performance assessment modeling with goldsim
TRANSCRIPT
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
1 West Valley Quarterly Public Meeting • June 2016
Performance Assessment Modeling with GoldSim
2 West Valley Quarterly Public Meeting • June 2016
Presentation Outline
• Introduction to GoldSim • Handling Uncertainty • A GoldSim PA Example
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
3 West Valley Quarterly Public Meeting • June 2016
The GoldSim Interface
MODEL BROWSER WINDOW
MODELING PANE
DRAWING TOOLS
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GoldSim Basic Model Elements Data: input of a fixed value
Stochastic: input of a distribution for a value
Expression: a mathematical expression
Selector: for building complex conditionals
Event: timed or triggered event and consequences
Extremum: for tracking maximum values
Lookup Table: input of a table of values
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
5 West Valley Quarterly Public Meeting • June 2016
GoldSim PA Model Elements Species: input of chemical and rad species
Fluid: definition of a fluid (in this case, water)
Solid: definition of a porous solid
Source: contaminant source
Cell: compartment containing materials
Aquifer: definition for simple groundwater transport
Receptor: definition of an exposed receptor
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Model Elements: Materials
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
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Model Elements: Pathways
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The Species List
A list of radionuclide species is defined, along with the decay rate and decay products (and branching fractions) for each.
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
9 West Valley Quarterly Public Meeting • June 2016
Many Types of Distributions are Available to Represent Uncertainty
uniform
normal
triangular
gamma log-normal
What is chosen must have some basis in reality.
discrete
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Typical Results Any state or condition of the model can be tracked and graphed through time (e.g. concentrations, flow rates, doses).
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Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
11 West Valley Quarterly Public Meeting • June 2016
A Screenshot Tour of Neptune’s
Generic PA Model
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Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
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Modeling elements are logically organized on the page, with clear naming and accompanying text.
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
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This example shows how soil/water partition coefficients (Kds) are defined.
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Here’s an example of how the rate of water flow into the ground is calculated.
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
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Infiltration is defined with some uncertainty, since we do not know the value perfectly.
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Detail of the definition of UnsatFlux. Note that names that make sense are used.
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
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Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
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A single run (deterministic) simulation will generate a single time history of dose.
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A probabilistic simulation will generate several time histories of dose, showing uncertainty.
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
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A probabilistic simulation can also be shown using a statistical summary.
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Many types of results can be examined.
Neptune’s Performance Assessment Modeling Using GoldSim
June 2016
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The Generic PA Model is available here:
www.neptuneinc.org/genericpa
The GoldSim Player is available here:
www.goldsim.com/web/downloads