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Decommissioning and Closure of Mining and Minerals ... · 4 4 Introduction •South Africa has a...
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Mogwera Khoathane (Pr.Sci.Nat)
5 October 2016
1st NNR Regulatory Information Conference
Decommissioning and Closure of Mining and Minerals Processing Facilities in South Africa
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• Introduction
• Role of the regulatory body
• Exposure situations
• Characterisation of the facility
• Removal of residual process material
• Dismantling and demolition
• Final radiological survey
• Risks to the public from legacy sites
• Summary
Talk Outline
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Introduction
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Introduction
• South Africa has a large and diverse mining and minerals processing industry that started over a hundred years ago.
• In this presentation decommissioning and closure activities that are typically associated with the mining and minerals processing facilities are discussed.
• Details on the site characterization, closure criteria and assessment methodology are also discussed.
Module 4: Compliance Assurance
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Closure objectives
The objectives of closure is to ensure that the waste management facilities
are left in a condition that will ensure their continued compliance with the
requirements for the protection of human health and the environment.
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Role of the regulator
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Role of the regulator
• At a time agreed upon with the regulatory body, and at least five years
before the anticipated closure date, the operator should submit a final
closure plan for regulatory approval.
• The closure plan is then reviewed by the regulatory body so as to verify its
effectiveness.
• The design of the programme is based on the safety assessment in which
impacts on human health and the environment over an appropriate period
into the future should be considered.
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…Role of regulator
• Prior to implementing any closure activities, it is important that the closure
plan is approved by the regulatory authorities.
• The plan is required to include the changes in technology, regulations, and
public concerns that have occurred since the facility was initially
authorised, opened and operated.
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…Role of regulator
As part of an institutional control programme, all relevant records of the
location and characteristics of closed facilities, restrictions on land use and
on-going monitoring and/or surveillance requirements are maintained in
accordance with applicable legal requirements.
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…Role of the regulatory body
• The primary objective of the Regulatory Body is to ensure that the operator
fulfil its responsibility to protect human health, and the environment from
possible adverse radiation effects arising from NORM facilities.
• Some of the main functions of the Regulatory Body are to:
– Establish regulations and guides, upon which its regulatory actions are based.
– Review and assess submissions on safety from the operators both prior to authorisation and periodically during operation as required.
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Exposure situations & dose assessment
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Exposure pathways
• The decommissioning tasks that will be performed could result in
an environmental release from the facility and which have an impact on the
local environment must be identified.
• The potential pathways that could be involved with these releases are
described and the potential discharge for each task evaluated.
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Exposure pathways
Exposure Circumstances
Normal Exposure
Certain to Occur
Potential Exposure
May Occur
Public
Effluent Discharge
Waste Management
Transport
Accidental Releases
Source Loss
Future Exposure
Workers
Operations
Maintenance
Decommissioning
Accidental Release
Source Loss
Shield Loss
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Exposure pathways
Conceptual Exposure Model
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SOURCE
Release or Spill
Materials and
Affected Media
TRANSPORTRECEPTOR
Human or
Ecological Point
of ExposureAir, Soil, Groundwater,
or Surface Water
Migration Mechanisms
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Exposure pathways
Typical Pathways
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contaminant
source
Atmosphere
Groundwater
Surface water
Terrestrial Plants
Soil
Terrestrial Animals
Aquatic Plants
Aquatic Animals
Dose to
Humans
Sediment
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Dose assessment
Steps in the process:
• Identify radionuclide source term
• Analysis of the transport of radioactive material
• Defining the release scenarios and pathways to the environment and
humans
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Dose assessment
• Determine and analyse the consequences of release to humans and
environment
• Compare the consequences to regulatory criteria
• Iterate if necessary
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Environmental impact
• During decommissioning of NORM facilities, radioactive and nonradioactive
pollutants may be released to the environment.
• These releases are controlled in compliance with appropriate national
regulations.
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Environmental impact analysis
• Dose to critical group = sum of doses via all discharge routes and pathways
• Doses are calculated on a per age group basis
1-2 years
2-7 years
7-12 years
12-17 years
Adult
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Characterisation of the facility
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Characterization of the facility
• Authorisation holder conducts safety assessment for decommissioning and
for implementing a safe approach during the work. Safety assessment
report is informed by:
– The survey conducted to identify the inventory and location of radioactive materials and other
hazardous materials.
