in raising the SIO probe eboard the YAG-39 prolonged thisevent.
The Horizon
departed and the YAG~39 continued to keep station on the drogue.
After
considerable difficulty in lowering and raising the SIO probe, a technicue
of stopping the ship during this measurement was adopted but by 1&00 the
gear was no longer operable and after taking a final set of water samples
this ship departed for Eniwetok at 2054.
Throughout the time from the beginning of fallout to the return to
Eniwetok, the ship was closed and personnel remained in shielded spaces except
as necessary to acccmplish ship end project work.
Due to the numerous events,
the radiological situetion and washdown operation ere best presented in a
cnrcnological table.
O7L7
0753
0828
0853
1100
1245
1530
1550
1635
1703
1941
2050
2125
2135
2158
2240
2325
2345
Fallout arrival
Washdown on
Washdown off. Men to TV camera at mast head and to release
jammed limit switch on SIO rrote hoist.
VWashdown on
Peak activity on fore deck of 27 rf/hr
Estimated time of cessation of principal fallout. The Cepteain
observed from the bridge that washdown nozzles on the top of
house (flying tridge) were probebly closed.
Turned washdown off. Took air sample--well above tolerance-noted much loose material on deck. Valves controlling nozzles
on top of house opened,
Washdown on
waskdown off. Drogue leunched and took water samples.
Washdown on
Washdown off. Took air sample--searched for and found drorue.
Washdown on
Washdown off to sicht drogue
Washdown on
Washdown off--took water samples.
Washdown on
Washdown off to sight drogue.
Washdown on
T+1 (22 July 1956)
0020
Washdown off to sight dropue
0210
Washdown off. Took water samples, opened engineroom vents and
hatch.
At meal time only, starting with breakfest, the two aft passage
way doors on the main deck were opened to provide ventiletion
and reduce the high ambient temperatures in the galley, After
:
:
;
‘
i
opening
the ensineroom
ventilation,
shoe covers end d ¢ gloves were
recuired in the engine room. The engineroom door wes kept clos ds
0026
Notes:
Cr PIEN 5A
~PIED/ OGE
BNL RO >
Washdown on
-~19-