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Modeling Common Cause Failures of Thrusters on ISS Visiting VehiclesThis paper discusses the methodology used to model common cause failures of thrusters on the International Space Station (ISS) Visiting Vehicles. The ISS Visiting Vehicles each have as many as 32 thrusters, whose redundancy makes them susceptible to common cause failures. The Global Alpha Model (as described in NUREG/CR‐5485) can be used to represent the system common cause contribution, but NUREG/CR‐5496 supplies global alpha parameters for groups only up to size six. Because of the large number of redundant thrusters on each vehicle, regression is used to determine parameter values for groups of size larger than six. An additional challenge is that Visiting Vehicle thruster failures must occur in specific combinations in order to fail the propulsion system; not all failure groups of a certain size are critical.
Document ID
20140011885
Acquisition Source
Johnson Space Center
Document Type
Abstract
Authors
Haught, Megan (Barrios Technology, Inc. Houston, TX, United States)
Date Acquired
September 18, 2014
Publication Date
June 22, 2014
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
JSC-CN-30604
Meeting Information
Meeting: Probabilistic Safety Assessment & Management Conference
Location: Honolulu, HI
Country: United States
Start Date: June 22, 2014
End Date: June 27, 2014
Sponsors: International Association for PSAM
Distribution Limits
Public
Copyright
Public Use Permitted.

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