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Mo99_FACL_OPER_TN_0329_B: Dose Assessment
Revision: B Effective Date: 25/05/2016
Approved by: ANM Program Director Custodian: ANM Project Quality Co-ordinator
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ANM MO99 PROJECT
Mo99_FACL_OPER_TN_0329_B: Dose Assessment
May 2016
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Mo99_FACL_OPER_TN_0329_B: Dose Assessment Page 1 of 27
Revision: B Effective Date: 25/05/2016
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Revision Details Print name, date and initial each box
Rev. Letter
Description of Revision Prepared Reviewed Approved Agreed
A Initial Issue
B Updated to address SAC comments
Notes: 1. Revision shall be verified in accordance with the Quality Plan for the project.
2. Revision to be agreed by the relevant Client.
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Table of Contents
1. Purpose .................................................................................................................................................... 3 2. Scope ....................................................................................................................................................... 3 3. Method ..................................................................................................................................................... 3
3.1. Task Identification .............................................................................................................................. 3 3.2. Dose Rates ........................................................................................................................................ 3 3.3. Individual and Collective Doses ......................................................................................................... 4
4. Results ..................................................................................................................................................... 5 5. Conclusion............................................................................................................................................... 6 6. Definitions................................................................................................................................................ 6 7. Records .................................................................................................................................................... 7 8. References ............................................................................................................................................... 7 Appendix A: Operations Staff Annual Dose Assessment ..................................................................... 8 Appendix B: Maintenance Annual Dose Assessment .......................................................................... 10 Appendix C: Health Physics Annual Dose Assessment ...................................................................... 15 Appendix D: Dispatch and Packaging Annual Dose Assessment ...................................................... 20 Appendix E: Waste Operations Annual Dose Assessment ................................................................. 21 Appendix F: Contractors Annual Dose Assessment ........................................................................... 22 Appendix G: Drivers Annual Dose Assessment ................................................................................... 24 Appendix H: QC Annual Dose Assessment .......................................................................................... 25 Appendix I: ANM Mo99 Ground Floor ...................................................................................................... 26 Appendix J: ANM Mo99 Basement ........................................................................................................ 27
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Mo99_FACL_OPER_TN_0329_B: Dose Assessment Page 3 of 27
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1. Purpose The purpose of this document is to report the results of the radiation dose assessment for workers at the ANM Mo99 facility. This radiation dose assessment is based on the detailed design of the facility. This dose assessment will be reviewed and updated accordingly during the construction, cold commissioning and hot commissioning as the operating and maintenance strategies are further refined for the ANM Mo99 facility.
2. Scope The scope of the radiation dose assessment presented in this document is for Operations workers performing routine operations, Maintenance workers performing routine maintenance and anticipated breakdown maintenance; Health Physics (HP) support workers; Quality Control (QC) workers, Dispatch and Packaging workers, Drivers, Waste Operations workers and Contractors.
This document describes the process followed and assumptions made in calculating the radiation doses for each of the worker groups listed above.
This document does not include dose assessments for long term maintenance activities. Long term maintenance activities will be subject to separate safety assessments with submissions to the Safety Assessment Committee (SAC) for approval, prior to the work being performed.
3. Method The Dose Assessment was made according to the following steps.
1. Identification of all tasks performed for routine operations and worker numbers.
2. Calculation of dose rates workers are exposed to during tasks for routine operations.
3. Estimate of times taken to perform tasks.
4. Calculation of doses to workers performing tasks during routine operations.
3.1. Task Identification
A working group was formed consisting of members from Radiation Protection Services (RPS), Systems Safety and Reliability (SS&R), current B54 Mo-99 operations and representatives from the ANM Mo-99 project team and the ANM Mo99 client.
Initial meetings were held between 20th and 29
th of January 2014 with members from the working
group which identified and recorded the following information.
Task performed,
Group performing the task,
Location where the task is performed,
Frequency of the task,
Number of people required to perform the task,
The time estimated to perform the task and
The number of staff proposed for each work group.
Further meetings were held on 29th May and 17
th July 2015, further refining the above, using
completed detailed design information.
3.2. Dose Rates
Wherever possible, modelling was performed to obtain results which actually reflect the geometry of the exposure situation, taking into account contributions from all significant source terms. This has resulted in dose rates being calculated for anticipated worker positions while performing tasks which are more likely to be encountered during the operation of the ANM Mo99 facility.
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Where dose rate modelling is not available, a conservative approach was taken for dose rates used for this dose assessment and are based on the following criteria:
Shielding design objective and contact dose rates, and,
Conservative general area dose rates based on operational experience from similar activities at ANSTO.
The doses calculated for these tasks are considered to be bounding.
Separate dose assessments had previously been performed for a number of tasks and work groups from the current Mo-99 operations. These tasks are the loading of the B(U) container and QC operations. The doses calculated from these assessments have been used in place of a dose rate and time calculation.
The dose assessment for the drivers is only the dose attributable to loading and delivering Mo99 manufactured at the ANM Mo99 facility. It assumes that all Mo99 produced is for export and is also considered conservative. This dose does not include exposures from the transport of other radiopharmaceuticals.
3.3. Individual and Collective Doses
The method used to estimate the average individual and collective dose to workers was as follows.
Each workgroup was considered separately.
For each work group, the annual dose per task was calculated by multiplying the dose rate, time taken, number of people required and the annual frequency together.
