HIFAR Dismantling Methodologies - Pages - GNSSN Home Documents... · 2012-06-18 · cut up with...
Transcript of HIFAR Dismantling Methodologies - Pages - GNSSN Home Documents... · 2012-06-18 · cut up with...
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HIFAR Dismantling Methodologies
Algis Lencus
R2D2P Conference - Australia
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Contents
• Experience and planning by other organisations
• Possible methodology for HIFAR
• Issues that will drive a preferred methodology
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Methodology
• Reactor details (drawings, knowledge)
– Composition (materials and makeup)
– Characterisation
• Available (& best practice) technology for the
various tasks
• Build a methodology or better… give yourself
options
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Experience and Planning By Others
• Other “DIDO” Reactors
– Scotland: Dounreay – shutdown 1969
– England: DIDO & Pluto – shutdown 1990
– Denmark: DR-3 – shutdown 2000
– Germany: FRJ-2 – shutdown 2006
– Australia: HIFAR – shutdown 2007
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DIDO-class Reactors
• Similar composition
across all reactors
• Key source of
radioactivity is cobalt
60 in the top shield
plug
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DIDO & PLUTO: Methodology
• Immediate transition to “Care and
Maintenance”:
1. De-fuel core and drain circuits
2. Removal of external facilities & buildings
3. Removal of peripheral systems
4. Care & Maintenance mode until
decommissioning (funding & ILW repository)
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DIDO & PLUTO: Care & Maintenance
• Before:
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DIDO & PLUTO: Care & Maintenance
• Before & After:
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DIDO & PLUTO: Objectives
• Minimise
– Minimise hazards
• Minimise contamination & fire risk
– Minimise maintenance & cost
• Remove redundant plant
• Refurbish remaining required plant
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DIDO & PLUTO: Methods (non radiological)
• External uncontaminated and unactivated
systems removed using standard demolition
techniques after clearance.
• Attention paid to asbestos and other non-
radiological hazardous materials
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DIDO & PLUTO – Secondary Cooling
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DIDO & PLUTO - Peripheral Dismantling
• Pipework generally cut or unbolted
• Uncontaminated/unactivated steel
cut up with oxy-acetylene cutting
gear
• Experimental rigs: pipework
housed contaminants. Shearing &
crimping tool used to size reduce
and hold contaminants within &
store in 200L drums
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DIDO & PLUTO: Methods
• Plasma cutting equipment used to
cut thicker steel material
– Operators in air hoods & heat
resistant clothing
– Local extract system (filter
changes)
– Others in the building to wear dust
masks
• Airhoods used (tritium)
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DIDO & PLUTO: Systems
• Electrical cable strip out driven by:
– Clear areas with contamination
– Reduce fire load
– Use staff knowledge while available
– Only circuit continuously energised within the
building is the fire detection circuit
• Compressed air system kept in a modified
state to assist with decommissioning
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DIDO & PLUTO: Methods
• Beam instruments removed
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DIDO & PLUTO – Peripheral Buildings
• Marking and scabbling of contaminants
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DIDO & PLUTO – Peripheral Buildings
• Final contamination checks & demolish!
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DIDO & PLUTO: Methods
• Most of the decommissioning work carried out
using standard engineering techniques
• Use of the simplest available techniques
– Unbolting; sawing/cutting
– Plasma and Oxy-acetylene cutting
– Chipper and pipe shearing
– Basic decontamination methods
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DIDO & PLUTO: Decontamination
• Decontamination effort was balanced against
dose received whilst decontaminating
• Little decontamination was performed
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DIDO & PLUTO – Waste Management
• Part of the reactor facility included a shielded
room with extract which was utilised as an
active cutting room
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DIDO & PLUTO – Waste Management
• Half-height ISO containers used where items
are too large to fit in 200L drums (where not
practical)
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DIDO & PLUTO: Waste Management
• 200L drums had a 200kg weight limit (10kg
limit on individual items within)
• Half-height ISO had 25t weight limit (42t after
grouting) – weight limit was quickly reached
due to density of individual items
• Clearance Log sign off on contents in near the
Active Handling Bay
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DIDO & PLUTO: Lessons Learnt
• Active waste accumulated
relatively fast, resulting in
congestion and high dose rate
• Resourcing in this area was
revised to ensure appropriate
throughput and reduced dose
rate
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FRJ-2 and DR-3
• Similar route to
DIDO & PLUTO
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FRJ-2 and DR-3
• Removal of peripheral systems and
refurbishment of required systems
• Picking of “low hanging fruit”
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FRJ-2 & DR-3
• Unload core
• Drain circuits (dry circuits where possible)
• Removal of experimental facilities
• Removal of external process circuits and plant
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DR-3
• Removal of peripheral systems
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FRJ-2
• Cleared out the D2O Plantroom
• Removal of beam tubes
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FRJ-2
• Removal of beam instruments
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FRJ-2 & DR-3: Block dismantling
• Key problem is how to remove
the top shield plug?
