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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
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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.
The AFPC NDF plantis 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.
2. NDFMain 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
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
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.
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
AFPC NDF Plant Layout NDF Layout A. Chiller W. Chiller Tubular lance 1K.bar Press H. VAC Store W.Shop Controlled Area Tube Racks Contaminated Equipments Air Luck Tubular C.Room Primary Settling Tanks Secondary Settling Tanks Dismantling Bay Delay Tanks Barrier Hepa Filter Room PumpHouse Jetting Bays 2.K. bar. pressure 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
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
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.
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
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
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 06:00 to 08:30, from 09:30 to 12:00, from 13:00 to 15:00 and from 16:00 to 18:00 HRs)
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.