For each workgroup, the annual collective dose was calculated by summing the annual task doses.
For each work group, the average individual dose was calculated by dividing the annual collective dose for the work group by the proposed number of workers within that work group.
Note that there is no average individual dose calculation for the contractor group, as there are a range of different contractors, and the number of individuals from each firm cannot be established at this time. A collective dose for contractors has been included instead.
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4. Results A summary of the annual dose assessment results is displayed in Table 1.
Table 1
Routine Maintenance 2268 756
Breakdown Maintenance 1157 386
TOTAL 3425 1142
Routine Operations 393 197
Routine Maintenance 1015 508
Breakdown Maintenance 159 79
TOTAL 1567 783
Routine Operations 34
Routine Maintenance 738.05
Breakdown Maintenance 1.2
TOTAL 773.25
**The annual collective dose for the drivers is the exposure due to ANM operations only.
It assumes that all Mo99 is export product, is transported by ANSTO, and does not take into account the
delivery of other radiopharmaceuticals manufactured by ANSTO.
Average Individual
Annual Dose (µSv)Task Sub-Type
23Routine Operations 19225 836
Contractors
Worker Group
Maintenance
Annual Collective
Dose (person µSv)
Number of
Workers in Group
3
Dispatch and
Packaging
Waste Operations
4
2Routine Operations
Routine Operations 6885
Routine Operations 84210100
Operations
Health Physics
Quality Control
1721
1452
2
12
726
**Drivers Routine Operations 3156 4 789
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5. Conclusion The results of this dose assessment is intended as a guide for the potential exposures workers are expected to receive for the routine operations of the ANM Mo-99 facility. This dose assessment is considered to be the upper bounding case for exposures workers could receive.
Actual doses to workers are expected to be lower during routine operations as some conservative assumptions have been made for these calculations. Some of these conservative assumptions are:
Conservative general area dose rates based on operational experience from similar activities at ANSTO,
Shielding design objective and contact dose rates used for some exposure calculations,
Times taken to perform tasks,
The doses to the Operations, Maintenance, Dispatch and Packaging, Health Physics, Waste Operations and QC worker groups indicate that expected average individual doses are below ANSTO’s ALARA objective of 2mSv/yr. Any further dose reductions are not considered justified from an economic perspective. Further dose reductions over the life of the plant would not be achievable through the justifiable monetary amount determined through cost-benefit analysis in the ALARA process.
The dose assessment for the drivers is only the dose attributable to loading and delivering Mo99 manufactured at the ANM Mo99 facility. It assumes that all Mo99 produced is for export and this result is also considered conservative and bounding. This dose does not include exposures from the transport of other radiopharmaceuticals.
For the 2009 to 2014 period, the maximum individual dose ranged between 3.44mSv and 5.01mSv for ANSTO Health Drivers. The average individual dose for this same period ranged between 2.68mSv and 3.46mSv. These dose results are due to the loading and delivery of all ANSTO Health produced radiopharmaceuticals. It is anticipated that the driver doses could potentially increase by an average of 0.79mSv/yr during ANM Mo99 operations, should the same number of delivery drivers be used. The ANM project is committed to further investigate increasing the amount of shielding currently installed in the delivery vans, to further reduce exposures to drivers. This will be confirmed by the Operational Readiness team prior to operation.
All anticipated exposures at the ANM Mo99 facility are well below ANSTO’s annual dose constraint of 15mSv/yr and the annual regulatory limit of 20mSv/yr.
The dose assessment described in this document will be reviewed and updated accordingly during the construction, cold commissioning and hot commissioning as the operating and maintenance strategies are further refined for the ANM Mo99 facility.
6. Definitions
Term Definition
ANM ANSTO Nuclear Medicine
Mo-99 Molybdenum 99
SAC Safety Assessment Committee
QC Quality Control
RPS Radiation Protection Services
HP Health Physics
SUF Spent Uranium Filter
B(U) Type ‘B’ Transport Package
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Mo99_FACL_OPER_TN_0329_B: Dose Assessment Page 7 of 27
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7. Records A paper copy is kept on: File number: ADM100421
Electronic records are kept in:
P:\eng_capex_projects\Molybdenum 3000 Facility\04 Regulatory\ARPANSA Submissions\05 Regulation 54s\Dose Assessment\2015 revision\
N:\Divisions\safety\projects\op0036\RP Project Support\ANM Mo99\
8. References Alam, M. Mills, B. 2015. ANM Mo99 Source Terms and Geometry of Sources for the Shielding
Basis of Hot Cells, Waste System and Facility Design - Mo99_FACL_CELL_TN_0154G. : ANSTO, 2015.
Jones, W. Barton, R. 2014. Safety Review of the Basement Shielding in the ANM Mo99 Facility – ANSTO/T/TN/2013-22 rev 1. : ANSTO, 2014.
Penny, C. 2014. Safety Review of the Concrete Hot Cell Shielding in the ANM Mo99 Facility – ANSTO/T/TN/2013-27 rev 1. : ANSTO, 2014.
Jones, W. Penny, C. 2014. Safety Review of the Lead Hot Cell Shielding in the ANM Mo99 Facility – ANSTO/T/TN/2013-26 rev 1. : ANSTO, 2014.
Penny, C. 2015. Safety Review of the ANM Mo99 Facility Liquid Waste System Shielding– ANSTO/T/TN/2013-23 rev 1. : ANSTO, 2015.