– An adequate number of radiation and contamination surveys conducted to determine the
radionuclides, maximum and average dose rates, and contamination levels for inner and outer
surfaces throughout the facility.
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Characterization of the facility
• Results of such surveys assists in the preparation of radiation and
contamination maps.
• Special surveys to determine the penetration depth and extent of
contamination may also be necessary.
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Removal of residual process material
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Removal of the residual process material
• Significant amounts of residual process material may be present in both
planned and unplanned locations at the time of shutdown.
• This material, which may consist of high activity NORM waste, can give rise
to hazards when disturbed by decommissioning operations.
• Appropriate information on the disposition of the material should be
provided.
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Removal of the residual process material
• Even when the bulk of the residual process material has been removed, a
significant amount of radioactive contamination may remain.
• The expeditious removal of the residual process material, which would be
beneficial and would reduce requirements for monitoring and surveillance,
is considered.
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Decontamination
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Decontamination
The objectives of decontamination include:
• Reduction of potential on-site and off-site radiological hazards associated
with further decommissioning activities;
• Reduction of exposure to permit manual dismantling;
• The reclassification of areas to a less hazardous category;
• The salvage of equipment, materials or premises, including clearance for
unrestricted use;
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Decontamination
Before any decontamination technique is selected, an evaluation of its
effectiveness and of the potential for reducing total exposure should be
performed.
Examples of decontamination techniques:
• High pressure washing
• Sandblasting
• Acid leaching
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Decontamination
The evaluation of the decontamination technique include:
• The probable radiation doses involved;
• An assessment of the potential impact on the workers and the environment;
• Assessments of the primary and secondary wastes arising from the
decontamination, including their volumes, nature and activity.
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Decontamination
Consideration is given to the compatibility of waste with existing
systems for treatment and disposal.
In any case, before waste is generated, adequate arrangements for disposal
or storage are in place.
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Dismantling
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Dismantling
There are many options available for dismantling, and their selection
depends on the types and characteristics (size, shape and accessibility) of
the equipment and structures to be dismantled.
Some considerations:
• The dismantling equipment to be used should be reliable and simple to operate, decontaminate and maintain.
• There should be effective methods available for controlling airborne radionuclides.
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Dismantling
• There should be effective methods available for controlling hazardous
materials other than radiological materials.
• The waste containers and the associated handling systems and routes for movement should be designated prior to the start of dismantling work.
• The time necessary to perform the dismantling task should be evaluated.
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Dismantling equipment
Specialised grinder for
skimming the surface of
concrete. Useful for
removing high grade
gold deposits from
concrete.
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Dismantling equipment
Safe demolition of steel/concrete
First sheering down the roof
And then crushing down the
Concrete and brick walls
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Dismantling equipment
• Largest demolition sheers
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Demolition
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Demolition
• In many cases, activities for decontamination and dismantling are aimed at
making the demolition of the building structure a non-radiological activity.
• Care is exercised during demolition to ensure that contaminated material is
segregated from non-contaminated material.
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Demolition
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Demolition
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Demolition
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Final radiological survey
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Final radiological survey
At the completion of decontamination and dismantling activities, a
radiological survey of the facility is performed to demonstrate that the
residual activity is acceptably low and within the criteria set by the
regulatory body and that the decommissioning objectives have been fulfilled
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Final radiological survey
• The criteria established by the regulatory body is in terms of measurable
quantities that can readily be compared with field measurements.
• Sampling for chemical contamination could be combined with the
radiological survey.
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Risk to the public arising from legacy sites
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Summary
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Summary
• Uncontrolled closure and decommissioning of mining and milling generates
a range of different wastes which have the potential to impact the public
and the environment.
• There is a range of pathways by which the operation may cause exposure
and these may change over the life of the facility.
• Tailings and sometimes waste rock are generally have most significant
potential impacts.
• Economic and social factors are a important consideration for both the
operator and the regulator.
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Thank you….