ke
Maintenance of the RAD LAB equipment will be accomplished by the ERDA
1
The RAD LAB facility, including an instrument maintenance trailer, will be
m.
ERDA will be responsible for establishing, ordering and storage requirements
contractor maintenance facility.
located on existing pads number 46, 47, and 48 on Enewetak(Fred)Island.
and a distribution schedule for liquid nitrogen.
(Field in-situ operations and Pu survey criteria are described in the following sections
from the OPLAN. Chapter 3 of this report documents actual field in-situ operations while
Pu criteria are discussed in Section 2.2.4 of this report.)
FIELD IN SITU OPERATIONS
l.
GENERAL: Thein situ van is a mobile soil assay system in a tracked vehicle. It is
self-contained to the extent that all radiological data can be acquired and most of the
data processed by the in situ van in the field.
Final data processing and map overlays,
ete., will be done in the Data Reduction Trailers on Lojwa (Ursula)* and Enewetak (Fred).
2.
CONCEPT OF OPERATIONS:
a.
The in situ van is designed to detect gamma-ray emitting radionuclides in the
soil, It will accomplish this by means of a solid state radiation detector suspended above
the soil by means of a boomat the rear of the vehicle. A complete survey of an island will
require roughly ten to one hundred measurement locations depending upon the island size.
These measurement locations will initially be spaced 50-100 meters apart in an
approximately rectangular grid covering an island.
To facilitate access, measurement
locations may require some clearing and will be identified by survey markers. These
locations will eventually be referenced to a permanent set of coordinates for
documentation.
b.
°
Initially,
the
undisturbed
soil
will
be
looked
at
in
an
area
cleared
of
vegetation.**. This will allow a decision to be made concerning location and extent of soil
removal operations. Additional measurements will be made after each soil lift to plan
future work. Finally, a set of measurements will be made to document the radiological
condition of the islands at the termination of cleanup operations.
3.
CONDUCT OF OPERATIONS:
a.
<A typical sequence of operations would be:
(1)
Offload in situ van from inter-island transport boat.
(2)
Drive to first measurement location,
(3)
Deploy boom and detector to operating position (approximately 10 meters
(4)
Acquire data. (Acquisition time will vary.)
(5)
Seeure boom and detector.
above soil surface).
(6)
Drive to next location. This typical sequence is expected to result in an
overall average rate of one measurementlocation per hour.***
*Data processing and construction of maps and overlays was all done by DRI in the Enewetakfacility.
**Early experience indicated that vegetation could not be economically cleared without disturbing
the soiL See Chapter 6 for details on vegetation clearing.
***In average circumstances, two locations per hour were measured.
E-9
een el
{Annex C, App. 2,Tab E)