ML20267A195
| ML20267A195 | |
| Person / Time | |
|---|---|
| Issue date: | 09/23/2020 |
| From: | Chang Y NRC/RES/DRA/HFRB |
| To: | |
| Sean Peters, Carmen Franklin | |
| Shared Package | |
| ML20267A193 | List: |
| References | |
| Download: ML20267A195 (11) | |
Text
IDHEAS-ECA Y. James Chang RES/DRA/HFRB Presented at the ACRS Subcommittee Meeting 9/23/2020 1
Cognitive Basis for HRA (NUREG-2114) 2 IDHEAS General Methodology (IDHEAS-G) (NUREG-2198)
IDHEAS Internal At-power Application (NUREG-2199)
Scientific Literature
- Research, operation experience IDHEAS-DATA IDHEAS-ECA (RIL-2020-02)
HRA applications HRA applications SACADA and all data sources
IDHEAS-ECA
- A human reliability analysis (HRA) method for event and condition assessment (ECA) in NRCs risk-informed regulation.
- A HRA process to
- Identify human failure events, critical tasks, and corresponding contexts
- Calculate human error probabilities (HEPs)
- A software tool to implement HEP calculations and documentation
- A method aimed for all HRA applications
- Developed based on IDHEAS-G
- Data were documented in IDHEAS-DATA
- Workshops conducted to evaluate the use for FLEX actions 3
HEP Quantification Elements Element Factors Pt Time sufficiency (Normal pace and performed as planned)
Pc Cognitive errors in performing critical tasks 5 Cognitive Failure Modes (CFMs): Detection, Understanding, Decisionmaking, Action Execution, and Interteam Coordination Error Recovery Credit the resources not available for normal team responses (e.g., extended time available)
Dependency A task failure affects the reliability of the subsequent tasks 4
IDHEAS-ECAs HRA Process Step 1:
Develop scenario narrative Develop scenario timeline Step 1: Determine scenario context Step 1: Identify HFE Step 2: Define HFE PRA model Step 2:
Analyze tasks and identify CT(s) in HFE Step 3: Characterize the CT(s) and select applicable CFMs Step 5: Calculate Step 6: Analyze HFE timeline (subset of scenario timeline, if there are multiple HFEs in the scenario)
Step 4: Assess PIFs applicable to every CFM CFM = cognitive failure mode CT = critical task HEP = human error probability HFE = human failure event PIF = performance-influencing factor PRA = probabilistic risk assessment Step 6: Estimate parameters of distribution Step 6: Estimate parameters of distribution Step 6: Calculate Scenario context and list of applicable PIFs PIF attributes of every CFM for every CT List of CT(s)
HFE and its definition List of applicable CFM(s) for the CT(s) and and Step 7:
Calculate overall HEP
HFE and its definition
= error probability due to CFMs
= error probability due to uncertainty in and
= time available
= time required and = mean and standard deviation of and = mean and standard deviation of HFE and its definition 5
HFEs HEP Quantification Structure 6
HFE Time (Pt)
Cognition (Pc)
Critical Task Detection Critical Task Critical Task Understanding Decisionmaking Action Execution Interteam coordination PIFs - PIF Attributes
Calculate Pt 7
Calculate Pc 8
Critical Task, CFMs, PIF, and PIF Attributes (As Implemented in IDHEAS-ECA Tool)
PIF &
PIF Attributes 9
IDHEAS-ECA Tool Demo 10
Error Recovery & Dependency
- Error recovery: Only credit resources that are normally not available, e.g., extended time available, with combination of credible recovery opportunities
- Dependency: IDHEAS-Gs dependency assessment process 11