GEEE R T. op er E, Operational plans for services such asfengineering, fire, Police, rescue and wardens must provide flexibillty and versatility. The radiation situation may requir@ that personnel of such services for a time perform duties otherfthan those for which they &re primarily trained, or may deny tha performance of those duties. F. The term "shelter" as distinguished frdm "cover" is used to mean construction which is sufficient to affo substantial protection to persons within it, from blast, the 1 effects, and initial and residual radiation. "Cover" refers structures which will offer protection from radioactive fallout, yond the range of other effects. G. Since fallout progresses over & considefPable period of time and its path can usually be predicted within] broad limits, in contrast with the almost instantaneous blast and fhermal effects, eivil defense countermeasures can be adjusted to fhe developing situation and thereby greatly increase survival clances. H. Any evacuation plan to avoid the blast must take into account the availability of shelteg g@nd thermal effects or cover, the speed of movement which can be achieved and the pdssibility of identifying areas of relative safety with reasonatle accuracy. Beyond the probable range of blast and thermal effects, the emphasis should be placed on advising people to seek the most effective cover available (see para V. B 2) and td remain there until the radiation outside has fallen to safe le is. I. People must be informed concerning the ture of the danger and the measures which they can take, inclufling personal Gecontamination. Standing tnstructions must be prgpared and 4ssned by civil defense officials establishing thel procedures which are to be carried out, DOE ARCHIVES