Jones, W. Penny, C. 2014. Safety Review of the Ground Floor Shielding in the ANM Mo99 Facility – ANSTO/T/TN/2014-17 rev 0. : ANSTO, 2014.
Jones, W. Penny, C. 2015. Safety Review of Flasks, Doors and other Shielding in the ANM Mo99 Facility – ANSTO/T/TN/2015-06 rev 0. : ANSTO, 2015.
WATPAC Construction. AECOM. Graham Bell Bowman Architects. ANSTO ANM Mo99 - Floor Plan – Basement Level – MO99_FACL_ARCH_ED_2310 rev F. : ANSTO, 2014.
WATPAC Construction. AECOM. Graham Bell Bowman Architects. ANSTO ANM Mo99 - Floor Plan – Ground Level – MO99_FACL_ARCH_ED_2311 rev G. : ANSTO, 2014.
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Appendix A: Operations Staff Annual Dose Assessment
Type Task Area Frequency (per year)
# workers for task
time required (hrs)
dose rate (µSv/hr)
dose rate comments
total dose per
year (µSv)
OPS Change over valve Pump room B007 1 1 0.5 4.4 4.4µSv/h @ 1m with
side wall of gas delay tanks
2.2
OPS Cell face operations
during production run
Cell Face 0024
Dissolver Cell Face 1 1 2162 1.85
1.85µSv/h @ 0.5m, cell face
manipulator operations
3999.7
Purification Cell Face
1 1 822.5 0.6
0.54µSv/h @ 0.5m, cell face
manipulator operations
493.5
Evaporation Cell Face
1 1 470 0.1
0.022µSv/h @ 0.5m, cell face
manipulator operations
47.0
Dispensing Cell Face
1 1 235 0.1
0.016µSv/h @ 0.5m, cell face
manipulator operations
23.5
Packaging Cell Face
1 1 705 0.1
0.016µSv/h @ 0.5m, cell face
manipulator operations
70.5
Room 0024 away from cell face
1 1 3290 0.25
Cell face operator not at cell face.
Position assumed at rear of room 0024 with average dose rate of 0.25µSv/h
822.5
OPS
All other cell face operations (such as
operator input during flask/movements)
Cell Face 0024 1 2 2162 0.25
other two operators, during a
batch run in dissolver
1081.0
OPS Remove and Replace
product dispenser equipment
Dispensing Hotcell
0.3 1 8 0.5 Ambient dose rate in the front of cell
1.2
0.3 2 0.5 3
Dose rate to the PADIRAC operator in the rear of cells, following decay of the equipment in
the waste cells
0.9
OPS General routine
operations at rear cell area
Rear of cells
1 2 132 3 Average dose rate 0.5m from rear of
cells - dissolver 792.0
1 2 264 0.5 Average dose rate 0.5m from rear of cells - other cells
264.0
1 2 1320 1 Average dose rate 2.0m from rear of
cells - dissolver 2640.0
1 2 6204 0.5 Average dose rate
at 2m rear of cells - other cells
6204.0
OPS SUF cup movements in
PADIRAC Rear of cells 75 2 0.1 8
8 µSv/h @ 1m on the side of the
PADIRAC 120.0
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OPS
Target flask movements (inc. tie
down and drive from OPAL)
Rear of cells 450 1 0.1 5 Contact dose rate
with flask 225.0
Rear of cells 450 1 0.5 0.5 Dose rate at 1m 112.5
OPS Transfer of retention
sample to storage cabinet
Rear of cells 48 2 0.25 1 Average dose rate 2.0m from rear of
cells 24.0
OPS Decontaminate hotcell
equipment Active
maintenance- 26 330 1 0.1 10
10µSv/h ambient dose rate during
decontamination of equipment
330.0
OPS Service and clean
hotcell process tanks Active
maintenance- 26 6 1 2 10
10µSv/h ambient dose rate at
operator 120.0
OPS Clean process flasks Active
maintenance- 26 48 1 1 10
10µSv/h ambient dose rate at
operator 480.0
OPS Rebuild Evaporation
equipment Active
maintenance- 26 4 1 1 10
10µSv/h ambient dose rate at
operator 40.0
OPS Rebuild Bursting Discs Active
maintenance- 26 4 1 3 10
10µSv/h ambient dose rate at
operator 120.0
OPS Rebuild in-cell
peristaltic pumps Active
maintenance- 26 12 1 1 10
10µSv/h ambient dose rate at
operator 120.0
OPS Service air-ejectors Active
maintenance- 26 1 1 1 10
10µSv/h ambient dose rate at
operator 10.0
OPS Service dispensing
equipment Active
maintenance- 26 0.3 1 3 10
10µSv/h ambient dose rate at
operator 9.0
OPS Service hot cell DPTE
doors Active
maintenance- 26 10 1 0.5 10
10µSv/h ambient dose rate at
operator 50.0
OPS Rebuild Hydrogen
Converters Active
maintenance- 26 0.2 1 35 10
10µSv/h ambient dose rate at
operator 70.0
OPS Service Vacuum
Pumps Active
maintenance- 26 0.5 1 4 10
10µSv/h ambient dose rate at
operator 20.0
OPS Clean PADIRAC
containers Active
maintenance- 26 48 1 0.5 10
10µSv/h ambient dose rate at
operator 240.0
OPS SS &EW testing Active
maintenance- 26 48 1 1 0.5
General ambient dose rate
24.0
OPS Sample Cell operations
