€ ae, } 3 pool of water seems to have vented into the cavity or tunnel, causing ¢ontaminated steam to permeate that entire tunnel system. This may delay work in that tunnel complex for a few weeks. | It is important to recall that nuclear technology is a rapidly changing science -- that surprises are in store. It is important that our opponents not be the ones to make the first major discoveries and we can assume that their present test series include testa of the advanced ideas they have been able to develop over the past three years. It is also important to recall the major surprises the United States has had in every test series, ond that major steps. can be taken only by testing. The present Sovietteste could easily put them ahead of the United States in important areas, and by testing above the surface with large yields they have a substantial advantage in ease of experimentation end rate of progress under present circumstances, In the past the Atomic Energy Commission - Department of Defense in conducting their experiments on the surface, underground, in the atmosphere, and in the oceans have developed operational procedures which have assured the public health and safety. These were accomplished by appropriately controlling areas of fallout or other disturbance, by development of reliable prediction methods, by using explosive yields as small as possible consistent with the experimental objectives, and by limiting the number of explosions to these required for development or effects data. A great deal can be accomplished to Nok limit contamination through the firing of scaled-down versi x od The safety record is extraordinary, en wee —— ee eee Future tests will be given the same careful consideration as in the past. The amount of radioactivity released will be limited to a minimum and in all cases will be very much below the concentrations at which there {s judged to be a public health and safety hazard. ; $ n) M(7 136

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