Meeting: GLAST Preliminary Design Review, January 8-11, 2002
Subsystem: Systems Engineering Response Accepted/
RFA Closed:
RFA Number: 25
Originator: Cliff Jackson, Code 556, 301-286-6862
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(Originator’s initials)
Specific Request:
Re-examine the operational and survival temperature limits prior to the start of component qual testing. Consider whether it is feasible to establish survival limits that are 15 degrees beyond normal operational ranges. This will assure that operational performance 10 C beyond the normal operational range can be verified without significant risk of exceeding survival limits.
Supporting Rational:
Current temperature limits would require testing at or beyond survival limits if a 10 degree margin is applied to the operational limits.
Response:
As part of the on-going effort to define the test levels in the LAT Performance Verification Plan
(LAT-MD-00408 – Draft1). In light of the modified Radiator design and updated thermal requirements the operational and survival limits are being re-established. Currently, the hot-case hot survival limit is at least 15 degrees C beyond the operational limit for all subsystems. The cold-case cold survival limit is at least 10 degrees C below the minimum operational lower limit.