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
Scientific Cognitive Basis for HRA Literature (NUREG-2114)
SACADA and all data sources
- Research, operation IDHEAS General Methodology IDHEAS-experience (IDHEAS-G) (NUREG-2198) DATA IDHEAS Internal IDHEAS-ECA At-power Application (RIL-2020-02)
HRA applications HRA applications 2
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)
Cognitive errors in performing critical tasks Pc 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 PIF attributes of every CFM Scenario for every CT PRA context and Step 5: Calculate model list of applicable Step 4: Assess PIFs Step 1: Determine PIFs applicable to every scenario context CFM List of Step 1: HFE and its applicable Step 7:
Develop scenario narrative definition CFM(s) for Calculate Develop scenario timeline the CT(s) overall HEP HFE and its Step 2: List of CT(s) Step 3: Characterize the Step 1: Identify HFE definition Analyze tasks CT(s) and select applicable Step 2: Define HFE and identify CFMs CT(s) in HFE HFE and its definition Step 6: Estimate parameters and Step 6: Analyze HFE timeline of distribution (subset of scenario timeline, if there are Step 6: Calculate multiple HFEs in the scenario)
Step 6: Estimate parameters of distribution and CFM = cognitive failure mode = error probability due to CFMs CT = critical task = error probability due to uncertainty in and HEP = human error probability = time available HFE = human failure event = time required PIF = performance-influencing factor and = mean and standard deviation of 5 PRA = probabilistic risk assessment and = mean and standard deviation of
HFEs HEP Quantification Structure HFE Time (Pt) Cognition (Pc)
Critical Critical Critical Task Task Task Action Interteam Detection Understanding Decisionmaking Execution coordination PIFs - PIF Attributes 6
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