Usually the. Atouic Defense Bill was besed: on the standard pill for the type shiv. The type standard was satiafectory in ell ceases. However, a supplement, detailing directions on operation of the weashdow syated, wes required for eech ship. | A serious problem encountered by ell ships is now to oparrte the engineering plent in heevy falloutwithout excessive centanination of the engineering specos. Large volumes of eitr are necessary ta cool some of these spaces, aspecially when operating et or. near full power, &8 would very likely be dome in battle. In many ships the @ir required by boilers and dicsel cnginsa is drawn from the engincOring speco rather them from topside, necossitating a Large flow of air through the cnginering epece. Nevertheless, in CaSTLa, even with tho -asndo-m systems in operrtieon the enginccring apaces of skins wore contaminated mich less then the weather decks, end, in gonerel, enginecring personnel recoived less rediation then deck personnel. These results mi-ht not heve been obtained had the ships becn operating in fallout et full cower. In the absence of scientific confirmetion, the following conjocturea are made: e. lLerser redioective perticles are not draw into enzineering speces due to their aize end weight. db. A&A large proportion of the smeller raciorctive prrticles which are dravn into enginecring speces are expelled through the exhaust systoms, boilers and dicsel engincs. C. Rc‘ioactive particles are sossibly trapped in the washdewn . spray ond washed overboard instead of entering with the air. ST ee-5