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Availability
2
• Extremely Low Probability of Rupture (xLPR), Version 2.1 is now publicly available
• No fees, but prospective users must satisfy certain citizenship requirements and sign an End User License Agreement (EULA)
• Prospective users may initiate the request process from https://www.epri.com. Search for and navigate to Product ID 3002019356.
• A copy of the code and supporting materials will be made available for download after a request is approved
EVENTS
1. Models OverviewJune 3rd | 10-12 EDT
2. Setting Up the InputsJuly 15th | 10-12 EDT
3. Running the Simulation and Retrieving Results
July 29th | 10-12 EDT
4. Advanced MethodsAugust 5th | 10-12
EDT
3
Seminar 2: Setting Up the InputsAgenda
4
Introduction and Opening RemarksResources for Inputs
Review of the Input SetInput Uncertainties
Inputs Group Report OverviewSim Editor
DemonstrationsBreak
Questions and AnswersClosing Remarks
Introduction and Opening Remarks
5
6
WEBEX Q+A
Webex Desktop ClientWebex Internet Browser
Initial Set-Up Tips
7
• Keep a copy of your original product download zip file
• Maintain the original folder structure
Maintenance Requests
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• Code is supported by an active maintenance program
• Users may submit problem reports and requests for new features or enhancements
• Submissions should be sent to [email protected] and [email protected]
• See Section 5.2 of the user manual for submission format and further details
Resources for Inputs
Key References
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• Provided in release package– xLPR-UM-2.1, “User Manual for xLPR Version 2.1”– xLPR Sim Editor 1.0 User’s Guide– xLPR-TRN-Introduction, “Training Manual – xLPR Code Hands-On
Introduction”
• Release pending– xLPR-GR-FW, “Computational Framework Development, Testing, and
Analysis”– xLPR-GR-IG, “Inputs Group Report”– xLPR-MSGR-WRS, “Welding Residual Stress Modeling Development”
Input Databases (1 of 2)
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• Provided in release package
• Weld Types - Use on Properties sheet– Westinghouse Reactor Pressure
Vessel (RPV) Outlet Nozzle– Babcock and Wilcox (B&W) Reactor
Coolant Pump (RCP) Inlet Nozzle– Westinghouse Steam Generator
(S/G) Inlet Nozzle
• Materials– Use for Left Pipe or Right Pipe
sheets• 3 Carbon and Low Alloy Steels• 3 Stainless Steels
– Use for Weld or Mitigation sheets• Alloy 82/182• Alloy 52/152
GN1
Slide 11
GN1 Glunt, Nathan, 7/14/2020
Input Databases (2 of 2)
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• Weld Residual Stresses (WRS)– Use on Axial WRS and Hoop WRS
sheets– Profiles for each combination of weld
type, mitigation, and repair depth
Mitigation Repair DepthUnmitigated 0%
15%
50%
Overlay 0%
15%
50%
Mechanical Stress Improvement
Process (MSIP)
0%
15%
50%
Inlay 0%
15%
50%
GN1
Slide 12
GN1 Glunt, Nathan, 7/14/2020
Review of the Input Set
Inputs Set Overview
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• xLPR-2.1 Input Set.xlsx
• Developed and tested under xLPR quality assurance program standards
• Scope– 10 worksheets accept user inputs
• User Options sheet• Properties sheet• 4 sheets covering material properties• 2 sheets covering fatigue• 2 sheets covering WRS
– 3 support worksheets– 13,597 possible input cells
• Walkthrough
Input Uncertainties
Aspects of Uncertainty
16
• Input Variable Uncertainty– User-defined distributions that
characterize the range in expected input values
– Accounted for via Framework sampling
• Model Parameter Uncertainty– Distributions for parameters used to
calibrate models to specific sets of environmental conditions based on statistical analysis
– Accounted for via Framework sampling
• Model Uncertainty– Mathematical forms that could be
used to represent the behavior of interest
Direct Model 2
Model Uncertainty
Inputs to xLPR
Uncertainty Distributions
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• Supported distribution types and their input parameters are listed on the Drop-List Options sheet
Negative BinomialNormalParetoPearson Type IIIPoissonSampled ResultsStudent’s tTriangularUniformWeibull
Generalized BetaBetaBetaPERTBinomial CumulativeDiscreteExponentialExtreme ProbabilityExtreme ValueGammaLog-Normal
Input Uncertainty Characterization
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• Aleatory– Uncertainty due to natural,
unpredictable variation– Irreducible
• Epistemic– Uncertainty due to lack of
knowledge– Can, in principle, be
eliminated with sufficient study
Uncertainty Tips
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• Although inputs may be a mix of aleatory and epistemic, using a single type supports a classical Monte Carlo approach
• Sampling options should be recorded in the Input Set, but are actually made in GoldSim
• Sampled input values don’t change until next operating period or next realization
Inputs Group Report Overview
