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Radiation Protection aspects LSS1 - TAN region. Cristina Adorisio (CERN - DGS/RP). Outline. Residual dose rate measurements Last TS (June 25 th , 2012) Evolution of activation Prediction for Xmas technical stop and LS1 Work-Dose Plan LHCf reinstallation during Xmas technical stop - PowerPoint PPT Presentation
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RADIATION PROTECTION ASPECTSLSS1 - TAN REGIONCristina Adorisio (CERN - DGS/RP)
2
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
13
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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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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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