mee IES CE CREE mL BOTDaaINI y¥ a 4 23. Tritium Production. Based on an over-all appraisal of the needs of the thermonucleer program, fission weapon development, for weapons, the possibilities in and fPissionable material requirements the Commission dccided, with the concurrence of the Department of Defense, (a). to discontinue the enriched U-235 loading of the H pile at Hanford for tritium production, (b) to continue to use the excess reactivity of pile H, or its equivalent, for tritium production, end (c) to use the excess reactivity in four of the Hanford piles, the production of uranium 233, or the equivalent, for discussed latcr, Fission Weapon Development 24. Condensed development sehedules for the several fission models arc shown in the adjoining chart. and progress of work on fission weapons, The status by weapon model is as follows: Mark 5. oe 25. (Imploston-type bomb; outside diameter 45 inches; approximate weight 3,100 pounds) Production of components has been in progress for several months, Weapon operability will be dependent on deliveries of the associated test and handling equipment required for this model, Tn general, design of test and handling equipment for a given weapon cannot be frozen until destgn of the weapon has been finally established; hence,’ preduction of the associated equipment, much of which is special electronic apparatus, tends to become the controlling factor in achieving stockpile operability. will begin in Februery 195°, is May 5, Initial stockpiling of bombs and the operational stockpile date 195°, 7 TTS SECINE TI AlALTE LE So