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Table of Contents

Overview

This page describes the procedure for moving a Detector Tower underground from the SNOLAB warehouse to the SuperCDMS low radon cleanroom.  It is assumed that the tower is stored in a sealed Tower Storage Container that has been backfilled with nitrogen per the procedures in MP01, with the storage container mounted to the Tower Shipping Container and sealed in a wooden Tower Shipping Crate per the procedures in MP05.  This movement plan is divided into 3 phases: phase 0 describes preparatory work to be completed in advance of the move, phase 1 describes the move from the SNOLAB warehouse to the entrance of the car wash, and phase 2 describes the move through the car wash to the low radon cleanroom.

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The companion movement plan MP06: Tower Movement from B749 to SNOLAB describes movement of the towers from SLAC to the SNOLAB warehouse.  While MP06 follows the SLAC Enhanced Rigor Work Planning and Control protocol, this movement plan will follow SNOLAB protocol while preserving the enhanced rigor methodology where applicable.  The Tower Shipping Readiness Review will review both MP06 and MP07 procedures.

Procedure for Tower Movement from SNOLAB Surface to Low Radon Cleanroom

There are 3 distinct phases to this movement: Advance Preparations, Move from SNOLAB Warehouse to Car Wash Entrance, and Move from Car Wash Entrance to Low Radon Cleanroom.

Phase 0: Advance Preparations

The following action items shall be completed prior to Day 0 such that they are available when called out in the steps below. 

Material:

The following items are needed for this movement and shall be sourced or made available:

  • Detector Tower in Tower Storage Container, mounted on a Tower Shipping Container and sitting in a Tower Shipping Crate in B749 (photos 1, 2)
  • Pressure readout with power source (24V AC/AC transformer) and power wires for each tower
  • Small screwdriver for connecting/disconnecting the pressure readout power source
  • Laptop computer with MSR data logger software installed and a microSD card slot
  • Empty microSD card for each tower in card case
  • High tack adhesive tape (blue tape)
  • Plastic sheeting
  • Caution tape and warning signage
  • Impact driver with Phillips-head bit (car wash)
  • Pallet Jack (SLAC B81 and SNOLAB Warehouse)
  • Forklifts (SNOLAB surface, drifts, and underground lab)
  • A minimum of 6-8 cargo straps for securing shipping crate
  • 2 assembled transport carts and wheels Ready in the underground laboratory.
  • Ramp to allow the transport carts to be easily moved in/out of the low radon cleanroom.

Personnel

The following personnel are required for each day as outlined below. In many circumstances in the event of absence an alternate with similar authority, skills or knowledge can be substituted.

Specific people are identified, pending approval from SNOLAB operations management and scheduling availability.

Day 0 - Receive towers from FedEx
  • Surface forklift operator - Andrew Moss
  • Logistics supervisor (can serve as spotter) - Justin Cooper
  • Project coordinator (can serve as spotter) - Alex Claveau
  • SuperCDMS representatives - Richard Partridge, Tyler Reynolds, Ariel Reyes, Vijay Iyer, Ruslan Podviianiuk
Day 1 - Contingency day

To address delivery in event of delays or as needed:

  • Surface forklift operator - Andrew Moss
  • Logistics supervisor (can serve as spotter) - Justin Cooper
  • Project coordinator (can serve as spotter) - Alex Claveau
  • SuperCDMS representatives as deemed appropriate - Richard Partridge, Tyler Reynolds, Ariel Reyes, Vijay Iyer, Ruslan Podviianiuk
Day 2 - Move towers underground and into dirty side of car wash
  • Surface forklift operator - Andrew Moss
  • Underground forklift operator - Codey Pugliese
  • Logistics supervisor (can serve as spotter) - Justin Cooper
  • Project coordinator (can serve as spotter) - Alex Claveau
  • SuperCDMS representatives as deemed appropriate - Richard Partridge, Tyler Reynolds, Ariel Reyes, Vijay Iyer, Ruslan Podviianiuk
Day 3 - Process towers through car wash and move into low radon cleanroom
  • Clean room forklift operator - Steve Brunelle
  • Cleaning supervisor - Brenda Laurin
  • Integration supervisor - Kirk Risto
  • Project coordinator (can serve as spotter) - Alex Claveau
  • SuperCDMS representatives as deemed appropriate - Richard Partridge, Tyler Reynolds, Ariel Reyes, Vijay Iyer, Ruslan Podviianiuk
  • Cleaning support as deemed appropriate - TBD


Personal Protective Equipment

The following items will be provided and must be utilized at all times in compliance with SNOLAB, VALE and regulatory requirements.  SNOLAB document SL-MCS-EHS-90-001-P contains specifics around type, approval and governing policy if further guidance and information is required.