xLPR Inputs Group Scope
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• Cases1. Westinghouse RPV Outlet Nozzle2. B&W Reactor Coolant Pump Inlet Nozzle3. Westinghouse S/G Inlet Nozzle
• Scenarios1. Risk analysis due to fatigue2. PWSCC with no mitigation, circumferential
flaws only3. PWSCC with no mitigation, axial flaws only4. PWSCC with stress mitigation at 20 years5. PWSCC with stress mitigation at 40 years6. PWSCC with zinc mitigation7. PWSCC with hydrogen mitigation8. PWSCC with zinc and hydrogen mitigation9. PWSCC with inlay mitigation10. PWSCC and fatigue with stress and
chemical mitigation11. Fatigue initiation
• Materials
Cases correspond with Weld Type database
xLPR Inputs Group Results
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• Key information sources– Software quality assurance and other xLPR Version 2 project documents– Vendor information– American Society of Mechanical Engineers Boiler and Pressure Vessel Code– U.S. Nuclear Regulatory Commission (NRC) licensing correspondence– NRC NUREG-series reports– Electric Power Research Institute technical reports– Other literature
• Main contents of report– Appendix A: Non-material Property Inputs– Appendix B: Material Property Inputs
• Important caveat– It was not the intent of the Inputs Group to develop or recommend a
comprehensive set of inputs for analyzing plants on either a generic or plant-specific basis
Inputs Group Tips
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• Document source of inputs
• Recommended to provide both deterministic and probabilistic inputs– For deterministic inputs, define a
distribution (e.g., discrete distribution)
– For probabilistic inputs, define a deterministic representative value (e.g., distribution mean or median)
• Truncation is preferred
• Be careful of GoldSim minimum required inputs– Deterministic Value– Distribution Type– Required distribution parameters
Demonstration on Researching an Input
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• Consider the plant operating pressure
• Determine the xLPR global identification number
• Determine the recommended value
• Research basis for recommended value
• Purpose: User-friendly Graphical User Interface (GUI) to help – Create xLPR Input Sets– Use and maintain input databases
• Modes: – Simulation mode
• For creating and modifying simulation Input Sets– Database mode
• For creating and modifying data sets– Material properties, WRS profiles, weld type properties– Pre-defined and user-defined
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OVERVIEW
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WORKFLOW
• Sim Editor reads and writes to Excel files
• More user friendly than Excel files– Hides input parameters
that are not relevant to the simulation options chosen
– Organizes inputs in a more user-friendly manner
– Includes error-checking for input value ranges
– Smart database imports and database management
DatabasesInput
Databases
xLPR Input Set
Inputs
• Sim Editor User Guide – Included in zip file
• Extract the files from the zip file• Run the xLPR Sim Editor installer
– For additional information on installation, see the User Guide
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SET UP
• “GET STARTED” tab
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HOME SCREEN
Simulation Mode:To create or edit a
simulation Input SetDatabase Mode:
To create or edit databases
To install databases or define the path of databases
• Database Configuration– Default path shown in figure below (may be changed)– Installing database files
30
DATABASE SET UP
To define path of database files or define new path
(Path shown is default path)
To install database files that come with the Sim Editor
xLPR Sim EditorSimulation Mode
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SIM EDITOR WITHIN xLPR V2.1 MODEL
Crack Opening Displacement
• “SIMULATION” tab– Input Set interface
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GENERAL SETTINGS
Distribution parameters appear if this is changed to aleatory or epistemic
Global and model settings
Material properties
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GENERAL SETTINGS
Distribution parameters appear when data source is changed to
aleatory or epistemic
Changed to a distribution
• Weld options
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WELD OPTIONS
To import datasets from Weld Type and Materials databases
To import datasets
from WRS databases
Post-mitigation WRS does not show if no physical mitigation
• Import any weld options and materials FIRST• Importing from a database
will overwrite any input you may have already changed
• Always save progress before switching model settings tabs
36
Tips, Tricks, and Suggestions
• WRS– Axial/hoop– Pre-mitigation/Post-
mitigation– Sampling loop– Correlation coeff.– Importance sampling
• WRS at inside diameter– Plot button
• Constant– Mean stress only
• Epistemic/aleatory– Mean stress– Mean stress + 2 std.
