Technical implementation in support of the IAEA`s remote monitoring field trial at the Oak Ridge Y-12 Plant Page: 3 of 6
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A description of the system will be provided and
then the components of the system will be discussed
in greater detail.
The RMS design is shown in Figure 1. Tray #1
includes a radiation measurement and a container ID
for the individual containers. Tray #2 includes two
radiation measurements and a container ID for each
container. In addition, both tubes include two active
seals and motion detection technologies for access
monitoring to each tube.
Sensor data is transmitted by a radio frequency link
from the motion sensors and the tray #1 radiation
sensors to a receiver. The rest of the sensor suite
and the receiver are hardwired to the LONWorks
The LONWorks network forms the backbone of
sensor data transmission and collection at the data
node. The data node is interfaced to a Data
Acquisition System (DAS) computer for local data
display and storage.
The DAS is interfaced to off-site communication for
data transfer to the IAEA Headquarters in Vienna,
Austria; to the IAEA field office in Toronto,
Canada; to Oak Ridge facilities; and to Sandia
facilities for data review and analysis. Two forms of
communications will be evaluated during the field
trial. Commercial telephone dial-up will be
available for all of the facilities to use. Also, a
satellite link will be available from the Y-12 storage
facility to the IAEA headquarters. Each facility has
a Data and Image Review Station (DIRS) available
for the data review and analysis.
The sensor technologies will be discussed in four
areas; tray #1, tray #2, access monitoring, and video
Tray #1 includes radiation attribute measurements
and a container ID for each container within the
tube. The radiation sensor is the Oak Ridge
RadCouple sensor. RadCouple is a gross gamma-ray
detector that functions similarly to a thermocouple;
i.e., with a constant voltage placed across the
photodiode, the current varies directly with gamma-
ray radiation flux. The detector head is composed of
a cesium iodide (CsI) crystal optically coupled to a
photodiode. The detector head and electronics are
connected in multiples of three to an Authenticated
Item Monitoring System (AIMS) radio frequency
(RF) node for transmission to the AIMS receiver and
interface to the LONWorks network.
The container ID is an implementation by Aquila
Technologies Group (ATG) of the Dallas
Semiconductor touch memory devices. ATG has a
commercial implementation of this technology
available as the AssetLAN. A touch memory device
is attached to each stored item for identification. The
touch memory device is connected to a unique
addressable switch for the particular container
position with the tray. The addressable switches are
interfaced to a LONWorks node. The node contains
intelligence to provide periodic monitoring of the
status of containers. Messages resulting from the
monitoring include faulty interconnections of the
touch memory devices and the addressable switches,
missing or new touch memory devices (implying
missing or new containers), and a State of Health
message indicating general status of the sensor and
node combination. The node is then interfaced to the
Tray #2 includes two radiation attribute
measurements and a container ID for each container
within the tube. One radiation sensor is the Oak
Ridge RadCouple sensor. RadCouple is the same
sensor unit as described in tray #1. However, the
detector head and electronics are wired directly to a
sensor concentrator panel that digitizes the signal and
transmits the radiation data through the LONWorks
network to the central data acquisition system (DAS).
The second radiation sensor is the Oak Ridge RadSiP.
RadSiP is a single p-i-n diode that is capable of
energy resolution for gamma ray energies up to
approximately 100 keV. The RadSiP sensor is
composed of a Si p-i-n diode, a preamplifier and
pulse height discriminator. The gamma radiation flux
that is measured results from the Compton scattering
from the 186 keV gamma ray interacting with the
silicon. The magnitude of the flux in the energy
bandwidth measured is directly proportional to the
enrichment of the uranium. RadSiP serves as an
independent gamma-ray measurement to that of the
RadCouple because the sensors provide two different
methods of measuring radiation attributes of the
uranium. The RadSiP sensor is directly wired to a
sensor concentrator panel that transmits the data
through the LONWorks network to the DAS.
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Corbell, B.H.; Moran, B.W.; Pickett, C.A.; Whitaker, J.M.; Resnik, W. & Landreth, D. Technical implementation in support of the IAEA`s remote monitoring field trial at the Oak Ridge Y-12 Plant, article, August 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc673279/m1/3/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.