Lifetime reliability and availability simulation for the electrical system of HTTR coupled to the electricity-hydrogen cogeneration plant. (July 2022)

• Record Type: Journal Article
• Authors: Kowal, Karol
• Is Part Of: Reliability engineering & system safety. Volume 223(2022)
• Publication Date: 2022-07
• Subjects: HTTR -- Electrical Facility -- Reliability -- Availability -- Electricity-Hydrogen cogeneration -- Uncertainty -- Fussell-Vesely; Reliability (Engineering) -- Periodicals; System safety -- Periodicals; Industrial safety -- Periodicals; Fiabilité -- Périodiques; Sécurité des systèmes -- Périodiques; Sécurité du travail -- Périodiques; 620.00452
• DOI: 10.1016/j.ress.2022.108468
• Languages: English
• ISSNs: 0951-8320

Abstract

Highlights: Lifetime reliability and availability of the HTTR electrical system was analyzed. Forced Outage Rate of the foreseen HTTR-based cogeneration plant was considered. High reliability of electrical system to supply safety-related loads was confirmed. Integrated framework for lifetime reliability/availability simulations was applied. Alternative reliability models and system design options were created and compared. Abstract: The lifetime reliability and availability for the Electrical Facility of the High Temperature Engineering Test Reactor (HTTR) have been evaluated. The impact of the electrical malfunctions on the Forced Outage Rate (FOR) of the HTTR-based electricity-hydrogen cogeneration has been determined. Normal operation and emergency conditions have been considered for the standard system design and its modified configuration of higher redundancy. The Monte Carlo method has been applied for the uncertainty assessment followed by the Fussell-Vesely importance evaluation. A novel methodological concept has been proposed for the integration of reliability and availability simulations of alternative models corresponding to several options of the system's design considered under various analytical assumptions. It provides a computational framework suitable for the incorporation of the alternative models into one simulation case driven by the common set of reliability data at each iteration step. This enables efficient comparison of the models in terms of reliability, availability, and uncertainty. The results of this work are of high practical importance for the safety and reliability of the HTTR-based cogeneration plant. The former was confirmed by the high availability of safety-related electrical loads, while the latter needs optimization to meet the industry standards concerning FOR.