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Safeguarded Nuclear Materials in SNF

SNF may contain several types of nuclear material requiring IAEA safeguards.  Table 6 gives the IAEA classifications for the safeguarded material in SNF as well as the associated IAEA timeliness detection goal and IAEA significant quantity.  

Table 6. IAEA Safeguards Basis for Spent Nuclear Fuel

IAEA Classification for SNF Materials Timeliness Goal Significant Quantity
Type Designation Category Form
Pu Special Fissionable Material Irradiated Direct Use Material Item 3 months 8 kg total Pu contained in the SNF
U-233 (Thorium Fuel) Special Fissionable Material Irradiated Direct Use Material Item 3 months 8 kg total U-233 contained in the SNF
LEU (U-235) Special Fissionable Material Indirect use material Item 1 year 75 kg of U-235 contained in the SNF
Thorium (Thorium Fuel) Source Material Indirect use material Item 1 year 20 tons Thorium contained in the SNF

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