moata: contamination control & decontamination documents...moata: contamination control &...
TRANSCRIPT
Moata: Contamination Control & Decontamination
IAEA R2D2 Workshop
May 2012
Duncan Kemp
Overview
• Moata Decontamination Strategy
• Contamination control
• Radiation Monitoring
• HIFAR Waste Strategy
Moata Containment
Decontamination Techniques
• Dry Vacuum Cleaning
• Mopping
• Wiping down surfaces
• Scrubbing (Scouring pads )
• Grinding
• Water blasting
• Plasma cutting
MOATA First Phase ¨Non Radioactive¨
• Entry PPE (Possible Dust generation)
• Cotton overalls / Disposable overalls
• Personal monitoring equipment LTD´s
• P2 masks/ Double gloves taped (P3 masks maybe required)
• Sacrificial boots/ over shoes
Decontamination steps • Wire cut Concrete in Primary Zone
• Identify and Mark concrete waste
blocks
• Wash down of cut concrete blocks
in Secondary Zone
• Dry the wet & water log concrete
using heaters or time in secondary
or tertiary zone
• Wipe down using yellow cloths in
secondary zone
• Transport out of Secondary Zone
into Tertiary Zone
MOATA Second Phase ¨Radioactive ¨
• PPE for Entry into Primary / secondary areas.
• P3 Masks or Air Wash Masks
• Two way radios • Cotton overall,
disposable ovealls, taped doubled gloves, sacrificial boots, LTD´s,
• Active waste disposal bins eg. Gloves, cloths etc
s
Decontamination steps
• Break Concrete by remote rock
breaking equipment
• Wait until dust settles
• Transport empty yellow bins into
Secondary zone
• Load concrete into yellow bins
and secure bin lids
• Vaccum clean loaded bins
• Wipe down using yellow cloths
in secondary zone
• Transport out of Secondary
Zone into Tertiary Zone
Transport of Waste
• Survey waste by Health Physics Surveyor
• All exempt waste blocks and waste items clearly identified
• Final wipe down prior to transportation from secured area to low background area.
• Documentation / Clearance Certificate
• Transport to low background area
• Second Check of Waste
• Once load is ready to leave site it must be scanned via Vehicle Gate Monitor
Monitoring
• Regular Health Physics Surveys
• Daily monitoring of doses
• Airborne monitoring of inside and outside the tent
• Checking of PPE every time leaving area
• Clearance of items out of area
Implications for HIFAR
• Already Contained, may need small tents over contaminated structures (Heavy Water Room)
• Use of existing Waste Operations practices to account for and store waste
• Put waste directly into transport / storage packages to reduce handling
• Cut as little as possible
Estimated HIFAR wastes Waste Type Radiation level Expected Quantity Waste Strategy
Metal ILW 101 T Package into special containers
Metal LLW 50.5 T Package into special containers
Metal Free Release 162.7 T Recycling
Concrete LLW 643 T Package into special containers
Concrete Free Release 726 T Recycling
Graphite Nuclear Material 35 T
As it is nuclear material, it needs to be
controlled and will be packaged into
special containers. Graphite blocks
sealed with lead – will probably be ILW.
Parrafin Wax Free Release 88 T Recycling or Reuse
Parrafin Wax LLW 22 T Package into special containers
Cutting Slurry LLW 30 T Will be collected, analysed and route
determined.
Soft waste Free release / LLW Normal waste operations processes
Questions?