Development of a potential initiator impacts table for ITER safety analyses

Selection of bounding events for ITER DFLL-TBM safety analysis

“…A PIE-PIT is a matrix that shows the potential impact of every postulated initiating event by considering inventories of radioactive material, confinement barriers and functions that protect them [14][15][16]. PIEs are deployed in rows, plant confinement states in columns and cells are filled with sequences of codes representing the aggravating failures that would have to occur for the PIE to result in the defined plant confinement state.…”

Progress in the development of a PIE-PIT for the ITER Tokamak

“…The term 'aggravating failure' is initially used in [2] to define any failure that needs to occur for the sequence to result in the identified Plant Confinement State. These comprise loss of integrity, malfunctions, failures to isolate or failures of monitoring systems among others and includes both independent faults and failures occurring as a consequence of the accident sequence.…”

“…At the end of 2002, a new PIE-PIT was developed by Taylor et al [2] in order to show consistently the potential for initiators in Tokamak systems to lead to some kind of hazardous Plant Confinement State during normal operation (i.e. not in a maintenance period).…”