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Unattended Monitoring Systems

Unattended monitoring systems provide an onsite inspection task 24 hours a day, 365 days a year without requiring a human inspector.   Table 12 lists unattended monitoring systems used for spent fuel, the detection method of the system, and a brief description.

Table 12. Unattended monitoring systems for spent nuclear fuel

Unattended Monitoring System Detection Method Description
Unattended Spent Fuel Monitor (UFSM) Gross γ and neutron counting Monitors spent fuel movement from the reactor to the storage pond and out of the storage pond
Mobile Monitoring System for Container Transport (MMCT) Gross γ and neutron counting Monitors spent fuel transfer on railcars. Integrates radiation detection with video surveillance and GPS location equipment as well as smart power management technology
CANDU VXI integrated fuel monitor (VIFM) Gross γ and neutron counting Monitors spent fuel bundle discharge through 3 subsystems: VIFC, VIFB, and VIFD
CANDU core discharge monitor (VIFC) Gross γ and neutron counting Detects CANDU fuel bundles as they are discharged from the side of the reactor
CANDU spent fuel bundle counter (VIFB) Gross γ counting Monitors strategic locations on the CANDU spent fuel bundle pathway
CANDU VIFM 'yes/no' monitor (VIFD) Gross γ and neutron counting Monitors CANDU spent fuel bundle discharge through bundle pathway access ports
Silo Entry Gamma Monitor (SEGM) Gross γ counting Monitors the loading of dry storage spent fuel containers into a final silo storage location
Mobile Unit for Neutron Detection (MUND) Neutron counting Fully enclosed neutron detection system that can collect data on battery power without service for over 8 weeks
(Source: Ref 10)

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