Unreviewed Safety Issue (USI)
Unreviewed Safety Issue (USI) : A USI [for an Accelerator Facility] exists if a proposed change, modification, or experiment will either: (1) significantly increase the probability of occurrence (through reduction in the margin of safety or otherwise) or the consequences of an accident or malfunction of equipment important to safety from that evaluated previously by safety analysis; or (2) introduce an accident or malfunction of a different type than any evaluated previously by safety analysis which could result in significant consequences
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