Sample cell 0036 12 1 1 1.7 Contact dose rate from liquid waste
sample cell 20.4
OPS SyMo transfer Sample cell 0036 4 1 0.5 1.7 Contact dose rate from liquid waste
sample cell 3.4
OPS Feeding containers
thru to despatch Container
handling 0043 330 1 1 0.5
General ambient dose rate
165.0
OPS Placement of items Blue waste 0035 48 1 1 10 10µSv/h @ contact 480.0
Total Collective
Dose Ops 19225
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Appendix B: Maintenance Annual Dose Assessment
Type Task Area Frequency (per year)
# workers for task
time required (hrs)
dose rate (µSv/hr)
dose rate comments
total dose per
year (uSv)
RM Radiation monitor
calibration (2 In-cell, 1 room)
Sample cell 0036 1 1 0.5 0.5 Dose rate @ 0.5m
from front of liquid waste sample cell
0.3
RM 10 pressure sensors
for calibration / change out
Sample cell 0036 1 1 5 0.5 Dose rate @ 0.5m
from front of liquid waste sample cell
2.5
RM Vacuum pump maintenance
Sample cell 0036 1 1 2 0.5 Dose rate @ 0.5m
from front of liquid waste sample cell
1.0
RM
Liquid level gauge system maintenance (demister, pressure sensors, silica trap)
Sample cell 0036 1 1 2 0.5 Dose rate @ 0.5m
from front of liquid waste sample cell
1.0
RM Valve acutator
maintenance (46) Sample cell 0036 2 1 0.5 0.8
Dose rate @ 0.5m from top of liquid waste sample cell
0.8
RM Sample Cell
maintenance Sample cell 0036 1 1 1 0.5
Dose rate @ 0.5m from front of liquid waste sample cell
0.5
RM Pulsair system maintenance
Sample cell 0036 1 1 1 0.5 Dose rate @ 0.5m
from front of liquid waste sample cell
0.5
RM Decayed part
movement (for decontamination)
Rear of cells 48 2 0.5 1 Average dose rate 2.0m from rear of
cells 48.0
RM Ball valve
maintenance Rear of cells 0.3 1 0.5 3
Dose rate at 0.5m from dissolver hot
cell roof. 0.5
RM Service Padirac Door
and table system Rear of cells 96 1 0.5 3
Dose rate at 0.5m from rear of
dissolver hot cell. 144.0
RM Calibrate Instruments (sampling, DP's, dose
monitors) Rear of cells 1 1 8 1
Average dose rate 2.0m from rear of
cells 8.0
RM Change cell lighting Rear of cells 0.5 1 8 5 Dose rate at contact
with rear of dissolver hot cell.
20.0
RM Service Padirac Flasks
(e.g. door rollers) Rear of cells 12 1 1 1
Average dose rate 2.0m from rear of
cells 12.0
RM Floor access hatch Rear of cells 2 1 0.5 1 Average dose rate 2.0m from rear of
cells 1.0
RM Rad monitor
calibration in change areas
Changeroom (0010, 0020, 0037, 0042 &
0045)
1 1 2.5 0.5 General ambient
back ground 1.3
RM Calibrate instruments Cell exchange
M1015 1 1 16 2.5
Dose rate 1.0m from top of
dissolver hot cell 40.0
RM Service pumps (10) Cell exchange
M1015 2 1 2 2.5
Dose rate 1.0m from top of
dissolver hot cell 10.0
RM Hot water baths Cell exchange
M1015 1 1 3 2.5
Dose rate 1.0m from top of
dissolver hot cell 7.5
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RM
routine maintenance (roller door, DB, FH, radiation monitor
calibrations, instrument
calibrations)
Truck Airlock B001
1 2 8 0.5 Dose rate 1.0m
from carbon column wall
8.0
RM
Changing carbon filters (8- but only 4
changed each 5 years) and HEPA's (2, with
one changed)
Active Vent Filter Rooms- B004 &
B005 0.2 1 8 10.6
Dose rate 10.6µSv/h 2m from B004/B005
dividing wall 17.0
RM Testing of Hepa filters
(2)- smoke filter integrity etc
Active Vent Filter Rooms- B004 &
B005 0.5 2 4 10.6
Dose rate 10.6µSv/h 2m from B004/B005
dividing wall 42.4
RM Pressure Transmitters
changeover (for calibration)
Carbon column area- B006
3 2 0.5 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006 (0.14µSv/h) and 2.5m DR from Gas Delay Tanks
B012 (1.86µSv/h) in the Access Corridor
B013.
6.0
RM Replace Vacuum Pump Pump room B007 4 1 1 4.4 4.4µSv/h @1m from B012 dividing wall
17.6
RM Replace Demister Pump room B007 2 1 0.5 4.4 4.4µSv/h @1m from B012 dividing wall
4.4
RM Replace Solenoid
Valve Pump room B007 2 2 0.5 4.4
4.4µSv/h @1m from B012 dividing wall
8.8
RM Replace flow switch Pump room B007 1 2 0.5 4.4 4.4µSv/h @1m from B012 dividing wall
4.4
RM
Calibrate Instruments (2 flow swithces, 3
level sensors, area rad monitor)
Pump room B007 1 2 8 4.4 4.4µSv/h @1m from B012 dividing wall
70.4
RM Radiation detector &
pump maintenance (2) Corridor B013 2 1 1 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006 (0.14µSv/h) and 2.5m DR from Gas Delay Tanks
B012 (1.86µSv/h) in the Access Corridor
B013.