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FRJ-2 & DR-3: Block dismantling
• Scaffold and elevator
arrangement and work
platform installed
• Plug is lifted with the
assistance of hydraulic
jacks
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FRJ-2 & DR-3: Block dismantling
• Cut RAT
• Removal of top shield rings
• Remove graphite
• Cut steel tank
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FRJ-2 & DR-3: Block dismantling
• Break up bioshield
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FRJ-2 & DR-3: Planning, Planning
• Mockups to be used to plan and
prepare
• Characterisation to plan and prepare
– Determine waste quantities
• Determine packaging and storage
requirements
– Determine dose rate
• Determine methodology, equipment
and monitoring requirements
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FRJ-2 & DR-3: Methods
• Heavy movement by crane and
hydraulic jacks
• Remote cutting tools fixed to top
to cut tank
• Long reach manipulator fixed to
top to remove graphite blocks
• Possibly fill core with water to aid
with shielding
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Dismantling Tools
• Concrete dismantling:
– Drilling; core drilling; sawing; jack hammering,
shearing; grinding; water jet cutting; abrasive jet
cutting
• Metal structure/component dismantling:
– Thermal: flame; plasma; arc; laser
– Remove bolted connections
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Decontamination Methods
• Wiping, brushing
• Ultrasound
• High pressure water or steam cleaning
• Blasting with an abrasive (sand, steel etc)
• Chiselling, grinding
• Peeling/scraping
• Chemical
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FRJ-2: Methods
• Reversible dismantling of the D2O
Plantroom
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HIFAR Methodology
• Decommissioning driven by safety, cost, and
use of local knowledge
• First step is planning, characterisation and
awareness of decommissioning techniques
– Dose projection – determine dose limits and
methodology
– Waste estimates – determine packaging and
storage requirements
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HIFAR Methodology
• Obtain a staged decommissioning licence and
EIS
• Stage 1: remove peripheral equipment
– Create space for future decommissioning
– Relatively low risk work (dose and waste)
– Serves as proving of techniques
• Stage 2: block dismantling
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HIFAR Methodology
• General methodology is to remove most
hazardous accessible items first to create a
safer working environment for the remaining
work
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HIFAR Methodology
• Remove top shield plug
– Diamond wire sawing
• Cut reactor aluminium tank
– Remote cutting tool
• Remove top shield rings
– Diamond wire sawing
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HIFAR Methodology
• Remove graphite blocks
• Cut up and remove steel tank
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HIFAR Methodology
• Cut up bioshield
– Diamond wire sawing (these can now be
bought from China for less than $20,000!)
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Know your tools
• Remote/long reach manipulators
• Suppliers include:
– Kraft
– SA Technology
– OC Robotics
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Know your tools
• Remote/long reach manipulators
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Know your tools
• Tools suited to nuclear
decommissioning don’t need to
be complex (the simpler the
better!)
• Industries that have “off-the
shelf” equipment:
– Demolition
– Off-shore oil & gas
– Bomb defusers
– Quarrying & mining
– Factory automation
– General consumer
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Know your tools
• Use proven commercial off-the-shelf equipment
that are cheaper and more reliable than
bespoke designs
• Don’t reinvent the wheel
• Several standard
cameras are cheaper
than a radiation-
hardened one
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Know your tools
• Techniques reviewed for each task type and
materials
• For example:
– Chemical decontamination is more effective than
mechanical methods for internal pipework
– Plasma cutting more effective than
jackhammering for steelwork
– Diamond wire saw better than plasma cutting for
concrete
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Know your tools
• Know the disadvantages for each method:
– Some may create liquid or airborne
contamination
– Is it reliable?
– Is it expensive?
– Are there safety risks?
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It is all in the delivery…
• Finally – remember that a well executed poor
plan can be better than a poorly executed
good plan
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Learn from Lessons Learnt
• You are decommissioning not de-constructing
• Don’t unbolt when cutting will do
• Plan for waste storage and processing
• Allow time for regulatory approval or structure
submissions so that work can proceed in parallel
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Thank you
• Wait for the videos…
• Any questions?