Unirradiated Direct Use (UDU) material (Pu, including MOX, and HEU) is the most proliferationsensitive nuclear material. Safeguards measures must take into account that access to significant quantities of UDU would allow a potential proliferator the quickest route to developing nuclear explosive devices. In the move towards integrated safeguards (IS) it will be necessary to develop IS inspection schema for facilities that contain UDU. This paper will examine the possibility of IS inspection schema taking full advantage of the flexibility allowed under IS including increased reliance on randomised inspections (whether unannounced or allowing for shortened notice periods). Issues addressed by this paper include: ? Average inspection frequency; ? Calculation of mean time to detection under a variety of assumptions; ? The possibility of determining optimal inspection strategies
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