SNOLAB parking lot, SNOLAB surface building, VALE walkways, VALE Parking spaces
  • No PPE Requirement
  • Obey all signage and make use of pedestrian walkways and crossing lights
SNOLAB Surface Warehouse, Yard, VALE Yard, Headframe
  • Hard Hat with muff-type ear protection
  • Safety footwear with internal metatarsal guard
  • Safety glasses
  • Hi-Viz overalls or equivalent shirt and pants
  • Hand protection as required
VALE underground facilities including drift and cage, dirty side carwash
  • Hard Hat with muff-type ear protection
  • Safety footwear with internal metatarsal guard
  • Safety glasses
  • Hi-Viz overalls or equivalent shirt and pants
  • Hand protection as required
  • Approved safety belt
  • Cap lamp with at least 2 staff equipped with radio cap lamps
  • All backpacks must be marked with reflective tape to maintain integrity of reflective markings
SNOLAB underground lab facility
  • Clean room coveralls
  • Clean room hard-hat
  • Hair net
  • Clean room safety footwear (SNOLAB provided)
  • Hand protection as required
  • Ear protection as required
  • Safety glasses

Administrative and Planning Tasks

  • Complete all the advance preparations for Copy of MP06: Tower Movement from B749 to SNOLAB, including written permission from SNOLAB's Director of Operations to ensure SNOLAB is ready to receive the towers.
  • Scheduling of cage runs for 14MAY2023. One reserved time shall be 7AM-9AM and another shall be 11AM-1PM. Only 1 is intended to be used.
  • Scheduling with VALE such that no planned fire alarm tests occur during 14MAY2023.
  • Advising and planning for Day 0-2 activities with Logistics supervisor. Make final Staffing commitments for these activities.
  • Advising and scheduling Day 3 activities with Logistics and Integrations supervisors. Make final Staffing commitments for these activities.
  • Establish lines of communication for regular updates during shipping process.
  • Stage/ready surface forklift at end of Day 0 to be ready for movement during Day 2.
  • Identify an underground staging area near the shaft station.
  • Identify a surface staging area near the headframe.
  • Arrange for the drift forklift to be ready for use at the end of the Day 0 shift.
  • Arrange for the car wash storage area to be clear and accessible at the end of the Day 0 shift.

Phase 1: Move from SNOLAB Warehouse to Car Wash Entrance

This phase shall be exclusively contained in Day 2.