deviations– Mean stress - 2 std.
deviations
37
Weld Residual Stress
GEOMETRY
• Geometry– Units
• Fixed for these inputs
– Validation ranges• Example: changes
to wall thickness will change validation range for outer diameter
• Error message issued if entry is outside of valid range
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Note changes to outside diameter validation range when pipe wall
thickness is changed. Note error flags, if any. Go to weld thickness to resolve.
• If a value is entered that is out of range, the Sim Editor will prompt the user to correct on the spot
39
Tips, Tricks, and Suggestions
• Operating Conditions– General Operating
Conditions• Flow rate, H2 level, Zn level
– Operating Periods• Options for load or stress input
– Loads/Stresses– TIFFANY (Fatigue)
Parameters– Transient Types– Transient Properties– Thermal Transients
• Plot button40
OPERATING CONDITIONS
Yellow caution
signs indicate
that these panels are not used based on
the options selected for
the simulation.
• Mitigation options– Type: none, stress only, chemistry only, stress and
chemistry– Mitigation material (if overlay or inlay)
41
MITIGATION OPTIONS
To import mitigation material from Materials database
42
CRACKS
• Crack Initiation Type– Initial flaw density, stress-corrosion cracking (SCC), fatigue,
SCC and fatigue• Crack Initiation
– Inputs• Crack Growth
– Options• Coalescence• Stability
– Options and tolerances
• Leak Rate– All leak rate module inputs
in one place Note: Crack properties associated with a particular material are under the Material buttons.
• Options– Flags, leak thresholds, schedule
options– Ligament flags affect units of
conditional inputs
• Timing• General Properties• Conditional Inputs
– Pre-Mitigation– During and Post-Mitigation– Post-Overlay– Post-MSIP– Post-Inlay
43
INSPECTION ANDLEAK DETECTION
• Material properties– Left pipe– Right pipe– Weld– Mitigation material
• Inspection and leak detection properties
44
CORRELATIONS
• Material Properties– All inputs in the Left Pipe,
Right Pipe, Weld, andMitigation worksheets of xLPR-2.1 Input Set.xlsx
– Type of material is shown at top of window and in the buttons
• Weld and Mitigation– Mitigation panels accessible
only when there is a mitigation material
• Left and Right Pipe– Excludes crack initiation
panels
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MATERIALS
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TOOLS
• “TOOLS” tab
Importance Sampling List button identifies all parameters in a simulation that have been
selected for importance sampling.
47
HELP
• “HELP” tab
Do not submit feedback through the Sim Editor. Feedback should be submitted to
xLPR Sim EditorDatabase Mode
• Available databases shown in tabs– Weld Type, Material, Axial WRS, and Hoop WRS
• Data set selector• Action buttons• “Pre-Defined” vs. “User-Defined” databases
– Password protection of Pre-Defined data sets• No filtering of input fields
– All input fields show at all times (including constants and distributions)49
DATABASE MODE
Demonstrations
Break
Questions and Answers
53
WEBEX Q+A
Webex Desktop ClientWebex Internet Browser
Closing Remarks
Looking Forward
55
• Running the Simulation and Retrieving Results – July 29th | 10-12 EDT– Suggest review of user manual topics beforehand
• Section 3.3.2 to set up the sample sizes and random seeds• Section 3.4 to run the code• Section 3.5.2 to inspect for errors• Section 3.5.3 to view results
• Advanced Methods– August 5th | 10-12 EDT
