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?