A. Khudoleeva, S.S. Chirayath, and W.S. Charlton,
"Conceptual Development of the Remote Monitoring System for Safeguarding of the Dry Cask Storage Facilities,"
INMM 54th Annual Meeting, 14-18 July 2013, Palm Desert, California, USA.
The diversion of spent nuclear fuel (SNF) is one pathway to
acquire nuclear weapons capability. There are few places where it
can be obtained: nuclear reactor core, wet storage, dry storage and
during SNF transportation. Different types of safeguards tools are
available to monitor fuel inside the core and storage pools.
However, once SNF is removed to dry storage, there is no
non-intrusive option to verify individual SNF assembly attributes.
Moreover there is a lack of efficient safeguard tools for re
verification of dry cask content. The International Atomic Energy
Agency (IAEA) wants the future safeguards systems to be remote in
an effort to reduce the number of on-site inspection wherever
possible. Thus, this study focuses on the development of the
conceptual design for the remote monitoring system (RMS) that would
be able to detect neutron and gamma signal coming from SNF and
detect removal of both central and peripheral SNF assemblies from a
dry cask. A computational approach was used to develop the proposed
RMS. Monte Carlo N Particle transport code (MCNP) was employed to
develop a dry cask model. The ORIGEN-ARP, fuel burn-up and
depletion code, was used to generate a radiation source-term. A
series of MCNP simulations were performed to investigate the
neutron and gamma flux behavior inside and outside the dry cask.
The results of these simulations aided the design of the RMS and
determination of the optimal location for its components. The
proposed RMS design was tested through SNF diversion analysis and,
it was able to detect all considered diversions with non detection
probability less than 5%. It was also shown that false alarm
probability can be reduced to 1% with increase of measurement time,
which will yield a non-detection probability of 0% for all
considered diversion scenarios. In addition to remote operation,
the choice of the detectors and simple operation principal ensures
system robustness and easy signal processing.
Associated Project(s):Conceptual Development of Remote Monitoring System for PWR Spent Fuel Dry Cask Storage