4.0
RM RH and Temp sensor
maintenance (3) Corridor B013 3 1 0.5 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006 (0.14µSv/h) and 2.5m DR from Gas Delay Tanks
B012 (1.86µSv/h) in the Access Corridor
B013.
3.0
RM Calibration of
instruments (P & T sensors- 12)
Corridor B013 1 2 6 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006 (0.14µSv/h) and 2.5m DR from Gas Delay Tanks
B012 (1.86µSv/h) in the Access Corridor
B013.
24.0
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RM Change Tank Outlet
Valve (168) Corridor B013 1 2 1 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006 (0.03µSv/h) and 0.5m DR from Gas Delay Tanks
B012 (8.7µSv/h) in the Access Corridor
B013.
17.5
RM Change Tank Inlet
Valve (168) Corridor B013 1 2 1 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006 (0.03µSv/h) and 0.5m DR from Gas Delay Tanks
B012 (8.7µSv/h) in the Access Corridor
B013.
17.5
RM Calibrating Pressure
Transmitter (84) Corridor B013 84 1 1 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006 (0.03µSv/h) and 0.5m DR from Gas Delay Tanks
B012 (8.7µSv/h) in the Access Corridor
B013.
733.3
RM Change of SIAM filters
(2) Pump & Tank Room B015
0.2 2 2 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take place
in B015, ILLW and LLLW inventories
will be cleared and flushed repeatedly until a sufficiently low dose rate is
achieved.
40.0
RM
Calibrations (2 SIAM Rad Monitors, diff
pressure transmitter, temp transmitter, Area monitor, air
sampler)
Pump & Tank Room B015
1 1 8 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take place
in B015, ILLW and LLLW inventories
will be cleared and flushed repeatedly until a sufficiently low dose rate is
achieved.
400.0
RM Calibrating Hydrogen
transmitter, Pump & Tank Room B015
2 1 2 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take place
in B015, ILLW and LLLW inventories
will be cleared and flushed repeatedly until a sufficiently low dose rate is
achieved.
200.0
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RM Calibration- Holding
tank pressure indicator
Pump & Tank Room B015
1 1 4 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take place
in B015, ILLW and LLLW inventories
will be cleared and flushed repeatedly until a sufficiently low dose rate is
achieved.
200.0
RM Change out the
check/pressure relief valve (15)
Pump & Tank Room B015
1 1 2.5 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take place
in B015, ILLW and LLLW inventories
will be cleared and flushed repeatedly until a sufficiently low dose rate is
achieved.
125.0
RM Safety shower testing 52 1 0.5 1 <1µSv/h ambient
dose rate 26.0
2268
BM Maintenance of
motorised valves- 6
Active Vent Filter Rooms- B004 &
B005 0.2 2 4 10.6
Dose rate 10.6µSv/h 2m from B004/B005
dividing wall 17.0
BM Change solenoids
(336) Corridor B013 3 2 0.5 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006 (0.03µSv/h) and 0.5m DR from Gas Delay Tanks
B012 (8.7µSv/h) in the Access Corridor
B013.
26.2
BM Change Pressure Transmitter (84)
Corridor B013 0.5 2 0.5 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006 (0.03µSv/h) and 0.5m DR from Gas Delay Tanks
B012 (8.7µSv/h) in the Access Corridor
B013.
4.4
BM Change PT (Pressure
Transmitter) electronics
Corridor B013 3 1 2 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006 (0.03µSv/h) and 0.5m DR from Gas Delay Tanks
B012 (8.7µSv/h) in the Access Corridor
B013.
52.4
BM Change
solenoids/actuators Pump & Tank Room B015
1 1 0.5 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take place
in B015, ILLW and LLLW inventories
will be cleared and flushed repeatedly until a sufficiently low dose rate is
achieved.
25.0
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BM Replacement of
manips (MT200's)
Front of cells 12 2 1 10 At operator position 240.0
Front of cells 12 2 0.15 200 Near penetration 720.0
BM Replacement of other
manips Front of cells 12 2 1 3 3µSv/h @ contact 72.0
1157
Total Collective
Dose Maintenance 3425
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Appendix C: Health Physics Annual Dose Assessment
Type Task Area Frequency (per year)
# workers for task
time required (hrs)
dose rate (µSv/hr)
dose rate comments
total dose per
year (uSv)
OPS / HP
Routine Surveys and clearances
Rear of cells 48 1 2 1 Average dose rate 2.0m from rear of
cells 96
OPS / HP
Routine Surveys and clearances
Front of cells 48 1 2 0.5 Average general
Ambient dose rate 48
OPS / HP
Routine Surveys and clearances
General facility 48 1 2 0.5 Average general
Ambient dose rate 48
OPS / HP
Front of Cells general Front of cells 1 1 400 0.5 Average general
Ambient dose rate 200
OPS / HP
Change over valve Pump Room B007 1 1 0.2 4.4 4.4µSv/h @1m from
B012 dividing wall 0.88
OPS / HP
Remove and Replace product dispenser
equip Dispensing Hotcell 0.3 1 1 0.5
0.5µSv/h @ contact with rear of cell
0.15
393
RM / HP
Sample Cell maintenance
Sample cell 0036 1 1 1 5
Dose rate 0.5m from valve
enclosure and valve handles
5
RM / HP
Crane maintenance (monthly)
Rear of cells 12 1 0.5 1 Average dose rate 2.0m from rear of
cells 6
RM / HP
Ball valve maintenance
Rear of cells 0.3 1 0.25 3.5 Dose rate at 0.5m from dissolver hot
cell roof. 0.2625
RM / HP
Changing carbon filters (8- but only 4
changed each 5 years) and HEPA's (2, with
one changed)
Active Vent Filter Rooms- B004 &
B005 0.2 1 4 10.6
Dose rate 10.6µSv/h 2m from B004/B005
dividing wall 8.48
RM / HP
Testing of Hepa filters (2)- smoke filter
integrity etc
Active Vent Filter Rooms- B004 &
B005 0.5 1 2 10.6
Dose rate 10.6µSv/h 2m from B004/B005
dividing wall 10.6
RM / HP
Doors- Chain block & pulley inspection
Outside B004 & B005
1 1 0.5 39 38.96µSv/h @ contact with wall/door.
