hifar refurbishment of systems for safe enclosure...hifar refurbishment of systems for safe...
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HIFAR Refurbishment of Systems for
Safe Enclosure
John Wernej
HIFAR Site Supervisor
May 2012
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HIFAR Decommissioning
• Phase A – Closure
• Part 1 – Shutdown, remove fuel, water, rigs
• Part 2 – Preliminary dismantling
• Part 3 – Refurbishing
• Phase B – Care & Maintenance
• Phase C – Decommissioning
• Part 1 – Preparation for dismantling
• Part 2 – Dismantling
• Phase D – Return to Green/Brown Field
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• Shutdown & removal of fuel, rigs, targets, absorbers and
water • As per HIFAR QMS and operational Licence
• Followed by cessation of shift staff coverage of HIFAR
• Care and maintenance licence application
• Minimisation of hazards • Sources
• Fire loading (wax, timber, clothing, boxes)
• Other hazards (gas bottles, chemicals)
• No plant modifications
Phase A – Part 1
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• Preliminary dismantling of selected redundant plant • Reduce footprint (quantity of plant and equipment to maintain)
• Minimise hazards (electrical, confined space, fire loading, contaminants)
Phase A – Part 2
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• Installation and commissioning of refurbished plant
• Reduce maintenance and operational costs
• Increase safety and efficiency
Phase A – Part 3
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• Jan 07 Shutdown
• May 07 Initial Possess or Control Licence application
• Jun 07 24hr shift staffing ceased
• Sep 08 Possess and Control Licence granted
• Apr 09 3D laser scan of HIFAR
• Jun 10 New EPS completed
• Jul 10 Containment Isolation System removals
• Jul 10 Space Conditioning System removed
• Mar 11 HIFAR cranes disabled (except main crane)
Refurbishment Milestones
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Refurbishment Milestones
• 2011 Security System refurbished
• 2011 New HP Instrumentation system completed
• 2011 New Fire Protection System installed
• 2011 Communication system rationalised
• 2011 New Stacks Monitoring System completed
• Jul 11 HVAC Upgrade completed
• Jul 11 New SCADA completed
• Jul 11 New HVAC/SCADA Control Room built
• Jan 12 EPSS wiring, diesel generators, switchboards removed
• Apr 12 Lighting System Refurbishment
• May 12 HIFAR Records Repositories
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Electrical Power Supply System –
HIFAR Operation • EPSS for HIFAR operations – large and complex.
• Mains supply to 2 separated switch boards. Standby boards
each backed up by a diesel generator. UPS supplies to
instrumentation and rigs.
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Electrical Power System – Post
Shutdown • Refurbished Electrical Power Supply - simpler design and
decreased capacity.
• Installed and commissioned in parallel with EPSS.
• New main switchboard has been installed.
• Power supply to the new HVAC and ventilation system, power
for the instrumentation, lighting and power supply. Stand-by
power available for the extract ventilation system and PLC for
the SCADA.
• Significant reduction in maintenance requirements
• Procurement and installation costs was $260,000
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Electrical Power System – Post
Shutdown
New Electrical Power
Supply
Distribution Board
New Ventilation Distribution
Board
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Electrical Power Supply
Observations • Planning and scheduling issues.
• Site location of plant – think about future use of areas
• Running two power supply systems in parallel, safety issues
• Selection of contractors
• Stakeholder relations – impact on other buildings
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Ventilation System • During HIFAR Operation:
• Active and Normal Extract systems and Normal Supply System
• Gamma monitoring on each filter bank which could shut down
HIFAR during operation. CIS radiation sensor on the filter banks
which would seal the ventilation system.
• Post HIFAR shut down
• Ventilation System refurbished,
• water seals removed,
• automatic fan change over
• variable speed fan motors
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Ventilation System – Observations
• Standby AVS to be kept
• Should you really dismantle the plant?
• Re-use plant as much possible
• Staff continuity on projects is important
• However different people will have different ideas
• Evaluate conditions early so as to prevent rework
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HVAC System • During HIFAR Operation:
• Supply air was conditioned. Old and obsolete controls and equipment. Heating elements used – expensive to operate
• Post HIFAR Shutdown
• New air handling unit and chiller installed. Heating and cooling via reverse cycle air conditioning.
• Observations
• Reuse existing plant and equipment (ducts) where possible and appropriate
• Benefits of designing plant in-house to ensure correct results
• Choose the contractor carefully
• Proven and reliable
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HVAC System
HVAC Chiller Unit HVAC AHU and Pipework
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SCADA
• During HIFAR Operation:
• Data Acquisition System was used to monitor the reactor operating systems, plant and experiments. The system did not provide any control functions of the HIFAR plant items.
• Post HIFAR shut down:
• For the unmanned HIFAR there is a requirement for a SCADA system to monitor residual radiation levels,
• building temperature pressure and humidity.
• SCADA system forms part of HIFAR BMS
• Observations
• Companies use different software standards
• Corel Draw vs. AutoCAD
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Radiation Monitoring
• HIFAR Operation:
• Eberline Gamma Monitors
• Obsolete & no spare parts available
• Triton Tritium Monitors
• Obsolete & no spare parts available
• Post HIFAR shut down:
• New Minalarm Gamma Monitors
• New Overhoff Tritium Monitors
• New units connected to SCADA system to enable monitoring from outside of the reactor
building
• Observations
• Will spare parts be available for the expected lifetime of new plant and equipment
• Sometimes good equipment may need to be replaced due to lack of spares
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