AFPC Norm Decontamination Facility Plant (NDF)

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AFPC Norm Decontamination Facility Plant(NDF)

• 1. Introduction
• The passage of produced water through pipe work
  and plants leads to the
• built up of Norm scale on the inner
  surfaces, which can present an
• external radiation Hazard during normal
  operation and an Internal and
• external hazard during maintenance work.
• AFPC have made a policy decision to manage the
  NORM wastes in
• accordance with best international practice.
• AFPC constructed a Norm Decontamination plant by
  the AEA
• Technology.

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• The AFPC NDF plant is used to remove NORM
  contaminated scales
• from Production equipments in order to be
  prepared for re-use or
• safe disposal.
• The plant is run continuously for 10 HRs per day
  and 365 days per year
• (except the break down maintenance De-
  sludging shutdowns)
• Sump pumps to transfer process water from the
  jetting bays / lancing
• machine into settling tanks that designed to
  allow fine NORM
• particulate to fall out of suspension in the
  process water stream.
• The AFPC NDF plant achieves decontamination
  level down to 0.37
• Bq/Cm² for Alpha radiation and 3.7 Bq/Cm² for
  Beta radiation.

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2. NDF Main Parts
1- A general area with a) Operators Change
room with showers with barriers and monitoring
equipments b) Visitors Change room with
showers c) A hooded Gas Cutting area
breathing air supply is required for Operators
d) An active Laundry with ventilation and waste
feed direct to a disposal tank e) A water
Jetting area for Decontamination  
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2- A Pump House with High Pressure Pumps for
Equipments Decontamination
Process water is extracted from settling tanks
and conveyed to the water
filter units, where cartridges will
remove particulate down to 10 micron. a) High
pressure pump for tubular decontamination b) Low
pressure pumps for sump and water
re-circulation 3-  Active air samplers to monitor
airborne activity and ventilation system

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Extract Ventilation System HEPA filters 4- A
tubular Decontamination plant for tubes
Decontamination - 1000 bar operational
pressure - It is hydraulically operated
and controlled de- scaling
machine water chiller is to cool the process
water temperature which has gained
heat after passing through high pressure pumps
and lances.
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5- A lay down area for equipments dismantling to
be decontaminated 6- A Lay
down area for decontaminated equipments 7- A
temporary waste store building for main and
secondary waste temporary storage.
8- Health Physics Laboratory
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AFPC NDF Plant Layout
NDF Layout
A. Chiller
W. Chiller
Tubular lance 1K.bar Press
H. VAC
W.Shop
Store
Controlled Area Tube Racks Contaminated Equipments
Air Luck
Tubular C.Room
Primary Settling Tanks
Secondary Settling Tanks
Dismantling Bay
Delay Tanks
Barrier
Jetting Bays 2.K. bar. pressure
Pump House
Hepa Filter Room
Op.Cha. Room
Burning Bay
S.Ch.R
HPS Office
Barrier
Laundry
Visitors Change Rooms
Offices
Mess Room
W.C
Main Gate

• Gate

Guard House
Contaminated Scale Drum Store
Clean Area
Sun Shade
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The NDF External Layout
Drum Store
Controlled Area At The back
Offices, Mess Room, W.C. Spares Stores
Clean Area
Air Luck
Main Gate Guard
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Burning Bay
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High Pressure Jetting Bay
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Tube Plant Machine
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Jetting Burning Curtain
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Waste Bags
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Filters Bank
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Controlled Area Contaminated Equipments Wrapping
1. Received items are wrapped in plastic bags. 2.
Vehicle wheels must be checked by the plant HPS
Prior to leave the Plant. Apply Decontamination
if required.
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H.P.S Office
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3. Decontamination of equipment

• 1. Receipt of equipment from Owners with all the
  required info included in job work Request form
  (Owner name, indicator and telephone number,
  location, equipment explanation for reused OR
  scrap, numbers of equipments, Norm certificate
  checked by the location RPS, job priority based
  on equipments reuse or HSE condition)
• 2. NDF Plant manager and HPS Recheck the work
  request information and compare.
• 3. HPS Recheck the Norm contamination of the
  received equipments
• 4. Off loading At NDF controlled area
• 5. Check the vehicle body and wheels prior to
  leave the facility and Decontaminate if required

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Clothing Minitor
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Air Sampler
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PPEs
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• 6. Write NDF Local number
• 7. Organizing Job based on priority
• 8. Start Decontamination based on equipments type
  until
• back ground
• 9. NDF contact the person who raised the WO when
  achieve the
• Decontamination.
• 10. Transport the Decontaminated equipments to
  the Central
• work shop for maintenance OR contact the
  Owner to take
• the equipments back as required.
• 10. Issue Clearance Certificate OR Radiological
  Survey
• Report as required

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Clean Equipments Area
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4. Important Issues Of AFPC NDF Plant

• 1) Modern, closed recycled process water system,
  Air extracts system (safer)
• 2) Tight environmental controls
• 3) All NDF workers are Norm aware and radio
  logically classified
• 4) All the plant workers carry out annual
  Radiological and Medical examination at AESC
  Establishment.
• 5) Personal Film Badges are inspected each two
  months by AESC
• 6) All unsafe act/condition and incidents shall
  be reported
• 7) The plant building is air conditioned to give
  a maximum working temperature of 25 C
• 8) Work schedule is 12 hrs day shift, Actually 9
  HRs work (From 0600 to 0830, from 0930 to
  1200, from 1300 to 1500 and from 1600 to
  1800 HRs)

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9) HPS Checks vehicle body and wheels prior to
leave the plant. Apply Decontamination
if required 10) All employees wear the
appropriate PPEs as required (Where
Respiratory Protective Equipment (RPE) is
provided for use in particular
Circumstances) 11) First Aid is provided at all
times 12) All employees shall be made aware of
Permanent Instruction, which is to be
followed in the event of an
incident requiring First Aid or Ambulance. 13)
The Norm contaminated scale Sludge are removed
from the tanks, and containerized in
plastic drums and stored in the waste
drum store through a sequentially De-sludging
shutdown of the plant.