This 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 and similar design make 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.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Modeling Common Cause Failures of Thrusters on ISS Visiting Vehicles


    Contributors:
    M Haught (author) / G Duncan (author)

    Publication date :

    2014


    Size :

    8 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English








    Common Cause Failures and Ultra Reliability

    Jones, H. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2012