Operaticn plan. CTG 7.3 No. 1-53 Joint Task Force SEVEN Task Greup 7.3 . Washington 25, D. C. 7 December 1953, 1200R Aprendix V to Annex G Additicnal RadSafe Measures Directed for Shot Times l. If decks and structures are kept wet prior to fallout there is less like- lihood of radioactive fallout being absorbed into porous materials and cracks. 2. In addition to RadSafe Instructions listed elsewhere, it is directed that all ships within eighty miles of the shot site from D Day to D/2 day observe the following procedures: a. From H/10 minutes to H+ heurs: (1) Clear topsides of all non-essential personnel. (2) Close all doors, hatches, and ports from topside to the interior of the ship. (3) Continue to operate the ventilation systems at the discretion of the Commanding Officer, but monitor air coming from topside. (4) Keep the washdown equipment ready for immediate use. (5) Maintain the topside in a wet condition by continuous or intermittent use of the washdown system. In order to avoid grounding numerous antennas, ESTES shall not use the washdown system until and unless fallout is detected. (6) Maintain a constant watch for radioactive fallout on topsides except when washdown system is turned on. b. From H4L hours to HLS hours (1) Keep the washdown system ready for immediate use, except when this interferes with essential ship activities. 3. AQ TG 7,3 ships in the “=NINETOK/BIKINI Danger Area shall: So tete ‘ a. From H44 hours to H436 hours, check the topsides for radioactive fallout every twenty minutes. b. From HY36 hours to H/72 hours, check the topsides for radioactive fallout every hour. c. From H/72 hours to D plus7 days; check the topsides for radioactive fallout every four hours. dad. Maneuver to avoid rainfall and low clouds, as practicable.