  1. Hold a tailgate meeting to go over the work plan, responsibilities, and areas of concern.  Obtain worker acknowledgement and work release.
  2. The underground forklift operator will be sent down to 6800L to travel to SNOLAB, inspect the forklift and bring it to the shaft station.
  3. Disconnect the pressure readout power wiring for the first Tower Shipping Crate at its source, keeping the power wiring connected to the pressure readout.
  4. Use high-tack tape to resecure the pressure readouts, MSR PowerPacks, and wiring to the shipping crate if necessary.
  5. If necessary use a pallet jack or the warehouse forklift to move the first Tower Shipping Crate to the pickup point for the surface forklift, taking care to minimize shocks during transport.  Stop work immediately if there is any risk that the tower could be dropped or damaged.  The shipping crates should not be slid across the floor.
  6. Bring the surface forklift (photo below) to the pickup point.  Engage the first Tower Shipping Crate on the surface forklift tines and lift the crate slightly off the ground.  Take care to minimize shocks and stop work immediately if there is any risk that the tower could be dropped or damaged.  The shipping crates should not be slid across the ground or floor.  Strap the crate so that it is secured to the forklift.  Some experimentation may be needed on the first crate to find an optimal strapping strategy, leading to modifications in the procedure proposed here:
    1. Loosely strap the crate to the mast to ensure the crate can't slip forward off the tines but not so tight that you slide the crate up against the mast.
    2. Install additional straps wrapped under the tines and over the top of the crate and tighten to ensure the crate can't tip over.  These straps should help hold the first set of straps in place.
  7. A second worker shall verify that the shipping crate is well secured to the forklift before proceeding to move the crate to Vale.
  8. Use the surface forklift to move the first crate from the warehouse entrance to the staging area near the shaft entrance, which is behind the tall blue tower in the photo below.    Most of the route is on a gravel roadway.  A spotter should walk ahead of the forklift to point out any hazards to be avoided (potholes, large rocks, etc.) and help guide the forklift in a path that will minimize shocks during transport.  Stop work immediately if there is any risk that the tower could be dropped or damaged.  The shipping crates should not be slid across the ground or floor.  Remove the straps before resting the crate on the floor of the staging area.
    1.  
  9. One member of the Day 2 team should keep watch on the crate. 
  10. Repeat steps 2-8 for the second tower if appropriate.
  11. When the cage is ready for loading, check that the cage is level with the floor and have the cage tender lock the cage in place.  Have a SNOLAB forklift driver move the crates one at a time onto the cage.  Detector towers shall be secured on one level and the other left for personnel. Secure the crates to the cage using cargo straps.  Take care to minimize shocks during transport.  Stop work immediately if there is any risk that the tower could be dropped or damaged.  The shipping crates should not be slid across the ground or floor.
  12. Once the crates are in position on the cage deck, the surface forklift operator should return the forklift to SNOLAB property and meet the team before descending (if applicable).
  13. A second worker shall verify that everything is in place to descend and that the cage operator is aware that we require a smooth and slow descent.  When both crates are loaded and we are ready to descend, have the cage tender signal the cage operator to begin the descent.
  14. Upon reaching the 6800' level, personnel should be off-loaded first.  The cage tender should then signal for the equipment deck to be brought into position for unloading.
  15. When the cage is ready for unloading, check that the cage is level with the floor and have the cage tender lock the cage in place.  Unfasten any straps that are used to secure the crates and have a SNOLAB forklift driver move both of the crates one at a time off the cage to the underground staging area.  Take care to minimize shocks during transport.  Stop work immediately if there is any risk that the tower could be dropped or damaged.  The shipping crates should not be slid across the ground or floor.
  16. Hold a tailgate meeting to go over the work plan, responsibilities, and areas of concern.  Obtain worker acknowledgement and work release.
  17. At least one member of the Day 2 team should keep watch on the second crate at the shaft station while the first crate is moved down the drift to the lab.
  18. Engage the first crate on the drift forklift tines and lift the crate slightly off the ground (the drift forklift is shown in the photo below).  Strap the crate so that it is secured to the forklift.  Some experimentation may be needed on the first crate to find an optimal strapping strategy, leading to modifications in the procedure proposed here:
    1. Loosely strap the crate to the mast to ensure the crate can't slip forward off the tines but not so tight that you slide the crate up against the mast.
    2. Install additional straps wrapped under the tines and over the top of the crate and tighten to ensure the crate can't tip over.  These straps should help hold the first set of straps in place.
  19. A second worker shall verify that the shipping crate is well secured to the forklift before proceeding to move the crate to the car wash entrance.
  20. Use the drift forklift to move the first crate from the shaft staging area to the dirty side car wash.  The forklift driver should keep one set of wheels on a rail track and the other set of wheels on the dirt floor on the other side of the tracks.  At least initially, having the right forklift wheels riding on the right rail appears to be the best choice since it is least affected by the rail switches.  Special care needs to be taken at the rail switches where the branching rail line creates an uneven surface that must be crossed. It may be helpful to change the switch position.  The forklift should drive slowly with a front and back spotter working to identify hazards and help keep the forklift riding with one set of wheels on the rail track.  Stop work immediately if there is any risk that the tower could be dropped or damaged.  The shipping crates should not be slid across the ground or floor.  Remove the straps before resting the crate on the floor of the dirty side carwash.
  21. Close and Cane the doors prior to leaving for the second crate to prevent unauthorized access to the lab and first detector crate
  22. Repeat steps 16-18 for the second crate if appropriate.
  23. Move the towers in etraveler to SNOLAB Underground once you are in a region where Wi-Fi connections are allowed.
  24. Connect power to the pressure transducers and record the storage container pressures on the Tower Storage Container page.
  25. Setup a double barricade using caution tape or chains along with appropriate signage to forbid access to the crates.
  26. Close out of the lab as appropriate, locking the door and caning the carwash doors.

