2.2.11 USS LST-551 At the time of shot BRAVO, LST-551 was operating in an area 30 miles west of Enewetak. At approximately 1000 hours, the ship entered Enewetak Lagoon whereit remained anchored/beached off Parry Island until 3 March, when it left for Bikini. It is assumed that while beached at Parry, the LST-55I1 received the same fallout as the residence islands of Enewetak between 1745 and 2300 hours on 1 March (Section 2.2.1 and Figure 2-3). Shortly after Shot ROMEO was detonated on 27 March, LST-551, which had been beached on Parry Island (Enewetak), got underway for Bikini. At approximately 1500 hours, the ship began receiving a relatively light fallout which peaked at 1900 hours with average topside intensities approaching 3 mR/hr. There is no mention in the deck log of efforts to decontaminate the ship, but by 0800 hours on 28 March, when it arrived at Bikini, intensities were only 0.3 mR/hr (Reference 10). During the night of 28 March and early morning of 29 March, LST~551 was beached on EnemanIsland at Bikini when it received more fallout. At 0315 hours on 29 March, Materia! Condition ABLE was set throughout the ship and the deck log states that it "took rad-safe measures". Intensities at this time were approximately 25 mR/hr. From the deck log, it appears that crew routines during the day of 29 March were not altered by the presence of this contamination. Figure 2-22 depicts the reconstructed radiation environment onboard the LST-551 resulting from Shot ROMEOfallout. The only other radioactive fallout received by the LST-551 while at Operation CASTLE was following Shot NECTAR on 14 May. Although shipboard radiological data was not obtained to documient the NECTAR fallout, it is assumed that while anchored in Enewetak Lagoon on 14 May, the LST-551 received the same fallout as was experienced on the residence islands during the same time period (See Section 2.2.1 and Figure 2-5). The LST-551 made eight trips to Bikini from Enewetak during Operation CASTLE. Specific time periods in and out of the lagoon and integrated intensities for each period as determined from the ship contamination model are as follows: 85