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{{#Wiki_filter:IDHEAS dependency model and guidance (IDHEAS-DEP)
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Jing Xing, Michelle Kichline, Y. James Chang,,
U.S. Nuclear Regulatory Commission Presented by Jing Xing to the public meeting on IDHEAS April-08-2021
 
Overview
: 1. IDHEAS Dependency Model
: 2. NRC 2021 HRA Dependency Workgroup
: 3. Guidance for using IDHEAS Dependency Model in HRA
: 4. Path forward with IDHEAS dependency 2
 
IDHEAS-G Dependency Model Identify the dependency context (HFE1, HFE2)
* Consequential dependency in an event sequence
* Resource-sharing dependency
* Cognitive dependency HFE1 and HFE2 are                                  Model the dependency context HFE2lHFE1 independent          All no    Any            Are there changes to HFE2s:
Definition?    Time required and time available?
P(HFE1,HFE2)=                    yes?
Feasibility?    Additional CFMs?
P(HFE1)*P(HFE2)                                  Critical tasks? PIF attributes?
Yes Calculate P(HFE2lHFE1) based on P(HFE1,HFE2) =
context changes to HFE2 and using P(HFE1)*P(HFE2lHFE1) same method as individual HFEs HFE2lHFE1 means the occurrence of event HFE2 given the occurrence of event HFE1, where HFE1 is the first event and HFE2 is the second event.                        3
 
NRC HRA Dependency Workgroup (Nov. 2020 - March 2021)
 
==Purpose:==
Understand HRA dependency and develop guidance for using IDHEAS Dependency Model
* Activities:
  - Phase 1: Six analysts each performed dependency analysis of an example event (from SDP or PRA models) using IDHEAS-ECA and IDHEAS Dependency Model
  - Phase 2: The project team developed the draft guidance and the analysts piloted it with the examples
  - Phase 3: The workgroup will review and comment on the fully written guidance
* Workgroup members:
  - A. Brown, C. Hunter, J. DeJesus, M. Pohida, and K. Tetter, Reliability And Risk Analysts, NRR and RES
    - A. Rosebrook, Sr. Reactor Analyst, Region II
    - K. Gunter, Lead Engineer, Jensen Hughes Company
    - M. Presley, Principal Technical Leader, EPRI                          4
 
IDHEAS dependency guidance framework HFE2HFE1 Pre-determination:
Assess the relationships between              Entry conditions            No STOP met?
the HFEs for no dependency, complete dependency, or further                        Yes No dependency analysis Step 1 Pre-determination                    Complete Screening analysis:
dependency Assessing screening dependent HEPs without using IDHEAS-ECA (for HRA applications where detailed information is not              Step 2                    Step 3 available or the individual HEPs of Screening analysis        Detailed analysis the HFEs were not from IDHEAS-ECA)
Graded screening          IDHEAS-ECA calculated Detailed analysis:                  dependent HEP                dependent HEP Analyze dependency factors and their impact on HEPs using IDEHAS-ECA
 
Preliminary insights on IDHEAS dependency guidance
* IDHEAS dependency analysis is based on IDHEAS-G and IDHEAS-DATA
    - THERP dependency: Each relationship deems a multiplier
    - IDHEAS dependency: The context of each relationship is analyzed for its impact on the dependent HEP
* The assessed dependency is explainable on why the dependency occurs and how it impacts HEPs
    - Enhanced HRA traceability and documentation
    - Explicit identification of dependency mechanisms for reducing dependency
* Preliminary piloting of the draft dependency guidance dependency shows promise
    - that the dependent HEPs calculated from IDHEAS dependency model were more consistent with analysts assessment, not overly conservative 6
 
Path forward with IDHEAS dependency
* IDHEAS Dependency Model in IDHEAS-G report (NUREG-2198)
Appendix K, in publication, 2021
* Publish The guidance for using IDHEAS Dependency Model (IDHEAS-DEP) as a NRC Research Information Letter and collect public comments
  - summer 2021
* Document and publish the dependency analysis examples from the NRC Dependency Workgroup - summer 2021
* Update IDHEAS-ECA report and software tool by incorporating IDHEAS dependency guidance - winter 2021 7}}

Revision as of 19:15, 8 September 2021

Item 5 IDHEAS Dependency Model and Guidance by J Xing - 2021-04-08 Public Meeting
ML21096A183
Person / Time
Issue date: 04/08/2021
From: Chang Y, Michelle Kichline, Jing Xing
NRC/RES/DRA/HFRB
To:
Xing, Jang - 301 415 2410
Shared Package
ML21096A176 List:
References
Download: ML21096A183 (7)
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