Phase 2: Move from Car Wash Entrance to Low Radon Cleanroom

This phase shall begin on Day 3 and may extend as needed, as cosmogenic concerns no longer apply.

  1. Hold a tailgate meeting to go over the work plan, responsibilities, and areas of concern.  Make sure everyone understands how the towers are packaged and the terminology employed in this procedure (see below).  Obtain worker acknowledgement and work release.
    1. In the left photo the Tower Transport Cart is the flat bed stainless steel cart with 4 wheels used to move the tower within the underground laboratory; the Tower Shipping Container incorporates a 24"x40" plastic shipping pallet with five 1" thick Sorbothane feet mounted to the bottom of the pallet and a wire-rope shock isolation system mounted to the top of the pallet; the Tower Storage Container is the cylindrical container mounted on the shipping container that opens up at a middle flange; the Detector Tower is the critical detector assembly mounted to the lower half of the storage container (middle photo) and is hermetically sealed in the storage container using twelve bolts with silver plated nuts to compress the silicone gasket (right photo).  The pressure transducer and data logger are mounted on the top of the storage container.  The storage container is pressurized to 22 psia (4 psig at SNOLAB) with nitrogen boil-off gas to protect the tower from radon exposure.  The storage container must not be opened at any time during this move.
    2.      
    3. The wooden Tower Shipping Crate encloses the Tower Shipping Container and has 5 pockets in the floor of the crate that the Sorbothane feet rest in (left photo).  The Tower Storage Container is triple bagged (middle photo), with the outer two bags completely enclosing the Tower Shipping Container.  The inner bag stays clear of the forklift openings and is to remain attached throughout this move (right photo).
    4.        
  2. Record the storage container pressure for the first crate on the Tower Storage Container page and disconnect the pressure readout unit and the MSR PowerPack.  Use a small screwdriver to help remove the pressure readout's insertable terminal block (try to keep the cable wires attached to the terminal block) and to disconnect the power wires from the pressure readout unit.  The pressure readout unit and associated 24V AC transformer need to be cleaned and brought into the lab.  If this is the last shipment of towers to SNOLAB, the MSR PowerPacks should also be cleaned and go into the underground lab; otherwise, they should be returned to SLAC for the next shipment. 
    1.  
  3. Position the crate on the dirty side of the car wash using a pallet jack or the drift forklift so the tower shipping pallet can be picked up from inside the crate by a forklift that stays on the clean side of the car wash.
  4. Use an impact driver with a Phillips-head bit to remove the screws securing the top panel of the shipping crate, removing any tape holding the above cables to the crate.  Remove the top panel taking care to thread the pressure transducer and data logger cables through the hole in the top panel.
  5. Unscrew and remove the front and back panels of the shipping crate to provide access to the tower shipping container, which is triple bagged inside the shipping crate (there is no substantive difference between front and back panels, they are the largest panels one of which is removed in the photo below).
  6. Cut away the outer poly bag to expose the middle poly bag, leaving the floor of the outer bag that passes under the Tower Shipping Container in place.  Take care to not damage the pressure readout and data logger cables that pass through the outer bag.  Clean as appropriate.
  7. Cut slits in the front and back sides of the middle poly bag to allow the forklift (or pallet stacker) tines to fully penetrate the middle poly bag.
  8. Use the underground lab reach truck (left photo) or forklift (right photo) to slowly lift the Tower Shipping Container from the Tower Shipping Crate.  The tines should penetrate the middle poly bag through the slits cut above and the tines should fully extend through the plastic pallet on the Tower Shipping Container.  There are five Sorbothane feet mounted to the bottom of the plastic pallet, one at each corner of the pallet and one in the center.  The Sorbothane feet sit in pockets in the wooden floor of the shipping crate (see photo in step 1d).  The shipping container should be lifted ~10 cm so that the Sorbothane feet are well clear of the pockets.  Take care to minimize shocks and stop work immediately if there is any risk that the tower could be dropped or damaged.  The floor of the outer poly bag should stay behind.