19.5
RM / HP
Pressure Transmitters changeover (for
calibration)
Carbon column area- B006
3 1 0.25 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006
(0.14µSv/h) and 2.5m DR from Gas Delay Tanks B012 (1.86µSv/h) in the
Access Corridor B013.
1.5
RM / HP
Cooling coils maintenance (1)
Carbon column area- B006
1 1 0.5 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006
(0.14µSv/h) and 2.5m DR from Gas Delay Tanks B012 (1.86µSv/h) in the
Access Corridor B013.
1
RM / HP
Monorail, crane & chain block
inspections (4)
Carbon column area- B006
1 1 0.25 12.45 Dose rate at 0.5m 3.1
RM / HP
Replace Vacuum Pump
Pump Room B007 4 1 1 4.4 4.4µSv/h @1m from
B012 dividing wall 17.6
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RM / HP
Replace Demister Pump Room B007 2 1 0.5 4.4 4.4µSv/h @1m from
B012 dividing wall 4.4
RM / HP
Replace Solenoid Valve
Pump Room B007 2 1 0.5 4.4 4.4µSv/h @1m from
B012 dividing wall 4.4
RM / HP
Replace flow switch Pump Room B007 1 1 0.5 4.4 4.4µSv/h @1m from
B012 dividing wall 2.2
RM / HP
Calibrate Instruments (2 flow swithces, 3
level sensors, area rad monitor)
Pump Room B007 1 1 0.5 4.4 4.4µSv/h @1m from
B012 dividing wall 2.2
RM / HP
Radiation detector & pump maintenance (2)
Corridor B013 2 1 0.5 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006
(0.14µSv/h) and 2.5m DR from Gas Delay Tanks B012 (1.86µSv/h) in the
Access Corridor B013.
2
RM / HP
RH and Temp sensor maintenance (3)
Corridor B013 3 1 0.25 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006
(0.14µSv/h) and 2.5m DR from Gas Delay Tanks B012 (1.86µSv/h) in the
Access Corridor B013.
1.5
RM / HP
Calibration of instruments (P & T
sensors- 12) Corridor B013 1 1 3 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006
(0.14µSv/h) and 2.5m DR from Gas Delay Tanks B012 (1.86µSv/h) in the
Access Corridor B013.
6
RM / HP
Change Tank Outlet Valve (168)
Corridor B013 1 1 0.5 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006
(0.03µSv/h) and 0.5m DR from Gas Delay Tanks B012 (8.7µSv/h) in the Access Corridor
B013.
4.365
RM / HP
Change Tank Inlet Valve (168)
Corridor B013 1 1 0.5 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006
(0.03µSv/h) and 0.5m DR from Gas Delay Tanks B012 (8.7µSv/h) in the Access Corridor
B013.
4.365
UNCLASSIFIED
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RM / HP
Calibrating Pressure Transmitter (84)
Corridor B013 84 1 0.5 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006
(0.03µSv/h) and 0.5m DR from Gas Delay Tanks B012 (8.7µSv/h) in the Access Corridor
B013.
366.66
RM / HP
Change of SIAM filters (2)
Pump & Tank Room B015
0.2 1 1 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take
place in B015, ILLW and LLLW
inventories will be cleared and flushed repeatedly until a
sufficiently low dose rate is achieved.
10
RM / HP
Calibrations (2 SIAM Rad Monitors, diff
pressure transmitter, temp transmitter, Area monitor, air
sampler)
Pump & Tank Room B015
1 1 4 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take
place in B015, ILLW and LLLW
inventories will be cleared and flushed repeatedly until a
sufficiently low dose rate is achieved.
200
RM / HP
Calibrating Hydrogen transmitter,
Pump & Tank Room B015
2 1 1 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take
place in B015, ILLW and LLLW
inventories will be cleared and flushed repeatedly until a
sufficiently low dose rate is achieved.
100
RM / HP
Calibration- Holding tank pressure
indicator
Pump & Tank Room B015
1 1 2 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take
place in B015, ILLW and LLLW
inventories will be cleared and flushed repeatedly until a
sufficiently low dose rate is achieved.
100
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RM / HP
Change out the check/pressure relief
valve (15)
Pump & Tank Room B015
1 1 1.25 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take
place in B015, ILLW and LLLW
inventories will be cleared and flushed repeatedly until a
sufficiently low dose rate is achieved.
