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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

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