    1.  
  9. Have the forklift operator move the Tower Shipping Container into the clean side of the car wash, taking care to minimize shocks during transport.  Stop work immediately if there is any risk that the tower could be dropped or damaged.
  10. Remove the middle poly bag, taking care to avoid having hands or feet underneath the load.
  11. Move a Tower Transport Cart from the underground lab into the clean-side car wash and maneuver it into position under the Tower Shipping Container.  Slowly lower the shipping container onto the transport cart.  The Sorbothane feet should rest fully on the transport cart as shown in the photo below.  Take care to minimize shocks and stop work immediately if there is any risk that the tower could be dropped or damaged.  Once the shipping container load is fully transferred to the transport cart, disengage the forklift from the shipping container and move it out of the way.
  12. Clean the inner bag and the exposed portions of the Tower Shipping Container in preparation for moving the tower into the underground lab.
  13. Slowly move the transport cart with the tower into underground lab, through the utility drift, to the entrance of the low radon clean room.  One member of the Day 4 team should open doors as needed, a second member should pull the cart, and the third and fourth members should watch for obstacles and hazards and be prepared to assist if needed (one spotter in front of the cart and one behind).  Take care to minimize shocks during transport.  Stop work immediately if there is any risk that the tower could be dropped or damaged.
  14. For the first cart, hold a mini tailgate meeting to go over the work plan, responsibilities, and areas of concern for moving the towers into the low radon cleanroom.
  15. Strap the Tower Shipping Container securely to the Tower Transport Cart.  While this reduces the effectiveness of the Sorbothane feet, we need to ensure that the tower does not slide off the cart going up the ramp into the low radon clean room.
  16. Check that the low radon cleanroom ramp is secured in place and double check that the Tower Shipping Container is well secured to the Tower Transport Cart.
  17. Have one member of the Day 3 team hold the door open while a second member pulls the transport cart up the ramp and into the cleanroom.  The third and fourth members of the Day 3 team should as spotters to make sure there are no obstacles or hazards that need to be avoided and be prepared to assist if needed (one spotter in front of the cart and one behind).
  18. Remove the straps installed in step 15 and position the cart into the planned storage location.  Lock the two locking casters to secure the cart.
  19. Check that the cart is properly secured in a location where there is little risk of accidental impact or falling objects.
  20. Reconnect the pressure readout to the pressure transducer, connect the pressure transducer to the 24V AC transformer, and record the pressure on the Tower Storage Container page.
  21. Connect a laptop with the MSR data logger software to the data logger cable and use the MSR software to stop the data logger.  The blue light should no longer be blinking every 10s and the LEDs near the microSD card should no longer blink.  Remove the microSD card with transit data from the logger, install the microSD card into the laptop and use the MSR Card Reader program to download the transit data.  Once downloading is complete, eject the microSD card and store the card in a card case for return to SLAC.  Install an empty microSD card into the data logger and restart the data logger with an 0.1 Hz accelerometer sampling rate.  Update the data logger section of the Tower Storage Container page to reflect these changes (you will also find instructions on setting up and configuring the data logger there).
  22. Repeat steps 2-21 for the second crate if applicable.


Task Hazard Assessment

A SNOLAB THA has been completed in consultation with SNOLAB EHS staff to assess the hazards and risks posed by this activity and identify mitigation strategies. 

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THA306 SuperCDMS Detector Tower Transport


Contingencies and Resolutions

With an initiative of this scope and with this many stakeholders it is important to acknowledge the numerous opportunities for issues to arise. While the majority of these issues present minimal to no risk to the success of the initiative, there are several foreseeable situations which would pose a threat to the process. Our robust planning and documentation allows us to mitigate if not outright retire the more minor possibilities, and the plans below will enable us to be prepared for more major situations.

