nea le a a personnel, except the firing party, will be evacuated to «oars or“aboardship. Material and equipment not required in recovery operations will be evacuated to Eniwetok. Data and equipment recovery operations will be conducted from afloat or from Enyu. ; i de personnel or material from Fniwetok A aere will be no pre-shot evacuation of @e An emergency capability for post-shot, personnel evacuation of Bikini and Eniwetok Atolls will exist. An emergency post-shot evacuation will be executed only if radiological conditions indicate it is necessary and will be capable of accomplishment on four () hours notice. involve movement of materiel. 2. Such evacuation will not Trailer Locations: a@. The choice of trailer locations has been considered from the point of view of expected blast damage. It has been assumed in these predictions that the trailers will be of thin sheet metal construction, suitably braced inside, dimensions about 35' x 13' x 8', with full length double cargo doors on one end and a smaller personn21 door on one side. Typical contents have been assimed to consist of instrument repair andcalibration facilities, office furnishings, small machine tons, and photographic processing equipment, b. the calculations. The upper limits of the expected yields have been chosen for It is believed that trailers will be safe up to 1.5 or possibly 2.0 p.s.i, Trailers should be safe from external damage with doors open and their smallest areas presented to the blast in order to reduce the area exposed to the high but short durations of wind. However, for protection of the interior, it would be advisable to seal the wit as completely as possible to prevent damage to interior equipment due to wind. If a ventilation system is provided, it should be sealed off since it has been observed that gases at a low level of overpressures flowing through a small opening into an enlarged chamber may behave as compressible flow through a throat or nozzle, with the formation of damaging secondary shock waves. Wheels should be chocked to prevent any tendency to roll. Project officers will have to weigh the above factors in deciding their respective trailer attitudes. The following table is a general guide indicating peak overpressures and velocities to be expected. Detailed studies of specific problems may be requested from J-10, Fran Porzel. COPIED/Dog LANL Rc “he hoe \ Oe