62.5
RM / HP
Inspection of crane rails
Pump & Tank Room B015
1 1 0.25 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take
place in B015, ILLW and LLLW
inventories will be cleared and flushed repeatedly until a
sufficiently low dose rate is achieved.
12.5
RM / HP
Safety shower testing 52 1 1 1 <1µSv/h ambient
dose rate 52
RM / HP
Calibrating fire detectors (too all basement rooms)
All Basement Rooms
1 1 2 3.5
Dose rate is sum of 1.5m DR from
Carbon Column Wall B006
(0.05µSv/h) and 1.5m DR from Gas Delay Tanks B012 (3.4µSv/h) in the Access Corridor
B013.
7
1015
BM / HP
Maintenance of motorised valves- 6
Active Vent Filter Rooms- B004 &
B005 0.2 1 2 10.6
Dose rate 10.6µSv/h 2m from B004/B005
dividing wall 4.24
BM / HP
Change solenoids (336)
Corridor B013 3 1 0.25 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006
(0.03µSv/h) and 0.5m DR from Gas Delay Tanks B012 (8.7µSv/h) in the Access Corridor
B013.
6.5475
BM / HP
Change Pressure Transmitter (84)
Corridor B013 0.5 1 0.25 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006
(0.03µSv/h) and 0.5m DR from Gas Delay Tanks B012 (8.7µSv/h) in the Access Corridor
B013.
1.09125
BM / HP
Change PT (Pressure Transmitter) electronics
B013 Corridor 3 1 1 8.73
Dose rate is sum of 2.5m DR from
Carbon Column Wall B006
(0.03µSv/h) and 0.5m DR from Gas Delay Tanks B012 (8.7µSv/h) in the Access Corridor
B013.
26.19
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BM / HP
Change solenoids/actuators
Pump & Tank Room B015
1 1 0.25 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take
place in B015, ILLW and LLLW
inventories will be cleared and flushed repeatedly until a
sufficiently low dose rate is achieved.
12.5
BM / HP
Replacement of manips (MT200's)
Front of cells 12 1 0.75 10 Dose rate at HP
position 90
BM / HP
Replacement of other manips
Front of cells 12 1 0.5 3 Dose rate at HP
position 18
BM / HP
Swipe access testing & maintenance
Exit doors in corridor
0.1 1 0.5 3.5
Dose rate is sum of 1.5m DR from
Carbon Column Wall B006
(0.05µSv/h) and 1.5m DR from Gas Delay Tanks B012 (3.4µSv/h) in the Access Corridor
B013.
0.175
159
Total Collective
Dose HP 1567
UNCLASSIFIED
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Appendix D: Dispatch and Packaging Annual Dose Assessment
Type Task Area Frequency (per year)
# workers for task
time required (hrs)
dose rate (µSv/hr)
dose rate comments
total dose per
year (uSv)
OPS Smear Test
Cell face area and Dispatch and
Packaging. 765 1
Dose based on assessment of
packing B(U) in IHB. 765 x 9 =
6885µSv/yr
6885
OPS Move trolley to leak
test area
OPS Perform leak test
OPS Transfer to despatch
OPS assemble final
container
OPS lid tensioning
OPS transport index and
final smear test
Total Collective Dose Dispatch and
Packaging 6885
UNCLASSIFIED
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Appendix E: Waste Operations Annual Dose Assessment
Type Task Area Frequency (per year)
# workers for task
time required (hrs)
dose rate (µSv/hr)
dose rate comments
total dose per
year (uSv)
OPS Taking SUF flask off
truck Truck Airlock
B001 52 2 0.5 0.5
Dose rate 1.0m from carbon column
wall 26
OPS flask onto waste cell, transfer of SUF cups
into flask
Ground floor cell area- rear of cells
52 2 0.5 2 0.5m dose rate with rear of ILSW hot cell
104
Ground floor cell area- front of cells
52 2 0.5 1.5 0.5m dose rate with
front of ILSW hot cell
78
OPS SUF flask onto truck -
contact period Truck Airlock
B001 52 2 0.1 25 15 weeks decay 260
OPS SUF flask onto truck Truck Airlock
B001 52 2 0.5 0.5
Dose rate 1.0m from carbon column
wall 26
OPS Taking Retievable
waste flask flask off truck
Truck Airlock B001
72.8 2 0.5 0.5 Dose rate 1.0m
from carbon column wall
36.4
OPS flask onto waste cell,
transfer of retrievable waste into flask
Ground floor cell area- rear of cells
72.8 2 0.5 1 General ambient rear of cells dose
rate 72.8
OPS Ground floor cell
area- front of cells 72.8 2 0.5 0.50
General ambient front of LLSW cells
dose rate. 36.4
OPS Retrievable waste flask onto truck -
contact period
Truck Airlock B001
4 2 0.1 67 AG Columns 53.6
OPS Retrievable waste flask onto truck -
contact period
Truck Airlock B001
68.8 2 0.1 50 All other waste 688
OPS Retrievable waste
flask onto truck Truck Airlock
B001 72.8 2 0.5 0.5
Dose rate 1.0m from carbon column
wall 36.4
RM
Changing carbon filters (8- but only 4
changed each 5 years) and HEPA's (2, with
one changed)
Active Vent Filter Rooms- B004 &
B005 0.2 2 8 10.6
Dose rate 10.6µSv/h 2m from B004/B005
dividing wall 33.92
Total Collective Dose Waste Ops
1452
UNCLASSIFIED
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Appendix F: Contractors Annual Dose Assessment
Type Task Area Frequency (per year)
# workers for task
time required (hrs)
dose rate (µSv/hr)
dose rate comments
total dose per
year (uSv)
Ops Crane maintenance
(yearly) Rear of cells 1 2 5 1
Average dose rate 2.0m from rear of
cells 10
Ops Girder trolley servicing Active
maintenance- 26 1 2 0.5 10 10 @ contact 10
Ops Powered conveyor
inspection & maintenance
Container handling 0043
2 2 3 1 3 @ contact 12
Ops Crane inspection Container
handling 0043 4 1 0.5 1 3 @ contact 2
34
RM Calibrating fire
detectors (too all basement rooms)
All basement rooms
1 2 4 3.5
Dose rate is sum of 1.5m DR from
Carbon Column Wall B006 (0.05µSv/h) and 1.5m DR from Gas Delay Tanks
B012 (3.4µSv/h) in the Access Corridor
B013.