Major shipping issue with no ETA or ETA beyond planned cage date

Initial review reveals this to be the most likely of all contingencies, and will thus require a plan in the event it should occur. While we have already allowed a full day of flex time to alleviate this any number of  scenarios could push delivery beyond 14MAY2023. The main concerns in this situation are the cosmogenic sensitivity of the detector towers and cage availability. Diverting delivery to our reserve safe storage site and working to plan collaboratively with Vale for a new cage run will drive successful resolution of this scenario. Upon notification that delivery will slip beyond our planned window the following time-sensitive steps will be actioned.

  1. Immediately notify VALE and cancel our planned date. 
  2. Immediately notify SNOLAB stakeholders, including scheduled staff
  3. Inform truck driver and divert truck to reserve safe storage (NORCAT)
  4. Deliver detector tower shipment to reserve safe storage (NORCAT)
  5. Request new cage date with VALE
  6. Discuss timetable with SuperCDMS collaboration
  7. Execute shipment per normal with new dates

Cage failure with repair date beyond planned run date, or indeterminate

While minor cage delays or losses of service are somewhat common, these typically last less than an hour and would have little impact on shipment. However, while extraordinarily unlikely, more significant failures are certainly possible. Once these time-sensitive steps are completed to bring the detectors to a cosmogenically safe environment a thorough set of next steps can be developed and actioned

  1. Immediately inform SuperCDMS collaboration
  2. Begin planning transport to reserve safe storage (NORCAT)
  3. Execute transportation to reserve safe storage or other location at SuperCDMS collaboration discretion
  4. Request updates and information from Vale as situation evolves
  5. Begin future planning

On-Site Disaster prior to Phase 1

Being a mine site Creighton is susceptible to any number of industrial accidents in addition to more typical natural disasters. While the scale and scope of these types of incidents vary wildly the steps would be identical to those outlined above to address cage failure. Once these time-sensitive steps are completed to bring the detectors to a cosmogenically safe environment a thorough set of next steps can be developed and actioned

  1. Immediately inform SuperCDMS collaboration
  2. Begin planning transport to reserve safe storage (NORCAT)
  3. Execute transportation to reserve safe storage or other location at SuperCDMS collaboration discretion
  4. Request updates and information from Vale as situation evolves
  5. Begin future planning

Call to Refuge during Phase 1

A call to refuge during phase 1 presents the greatest risk of damage, disruption, and other negative outcomes out of all reasonably anticipated scenarios. With this in mind a robust and detailed series of action items have been identified. It is important to note that the vast overwhelming number of calls to refuge are due to cage availability or to allow for the evacuation of an injured worker and these events are typically short in nature(<2hrs)

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Locations identified for emergency storage in the drift are highlighted below:

Call to Refuge during Phase 2

A call to refuge during phase 2 will have significantly reduced impact on operations compared to other times. The detectors will already be underground, in safe custody of SNOLAB, and minimal risk is posed to them within our facility. The following steps will be taken to get workers to safety and minimize risk to the detectors:

  1. Upon hearing the audible alert all work will cease immediately and all equipment will pause movement.
  2. Task lead will take command of the situation.
  3. The task lead will identify a method to make safe any ongoing work using best judgement. This will include the lowering of any suspended loads and moving any mobile equipment to the side of passageways to allow free movement. 
  4. Any opened doors between spaces shall be closed.
  5. Task lead will direct all workers to refuge in a calm expedient manner with attention to ensure all workers are accounted for
  6. Take refuge and await further instructions.
  7. Upon release from refuge task lead will discuss task status and any concerns with team. 
  8. Resume work.

Obvious shipping damage upon receipt 

While this risk is admittedly remote it is possible and worthy of consideration and contingency planning. The nature of this type of contingency and its potentially catastrophic nature leaves an open-ended contingency plan as our only reasonable option. Once these time-sensitive steps are completed a thorough set of next steps can be developed and actioned.

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