Effect of delayed link failure on probability of loss of assured safety in temperature-dependent systems with multiple weak and strong links.

Johnson, J. D. (ProStat, Mesa, AZ) ; Oberkampf, William Louis ; Helton, Jon Craig (Arizona State University, Tempe, AZ)

关键词: ACCIDENTS;    PROBABILITY;    SAFETY ENGINEERING;    SYSTEMS ANALYSIS;    FIRES;    TEMPERATURE DEPENDENCE;    TIME DELAY Statistics.;    Links and link-motion.;    Failure analysis.;   

DOI  :  10.2172/910200
RP-ID  :  SAND2007-1907
PID  :  OSTI ID: 910200
Others  :  TRN: US200723%%376

学科分类：社会科学、人文和艺术（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Weak link (WL)/strong link (SL) systems constitute important parts of the overall operational design of high consequence systems, with the SL system designed to permit operation of the system only under intended conditions and the WL system designed to prevent the unintended operation of the system under accident conditions. Degradation of the system under accident conditions into a state in which the WLs have not deactivated the system and the SLs have failed in the sense that they are in a configuration that could permit operation of the system is referred to as loss of assured safety. The probability of such degradation conditional on a specific set of accident conditions is referred to as probability of loss of assured safety (PLOAS). Previous work has developed computational procedures for the calculation of PLOAS under fire conditions for a system involving multiple WLs and SLs and with the assumption that a link fails instantly when it reaches its failure temperature. Extensions of these procedures are obtained for systems in which there is a temperature-dependent delay between the time at which a link reaches its failure temperature and the time at which that link actually fails.