28
RM Inspection of crane
rails Pump & Tank Room B015
12 2 0.5 50
50µSv/hr design objective used. This area is not normally
occupied and if work is to take place
in B015, ILLW and LLLW inventories
will be cleared and flushed repeatedly until a sufficiently low dose rate is
achieved.
600
RM Cooling coils
maintenance (1) Carbon column
area- B006 1 2 1 2
Dose rate is sum of 0.5m DR from
Carbon Column Wall B006 (0.14µSv/h) and 2.5m DR from Gas Delay Tanks
B012 (1.86µSv/h) in the Access Corridor
B013.
4
RM Monorail, crane &
chain block inspections (4)
Carbon column area- B006
1 2 0.5 12.45 Dose rate at 0.5m 12.45
RM Doors- Chain block &
pulley inspection Outside B004 &
B005 1 2 1 8.8
Contact DR with AVS room door
17.6
RM Crane maintenance
(monthly) Rear of cells 11 2 1 1
Average dose rate 2.0m from rear of
cells 22
RM SS / EW testing Rear of cells 48 2 0.5 1 Average dose rate 2.0m from rear of
cells 48
RM High bay light changes Rear of cells 0.5 2 2 1 Average dose rate 2.0m from rear of
cells 2
RM Fire detection system Rear of cells 1 2 1 1 Average dose rate 2.0m from rear of
cells 2
UNCLASSIFIED
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RM Scissor lift servicing Rear of cells 1 2 1 1 Average dose rate 2.0m from rear of
cells 2
738.05
BM Swipe access testing &
maintenance Exit doors in
corridor 0.1 2 1 6
DR down centre of Corridor B013
1.2
1.2
Total Collective
Dose Contractors 773.25
UNCLASSIFIED
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Appendix G: Drivers Annual Dose Assessment A conservative approach was taken and it was assumed that the total yield from all Mo99 production was to be export Mo99.
In order to estimate the increase in exposure to drivers from the loading and delivery of export Mo99 from the ANM Mo99 Facility, first an exposure per activity delivered ratio was calculated based on 2014 export Mo99 activity delivered and driver EPD dosimetry data.
The total weekly yield from the ANM Mo99 Facility is taken as 3000Ci/week, 6 day calibration. This was extrapolated to an annual yield by multiplying by 52 weeks/year.
To estimate the total collective exposure to the drivers for the delivery of export Mo99 from the ANM Mo99 Facility, the ANM Mo99 annual yield was divided by the exposure per activity delivered ratio.
B54 Exposure (µSv)
Activity Delivered (TBq)
Activity per unit exposure (TBq/µSv)
19 157.648 8.30
ANM (6 day Cal) Annual, Calibrated Activity (TBq)
Annual, Yield Activity (TBq)
Annual Collective Dose (µSv)
5772.00 26189.01 3156
Annual Collective Dose (µSv) 3156
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Appendix H: QC Annual Dose Assessment In order to estimate the annual collective dose for ANM QC workers, an extrapolation of the average of the 2014 and 2015 annual collective doses, due to the increase in QC work and total activity handled, was performed. For the 2014 and 2015 calendar years, the average annual collective dose for the Mo99 QC group was 4.85man mSv. This exposure is due to QC performing analysis 4 times per week with an initial QC sample size of 5GBq. Total activity handled per week is 20GBq. Production at ANM will be a maximum of 10 runs per week with QC performing analysis a maximum of 8 times per week as 2 production runs will be combined when samples are sent to QC. The maximum sample size that will be sent to ANM QC will be 2.7 GBq. Total activity handled per week will be 21.6GBq. In order to estimate the potential exposure to the the QC group during the operation of ANM, the following assumptions were made:
A 100% increase in the collective dose for QC analysts from the increase in number of runs from 4 to 8.
An additional 8% increase on current collective dose for QC analysts due to the increase in total activity handled from 20GBq to 21.6GBq.
The expected maximum annual collective dose for the QC worker group is calculated to be 10.1mSv. The ANM project has indicated that 12 workers will make up the QC work group. This results in an average annual individual dose of 842µSv. This value is considered very conservative as it does not take into account any potential dose reductions due to improvements which are being implemented in the B2 QC lab.
UNCLASSIFIED
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Appendix I: ANM Mo99 Ground Floor
UNCLASSIFIED
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Appendix J: ANM Mo99 Basement
End of Document