Abstract
The special topics presented in this chapter are related to the in Probabilistic Safety Assessments (PSA) level 1, which is evaluating the risk impact considering that the reactor is damaged. The tasks are presented in the approach mentioned in the introduction and in the order of their flow path during the performance of such a study, i.e.: (a) How the input to the PSA model is prepared and which are the main challenges? (b) The screening of the hazards and the evaluation of the considered challenges to the NPP (Initiating Events), possibly leading to risk increase; (c) The development of the databases for failures of components and frequencies of the initiators; (d) Description of the plant reaction to the challenges by modeling it in a series of event trees for the chosen list of initiators in the previous tasks; (e) Description of plant barriers to the challenges identified in the event trees; (f) Integration and quantification general approach and special aspects of this task for internal/area or external events in NPP unitary models. Uncertainty and sensitivity analyses of PSA level 1, as basic information for further use of results in the decision-making process.
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Serbanescu, D., Ulmeanu, A. (2020). Special Topics in Probabilistic Safety Assessments (PSA) Level 1. In: Selected Topics in Probabilistic Safety Assessment. Topics in Safety, Risk, Reliability and Quality, vol 38. Springer, Cham. https://doi.org/10.1007/978-3-030-40548-9_2
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