J.S. Feener, W.S. Charlton,
"The Impact of Front End Non-Destructive Assay Techniques on Accountancy Systems at Reprocessing Facilities,"
Proceedings of the 51st Annual Meeting of the Institute of Nuclear Materials and Management
, Baltimore, MD, USA, July 11-15, 2010.
Currently available front end spent
fuel non-destructive assay (SFNDA)
measurement techniques have uncertainties that are too
large to be beneficial to the nuclear
material accountancy (MA) system atreprocessing facilities.
Because of this, the containment and surveillance
(C/S) system, alone, has to reach the safeguard goals for
the facility at the front end. A spent fuel
measurement technique with a low enough uncertainty would
allow the requirements of the C/S system to be relaxed.
Extensive work is currently being done on SFNDA measurementsystems.
While this work also has the application to resolve
shipper-receiver differences and accountancy at spent
fuel pools, it could also improve accountancy at
the front end of areprocessing facility. This
work will assist in identifying the requirements of these
measurement techniques to be beneficial to the
MA system. This work also shows the relationship between the
SFNDA uncertainty, MA and C/S nondetection probabilities, safeguard
goals (probability of detection and false alarm
rate), facility throughput, and the material balance
period mainly for the material balance area from the spent fuel
storage area to the input accountability tank. In one example, we
showed that a SFNDA uncertainty of 1.31% could lead to as much as
an 8 times decrease in requirements of the C/Ssystem for a
large reprocessing plant. This could potentially lead to
significant cost reductions.