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Nuclear Safeguards Education Portal

Material balance period (MBP)

Under an INFCIRC/153-type safeguards agreement*, the term is used to refer to the time between two consecutive physical inventory takings (PITs) as reflected in the State's material balance report. Under an INFCIRC/66-type safeguards agreement, the term is used to refer to what more accurately should be called the book balance period, since the beginning and the ending dates of the period are not necessarily linked to PITs.