25 th 2012All values at contact

SIDE 1: 13µSv/h SIDE 3: 54µSv/h

SIDE 2: 14µSv/h

TOP 1: 63µSv/h

TOP 2: 18µSv/h

TOP 4: 24µSv/h

TOP 7: 50µSv/h

TOP 3: 28µSv/h

TOP 5: 20µSv/h

TOP 6: 26µSv/h

TAN- LSS5LThanks to: A. Herve (CERN DGS/RP) RP measurements done on June 25 th 2012

All values at contact

TOP 7: 50µSv/h

TOP 6: 30µSv/hTOP 5: 30µSv/h

TOP 4: 22µSv/h

TOP 2: 19µSv/h

SIDE 3: 95µSv/hSIDE 1: 13µSv/h

SIDE 2 (*): 16µSv/h

TOP 1: 48µSv/h

(*)

TOP 3: 22µSv/h

TAN- LSS5RThanks to: A. Herve (CERN DGS/RP) RP measurements done on June 25 th 2012

All values at contact

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2TS#2 SURVEY MEASUREMENTSSUMMARY

TS#2June 25th, 2012

- 1 week of cooling

TAN LSS1 Left Right

Top 1 27 77

Top 2 5 9

Top 3 10 8

Top 4 12 12

Top 5 12 10

Top 6 16 15

Top 7 44 27

Side 1 10 11

Side 2 16 16

Side 3 39 35

Residual dose rate on contact (mSv/h)

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2EVOLUTION OF ACTIVATION The measurements could be used to estimate the residual dose rate during the TS in 2012

and the LS1

Referring to June 2012 detailed measurements done on TANs, the scaling factors is: 1.35 for Xmas TS 2012 → essentially driven by the peak luminosity

Referring to Feb. 2012 detailed measurements done on TANs and on the detectors, the scaling factors is:

3 for LS1 → essentially driven by the integrated luminosity

TAN LSS1(max values)

Xmas TSFebruary 2012

~ 3 months cooling(mSv/h)

TS#2June 25th, 2012

~ 1 week of cooling(mSv/h)

Xmas TSDecember,

2012~ 1 week cooling(mSv/h)

LS1April, 2013~ 3 months

cooling(mSv/h)

top 10 77 105 30

side 6 39 53 18

Aisle @40cm from the TAN

- 3.5 (1day c.t.) 2.8 -

Aisle @1m from the TAN

- 1.8 (1day c.t.) 1.4 -measurements extrapolations

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LHCf RE-INSTALLATION – XMAS TS

Operation

Time(min

)

Required Personne

lPosition

Individual Dose(mSv)

Collective Dose

(mSv)

-2Bring downstairs the detectors and

the tooling needed for the

installation

10 2 physicists from LHCf PM15-> UL16 0 0

-1Bring downstairs

electrical cupboard, camera

and desktop20 2 operators

from EN/HE PM15-> UL16 0 0

0 Radiation Survey 15 1 technician DGS/RP

UJ16/TAN 13 13

1Prepare/check mini-cranes for

operation45 2 operators

from EN/HETAN and between TAN

and UJ16 6 12

2 Bring the shielding box 10 2 operators

from EN/HEBunker in UJ17 ->TAN 0 0

3 Bring the detector to the TAN 5 2 physicists

from LHCfUJ17 -> TAN 0 0

4Remove Cu bar

and place it in the appropriate

shielding box10 2 operators

from EN/HE

UJ16Behind the shielding

wall0 0

5 Install detector 10 2 operators from EN/HE

UJ16Behind the shielding

wall0 0

6 Remove bar shielding box 10 2 operators

from EN/HETAN-> bunker in UJ17 0 0

7Remove electrical

cupboard and cameras from TAN

5 2 operators from EN/HE TAN 5 10

8Bring upstairs

electrical cupboard, camera

and desktop20 2 operators

from EN/HE UJ16 -> PM15 0 0

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1 week cooling time

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LHCf RE-INSTALLATION – XMAS TS

Operation

Time(min

)

Required Personne

lPosition

Individual Dose(mSv)

Collective Dose (mSv)

9 Screwing (no fine positioning) 15 2 physicists

from LHCfOn top of the TAN 26 52

10

Installation of the Front Counter 10 2 physicists

from LHCf

On top of the TAN and behind it on the

footbridge18 36

11

Cabling for preamp and FC 5 2 physicists

from LHCf

On top of the TAN and behind it on the

footbridge9 18

12

Additional cabling for the electronics

box 10 2 physicists

from LHCfOn top and side of the

TAN 18 36

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Survey 4 h 2 technicians from BE/ABP Around the TAN region 62 124

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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 15-60

min)

105 210

15

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

27 54

16

Bring back detector shielding

boxes10 1 physicists

from LHCf TAN->PM15 0 0

17

Exit the zone 10 2 physicists from LHCf TAN->PM15 0 0

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1 week cooling time

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LHCf RE-INSTALLATION – XMAS TS

Concerned Person Individual Dose (mSv)

1st LHCf physicist 158

2nd LHCf physicist 98

3rd LHCf physicist 150

DGS/RP technician 13

1st operator from EN/HE 11

2nd operator from EN/HE 11

1st operator from BE/ABP 62

2nd operator from BE/ABP 62

Collective Dose 565mSv

Summarizing (1 week cooling time):

The estimated dose are done considering the maximum dose rate at the position of the worker (TAN aisle, TAN top or side on contact).

The individual dose for two of the LHCf physicists falls into the ALARA level II.

Collective dose falls into ALARA level II.

