ska phase 1 system requirements specification - The Square ...

WP2‐005.030.000‐SRS‐002Revision : BIdent Requirement Applicability Parent VerificationSYS_REQ_3720Minimum life time. SKA1 shall bedesigned for a minimum life timeof TBD years, including initialinstallation, testing andcommissioning period.TBDIdent Requirement Applicability Parent VerificationSYS_REQ_3730Availability. The averageavailability of SKA1 during theoperational period shall be betterthan 90% (TBC). Availability isdefined here as being availablefor scheduled observations in atleast one of the supportedoperational modes.TBDIdent Requirement Applicability Parent VerificationSYS_REQ_3740Upgradeability SKA 1 shall beupgradable.TBDIdent Requirement Applicability Parent VerificationSYS_REQ_3750Life‐time extension. Large scalemaintenance and/or an upgradeshall give the possibility to reach alife time of 50 years (TBC).TBD4.5 Maintenance 2Requirements regarding maintenance concept, corrective and preventiveIdent Requirement Applicability Parent VerificationSYS_REQ_3810Full fail rate. SKA1 shall bedesigned to fully fail less than twotimes per year (TBC), the numberdetermined as average over itsoperational period.TBDNote: Full failure is defined here as an unscheduled inability to operate in any observational modefor more than two hours due to malfunctioning of one or more subsystems. The requirement appliesto the period after initial commissioning of the system or any upgraded components.2 Section still to be aligned with Logistic Engineering Management Plan.2011‐02‐14 Page 35 of 58