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This short note provides some additional insight into how the HARP program works. In some cases, it is possible for HARP to tdm away too many states and obtain an optimistic result. The HARP Version 7.0 manual warns the user that 'Unlike the ALL model, the SAME model can automatically drop failure modes for certain system models. The user is cautioned to insure that no important failure modes are dropped; otherwise, a non-conservative result can be given.' This note provides an example of where this occurs and a pointer to further documentation that gives a means of bounding the error associated with trimming these states. Butler, Ricky W. and Hayhurst, Kelly J. and Johnson, Sally C. Langley Research Center NASA/TM-1998-208427, NAS 1.15:208427, L-17684 RTOP 522-33-31-01...

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