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A method of predicting fuel pin lifetimes is described for stainless steel clad mixed oxide LMFBR fuel pins at cladding temperatures below about 1100 exp 0 F. The development of this method required (1) determining empirical relations for in-reactor fuel pin cladding stress and creep rates based on reported strains of EBR-II driver fuel pins, and (2) applying the in-reactor creep equation to mixed oxide fuel pins. Good agreement was obtained between calculated and measured in-reactor creep strain and between an in-reactor strain to failure correlation and observed failures in mixed oxide fuel pins clad with 304 stainless steel. An in-reactor creep relationship for the temperature range 700 exp 0 F to 1050 exp 0 F was developed using reported cladding mechanical strain data for the EBR-II metal fueled, driver fuel pins.