RIL 2024-17, Research Information Letter (Ril) 2024-17, Integrated Human Event Analysis System for Event and Condition Assessment (IDHEAS-ECA) Evaluations of Standardized Plant Analysis Risk (SPAR) Model Human Failure Events
| ML24352A018 | |
| Person / Time | |
|---|---|
| Issue date: | 01/06/2025 |
| From: | Beverly Smith NRC/RES/DRA |
| To: | Jeremy Bowen, Russell Felts, Meena Khanna NRC/NRR/DANU, NRC/NRR/DRA, NRC/NRR/DRO |
| Shared Package | |
| ML24352A020 | List: |
| References | |
| RIL 2024-17 | |
| Download: ML24352A018 (1) | |
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MEMORANDUM TO:
Meena Khanna, Director Division of Risk Assessment Office of Nuclear Reactor Regulation Russell Felts, Director Division of Reactor Oversight Office of Nuclear Reactor Regulation Jeremy Bowen, Director Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation FROM:
Brian Smith, Director Division of Risk Analysis Office of Nuclear Regulatory Research
SUBJECT:
RESEARCH INFORMATION LETTER (RIL) 2024-17, INTEGRATED HUMAN EVENT ANALYSIS SYSTEM FOR EVENT AND CONDITION ASSESSMENT (IDHEAS-ECA)
EVALUATIONS OF STANDARDIZED PLANT ANALYSIS RISK (SPAR) MODEL HUMAN FAILURE EVENTS Enclosed for your information and use is RIL 2024-17, IDHEAS-ECA Evaluations of SPAR Model Human Failure Events. This report captures IDHEAS-ECA evaluations of SPAR model human failure events (HFEs) performed by NRC staff. These evaluations were performed on several of the most risk significant HFEs in the base SPAR model and HFEs associated with the implementation of a selection of the diverse and flexible (FLEX) mitigation strategies. These evaluations provide a good start to building a knowledge base that analysts can leverage in future event and condition analyses (ECAs) using the IDHEAS-ECA Method.
In addition to the IDHEAS-ECA evaluations, this report provides results of benchmarking activities using the human error probabilities (HEPs) for the reevaluated base SPAR model HFEs to determine potential impacts to core damage frequency. Two postulated ECA examples were also performed to provide insights on how revaluated HFEs could result in different risk-informed decision-making.
CONTACT: Christopher Hunter, RES/DRA/PRB 301-415-1394, christopher.hunter@nrc.gov January 6, 2025 Signed by Smith, Brian on 01/06/25
M. Khanna, et al.
2 The report finishes with a summary of conclusions and observations from these evaluations.
The analyst working group also provides recommendations on improvements needed for the IDHEAS-ECA Method and application guidance. In addition, recommendations were also made regarding potential human reliability analysis changes that are not specific to the use of the IDHEAS-ECA Method.
Please notify the responsible staff contact if you have any questions concerning the impending publication of this report.
Enclosure:
- 1. RIL 2024-17
ML24352A020; ML24352A018 OFFICE RES/DRA/PRB NRR/DNRL/NCSG RES/DRA/PRAB RES/DRA/HFRB NAME CHunter MBurton JEvans EBall for SPeters DATE Dec 18, 2024 Dec 23, 2024 Dec 23, 2024 Dec 23, 2024 OFFICE RES/DRA*
NAME BSmith DATE Jan 6, 2025