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1 week cooling time

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2EVOLUTION OF ACTIVATION No MD before the Xmas TS

No MD also before TS#3 → relook at the estimations after the next TS

TAN LSS1(max

values)

TS#2June 25th,

2012~ 1 week of cooling

Xmas TSDecember,

2012~ 8 hours cooling

Xmas TSDecember,

2012~ 1 day cooling

Xmas TSDecember,

2012~ 1 week cooling

Xmas TSDecember,

2012~ 4 weeks

cooling

LS1April, 2013~ 3 months

cooling

top 77 273 179 105 61 33

side 39 138 90 53 31 18

Aisle @1m from the TAN

- 3.6 2.4 1.4 - -

measurements extrapolations

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LHCf RE-INSTALLATION – XMAS TS

Concerned Person Individual Dose (mSv)

1st LHCf physicist 269

2nd LHCf physicist 165

3rd LHCf physicist 254

DGS/RP technician 23

1st operator from EN/HE 17

2nd operator from EN/HE 17

1st operator from BE/ABP 105

2nd operator from BE/ABP 105

Collective Dose 955 mSv

Summarizing (1 DAY cooling time):

The estimated dose are done considering the maximum dose rate at the position of the worker (TAN aisle, TAN top or side on contact).

The individual dose for the LHCf physicists falls into the ALARA level II.

Collective dose falls into ALARA level II.

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1 DAY cooling time

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ATLA

S Z

DC

RE-I

NS

TALL

ATIO

N –

XM

AS T

S  Operation

Time (minutes)

Required Personnel

Position Individual

Dose (mSv)

Collective Dose (mSv)

0 Radiation Survey 15 1 technician DGS/RP UJ16/TAN side 13 13

1 Remove H3 PMT 5 1 physicist from ATLAS ZDC TAN passarelle 9 9

2Remove the remote

hadling bars and cover H1-pixel

15 1 physicist from ATLAS ZDC TAN passarelle 26 26

2   15 1 physicist from ATLAS ZDC TAN side 13 13

3Mount PMT H1, H2,

H3, EM and light tightening of PMT

30 1 physicist from ATLAS ZDC TAN passarelle 53 53

3   30 1 physicist from ATLAS ZDC TAN side 27 27

4Prepare and connect HV and signal cables

for EM, H1, H2, H310 1 physicist from

ATLAS ZDC TAN passarelle 18 0

4   10 1 physicist from ATLAS ZDC TAN side 9 0

5Mount H1-pixel front end electronics and connect signals and

HV cables

15 1 physicist from ATLAS ZDC TAN passarelle 26 0

5   15 1 physicist from ATLAS ZDC TAN side 13 0

6If needed remount

LED calibration system for HAD1 pixel

15 1 physicist from ATLAS ZDC TAN passarelle 26 26

6   15 1 physicist from ATLAS ZDC TAN side 13 13

7

Preparation laser optical fiber, connect optical splitter and connect it to the 4

PMT

15 1 physicist from ATLAS ZDC TAN passarelle 26 26

7   15 1 physicist from ATLAS ZDC TAN side 13 13

8Prepare cables to

connect to the NIM crate

10 2 physicists from ATLAS ZDC TAN side (bottom) 9 18

9Connect the NIM crate and all modules inside

to the cables30 2 physicists from

ATLAS ZDC TAN side (bottom) 27 54

10 Commissioning (8h) 120 2 physicists from ATLAS ZDC

Around the TAN if needed 3 6

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1 week cooling time

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ATLAS ZDC RE-INSTALLATION – XMAS TS

Concerned Person Individual Dose (mSv)

1st ATLAS ZDC physicist 223

2nd ATLAS ZDC physicist 127

DGS/RP technician 13

Collective Dose 363mSv

Summarizing (1 week cooling time):

The estimated dose are done considering the maximum dose rate at the position of the worker (TAN aisle, TAN top or side on contact).

The individual dose for the ATLAS ZDC physicists falls into the ALARA level II.

Transport part is the same as for LHCf detector (they will be transported together/at the same moment).

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1 week cooling time

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ATLAS ZDC RE-INSTALLATION – XMAS TS

Concerned Person Individual Dose (mSv)

1st ATLAS ZDC physicist 380

2nd ATLAS ZDC physicist 217

DGS/RP technician 23

Collective Dose 620 mSv

Summarizing ( 1 day cooling time):

The estimated dose are done considering the maximum dose rate at the position of the worker (TAN aisle, TAN top or side on contact).

The individual dose for the ATLAS ZDC physicists falls into the ALARA level II.

Collective dose falls into ALARA level II.

Transport part is the same as for LHCf detector (they will be transported together/at the same moment).

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1 DAY cooling time

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TCL5 ACTIVATIONLT

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LSS1

TS#2June 25th,

2012~ 1 week of

cooling

Xmas TSDecember,

2012~ 1 week cooling

Xmas TS December,

2015~ 1 week cooling

Xmas TS December,

2015~ 1 month

cooling

TCL.5L1.B2 1020 1377 9100 5300

TCL.5R1.B1 1300 1755 11600 6800

Residual dose rate on contact (mSv/h)

measurements extrapolations

Extrapolation to 2015 is done considering: the energy difference (3.5TeV to 6.5TeV) a max peak luminosity of 2.2∙1034cm-2s-1

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CONCLUSIONS

The estimation for the Xmas TS are done considering 1 week cooling time

Some estimation for shorter cooling time (1 day) considering the absence of the MD before the Xmas TS

The estimation for the LS1 are done considering 3 months cooling time

All the estimations will be updated/reviewed using the survey measurements which will be done during next technical stop TS#3

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THANK YOUFOR YOUR ATTENTION!

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2ALARA

Optimization is a legal requirement if accumulated individual dose exceeds 100 μSv/year (ALARA)

Optimization includes

• work coordination• work procedures• handling tools• design • material

requiredoptional