SYSTEMS-THEORETIC HAZARD ANALYSIS OF DIGITAL HUMAN-SYSTEM INTERFACE RELEVANT TO REACTOR TRIP
Human-system interface (HSI) is one of the key advanced design features applied to modern digital instrumentation and control (DI&C) systems of nuclear power plants (NPPs). Conventional design is based on a compact workstation-based system within the control room. The compact workstation provides both a strategic operating environment while also a convenient display for plant status information necessary to the operator. The control environment is further enhanced through display panels, visual and auditory alarms, and procedure systems. However, just like the legacy control, the HSI should incorporate diversity to demonstrate sufficient defense-in-depth (DiD) protection against common cause failures (CCF) of the safety system. Furthermore, the vulnerability of the HSI is affected by a plethora of factors such as human error, cyber-attacks, software CCFs, etc. that complicate the design and analysis. Therefore, this work aims to identify and evaluate existing system vulnerabilities to support the licensing, deployment, and operation of HSI designs, especially the functions that are relevant to reactor trip. Systematic hazard analysis is performed to investigate potential vulnerabilities within the HSI design by applying a novel approach deemed REdundancy-guided Systems-theoretic Hazard Analysis (RESHA). This method was developed and demonstrated by Idaho National Laboratory (INL) under a project that was initiated by the Risk-Informed Systems Analysis (RISA) Pathway of the U.S. Department of Energy?s (DOE?s) Light Water Reactor Sustainability (LWRS) program. The aim is to develop a strong technical basis for risk assessment strategies to support effective, reliable, and licensable DI&C technologies.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- DE-AC07-05ID14517
- OSTI ID:
- 1891903
- Report Number(s):
- INL/CON-21-61827-Rev000
- Resource Relation:
- Conference: 12th Nuclear Plant Instrumentation, Control and Human-Machine Interface Technologies, Virtual, 06/14/2021 - 06/17/2021
- Country of Publication:
- United States
- Language:
- English
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