mooring had to be instailed at a distance m awout ¢ miles fron the previous mooring.
e wgecovery of instruments and records after each shot was started on the morning of
D+1 and
ually required 2 to 3 days for the complete recovery and rearming operation.
us
1.5 INSTRUMENTATION
The instruments used for the collection of fallout and for measuring fallout time of arrival
these stations were supplied and maintained by Project 2.63.
at The instrument designed for determination of early penetration from
the deep moored Stations,
the penetration meter, is described in Chapter 2.
The instruments and the components for installing and maintaining the instrument skiffs are
tally described in Appendix B.
4.6 RESULTS AND DISCUSSION
4.6.1 Summary of Shot Participation. The skiff stations were activated for participation in
five shots. Tables 4.1 through 4.5 summarize instrumentation of these stations. For results
of fallout measurements and sampling, see Reference 7.
Shot Cherokee (Figure 4.4).
were installed north of the atoll.
Seventeen stations were activated. Sixteen of these
The seventeenth was placed south of Site Tare for subsequent
were recovered in the west sector before damageto the in-.
stations
Six
Zuni.
use during Shot
strument skiff-retrieving ramp interrupted the recovery program. None of the time-of-arrival
devices (Project 2.63) was triggered. No further stations were recovered, owing to the time
required for repairs on the ramp.
Shot Zuni
(Figure
4.5).
Sixteen stations were activated.
ings were cecovered from fourteen of these stations.
Samples and radiation read-
Station AA had been run down, andStation
VV had capsized probably from the shock waves. Station VV was in the mooring installed south
of Site Tare especially for this shot; consequently, the only records south of the atoll were lost.
The capsized skiff was recovered, and the mooring was abandoned after this shot.
Shot Flathead (Figure 4.6). Fifteen stations were activated. Samples and readings
were recovered from fourteen of these stations. Station MM was never located.
Shot Navajo (Figure 4.7). Thirteen stations were activated. Samples and readings
were recovered from all of these stations.
Shot Tewa (Figure 4.8). Seventeen stations were activated. Three were new stations
WwW, XX, and YY, moored just prior to the shot to allow better coverage to the west. Samples
and readings were recovered from all these stations.
4.6.2 Summary of Moorings and Problems Encountered. The main objective of the deepmooring work was to install moorings that would maintain instrument platforms lasting for the
‘ength of the operation.
Seventeen moorings were put in, starting about the middle of April. At the termination of
this series of tests, eight of the original moorings were still in use. Station VV was required
‘or Shot Zuni only and was abandoned after that detonation. The other eight moorings were replaced, some several times. The stations most frequently replaced appeared to coincide with
the area of heaviest surface traffic, which was not surprising in view of the difficulties encountfred during Operation Wigwam. In all, a total of thirteen remoorings was made. There were
Several causes for these stations’ failures. Skiffs adrift from four of these stations were reCOVered. Two of these indicate the station was run down by larger vessels, as evidenced by
damage to the skiff and the nylon pennant. The other two skiffs recovered hadall but a few feet
of their full nylon pennant, indicating the possibility of chaffing at the deep float. Air search
located the wreckage of another skiff, which had apparently been run down.
ere laid during this series of tests.
_
In all, 33 moorings
After the series, recovery of the subsurface float and a short length of the 0.120-inch moor-
‘Ng wire was attempted to aid in the evaluation of the mooring system.
97
Three such assemblies