ML21098A128: Difference between revisions

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{{#Wiki_filter:Modeling Overview Gabriel Taylor, P.E.
{{#Wiki_filter:}}
Office of Nuclear Regulatory Research
 
Overview of ZOI development Current Duration Scenario Equipment Config.
Material Modeling                +                Fragility          =        ZOI Tables Incident Energy                        Target Vulnerability      Zone of Influence (ZOI)
Heat Flux                                Threshold HEAF Research Working Group Update - April 6th, 2021                                  2
 
Flashback : April 2018 Merging with incorporation of CFD modeling insights HEAF Research Working Group Update - April 6th, 2021 3
 
Modeling Approaches
* SNL SIERRA Suite
      - Multi-physics coupled model
      - Focus on modeling arc (source term)
* NIST FDS
      - CFD modeling
      - Focus on modeling thermal transport to target
* Empirical
      - Data fit
      - Focus on specific phenomena; enclosure breach, arc voltage HEAF Research Working Group Update - April 6th, 2021 4
 
Modeling Scenarios
* Medium Voltage, Non-segregated phase bus duct
 
==Enclosure:==
Steel or Aluminum
      - Conductors: Aluminum or Copper
* Medium Voltage Switchgear
      - Configuration: Supply, Main, Load
      - Energy Profile: Stiff, Decay, or Stiff + Decay
      - Conductors: Aluminum or Copper
* Low Voltage Switchgear
      - Conductors: Aluminum or Copper HEAF Research Working Group Update - April 6th, 2021 5
 
Scenario Consolidation
* PRA document covers over 300 scenarios for just aluminum
* Low energy scenarios are being removed from initial list using empirical correlations and slightly conservative fragility thresholds
* Reduces scenario list by 88%
* Some scenarios have similar or identical hazard and can be consolidated even further HEAF Research Working Group Update - April 6th, 2021 6
 
Summary
* Overall approach to decouple modeling and fragility efforts remains intact
* Modeling approach has evolved into a hybrid between category and dynamic
* PRA guidance document supports defining model scenarios
* Modeling appears to provide reasonable estimates to inform the working groups ZOI determination. However, areas for uncertainty reduction exist.
HEAF Research Working Group Update - April 6th, 2021 7}}

Revision as of 20:40, 17 January 2022

1D - Modeling Overview
ML21098A128
Person / Time
Issue date: 04/06/2021
From: Gabe Taylor
Office of Nuclear Regulatory Research
To:
Kenneth Hamburger
Shared Package
ML21098A124 List:
References
Download: ML21098A128 (7)
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