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We gratefully acknowledge J. H. Carlson, F. :X. Gavigan, and W. H. Hannum for their numerous contributions that made this project possible. Also, we extend gratitude toP. M. Lang and R. R. Stiger for their efforts that influenced the results presented. We are grateful to C. F. Miller for prep(lflng the figures for this document.

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or rsprs-ntl that its 11.w wnuld not PREPARED FOR THE ENERGY RESEARCH' AND DEVEUPMENT ADMINISTRATION IDAHO OPERATIONS 'OFFICE UNDER CONTRACT NO. E(10-1-)I375. ' recognition is expressed to J. B. Fussell for his' co~ilributions t o the predecessor of this report. ANCR-1273, portinns nf which are ir~clurlad here, J, L von H o~m n n n and C. F. Millcr provided the sample problern fault tree!: anrl figiire,~ for this report.