mes ie SOCAN * aan oe ware TRB Safeing 7 Criteria - (1) alpha is never posttive} (2) alpha does not become positive before ine systen aisassenbles, 4,e, before about forty goneretions| (3) the nuclear explosion resulting from a one point detonation should not exceed that.“possible with the normal HE load carried by the alrerafts | (4) "safety by probability", i.e, that the net estimate of the compound probability for the sequence of events leading to an accidental nuclear explosion be accéptably small, Dr. Schreiber favored (3), as a workable, driterions “It would req x oh tt that the. maximm accidental nuclear yield be less than about or] ao ‘yr . A calloulation has been nade for theRSTHdeolen on the assumptions that 40% of thie normal energy goes into the heavy metal, the metal system 1 SS preserves sptiericad symmetry, and the time of implosion is increased aa ee — over nornal bh a factor L; 6 (inverse square root of E). The result of the caleulatich ds that a 100 tog bangwouldresult from one point of ae detinabion, hence that the ERX. <5 not nuclearly safe by this critericn. tye . The essumptions of the calculation are conservative 3 however, end the on accidental yield of theKECToui probably not actually exceed ee re ae cesible Dr. Schreiber said that ‘an experimental cne point detonation test world vooe probably be proposed eventually. aa Inprove- eee ie ‘the 30 KT Region At this point there was a trief coffee break. Next, Dr. MacDougall spoke on ideas for improvements in the 30 K™ region. The present es has the following cheracteristics: ee weight 1600 lbs, yield about 30 KT, equivalent oralloy pec