group 3 presentation - iaea1 group 3 china, philippines, serbia, brazil assumptions only the reactor...
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GROUP 3China, Philippines, Serbia, Brazil
ASSUMPTIONS
Only the reactor building will bedecommissioned
No fission products from SF fracture
Simple technology
Wastes go to interim storage
Other materials considered no-radioactive wastes go to the landfill
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INTERDEPENDENCES
Legal aspects (national and international)
Radiation protection and environmental monitoring
Industrial safety
Personnel training
Procedures
Time frame for each activity
Record
DECOMMISSIONING ACTIVITIES
Six basic activities were identified:Characterization DecontaminationDismantlingTransportationTreatment and conditioning of the wasteStorage
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CHARACTERIZATION
Surface detectors (α, β, γ)
Analyzers for α, β, γ (spectrometer)
Smear tests
Measuring devices for different
DECONTAMINATIONPossible contaminated surfaces
ConcreteAl liner of the reactor poolCoolant Al pipingPb bricksReinforcing bars (concrete)Hold up tank (carbon steel)Equipment (pumps, heat exchanger, demineralizer tank)
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DECONTAMINATION: TECHNOLOGY
Concretescabbingshavinggrinding
Metalclosed system – mechanicalopen system – chemical
DECONTAMINATION: TECHNOLOGY
ToolsScabbing – chisel
Shaving – shaving machine
Grinding – grinder
Mechanical – hi-pressure washer
Chemical – chemical solutions
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DISMANTLING
If necessary, then
Hire a local contractor to the dismantling under the supervision of PNRI reactor staff.
The Operator shall be responsible for the technical specifications and procedures.
DISMANTLING (cont.)
Coordinate with the radiation protection and waste management department on the dismantling activities.
During dismantling, determine what waste packages are acceptable and the maximum activity as per package.Protect the package from external contamination.
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TRANSPORTATION
Contaminated materials/equipment shall be transported in carrying containers using a forklift or a truck with a lifting capacity.Removal of contaminated materials/equipment from the reactor building to a waste storage facility shall be coordinated with the radiation protection unit.
TRANSPORTATIONNecessary packaging arrangements shall be supervised by the radioactive waste department.
Internal regulations for the transport of contaminated materials/equipment shall be followed.
Segregation and labeling of waste packages shall be done.
Define the transportation route to the waste storage.
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TRANSPORTATION - TOOLS
forklift
weighing scale
survey meters
protective devices, such as pen
dosimeter, gloves, mask, coveralls
WASTE TREATMENT
Determine possible reuse or recycling
Segregate the packages in accordance
with the treatment options.
Determine if waste is within acceptable
criteria.
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WASTE TREATMENT
Liquid waste
precipitation
filtration
cementation
Ion exchange resin / sludges
Cementation
WASTE TREATMENT
Solid waste
Immobilization
Soil
Conditioning ???
Clothes/papers
compaction
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WASTE TREATMENT - TOOLS
tanks
chemicals
filter
resin
mixer
compactor
STORAGE
For each waste package, define position in the storage facility - mapRecord the dose rate of the storage facility-inside/outsideEnvironmental monitoring of air particulatesSecurity surveillance of the waste storage facility- camera
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NEEDS
Quality Assurance ProgramDefinition of the responsibilitiesSelection / Elaboration of legislation and regulationsProceduresDocumentation and recordsSafety and security requirementsData base
NEEDS
Quality Assurance Program (Cont.)Contractors (control, ….)Training programCalibration and sampling program Record procedureAudits and evaluation of non-conformance program
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NEEDS
Packages – qualify for transportation and storage, considering material, radionuclides and activity.
Development and implementation of treatment techniques for the wastes that can be arise from the decommissioning.
NEEDS
Implementation of tests to determine the waste product characteristics important for the storage.
Improvement of the interim storage unit regarding to the security, safety, environmental protection, monitoring program.
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NEEDSDevelopment of the Waste Acceptance Criteria for the storage.
Development of the documents to control the material generated during decommissioning activities.
Survey of available techniques for decontamination and dismantling in the country and contractors to do it.
ACTIVITIES 1 2 3 4 5 6 Planning xxxx Characterization xx Decontamination xxx x Dismantling x xxx Transportation xx xxxx Waste Treatment xxxx xxxx Storage xxxx xxxx xx Final survey xx Quality Assurance Record Control
SCHEDULE