Present Issues of Conversion of the Results of a Level 1 Probabilistic Safety Analysis into Input Data for a Level 2 Probabilistic Safety Analysis
The recommendations of the regulatory documents of Rostechnadzor and the IAEA related to the formation and use of plant damage states (PDS) in level 2 probabilistic safety analysis (PSA-2) are analyzed in the article. The PDS attributes in PSA-2 models are considered as well as methods for transformations of level 1 probabilistic safety analysis (PSA-1) results in the input data for PSA-2 in the continuous model and separated model that is based on PDS. The example of the construction of continuous PSA-2 model without PDS formation and the model that is based on PDS is provided. The advantages of continuous model are demonstrated.
The recommendations of RB-044-18 on the use of PDS are analyzed in the article. Provided is the conclusion on the usefulness of the update of the RB-044-18 aimed to account for different approaches for PSA-2 model development, in particular, inclusion of recommendations, the development of continuous PSA-2 models without necessity for PDS formation and inclusion of recommendations for selection of beyond-design-basis and severe accidents scenarios in support of PSA-2.
► Keywords: level 2 probabilistic safety analysis, plant damage states, severe accidents progression event tree, continuous and separated models.
The article is published for discussion purposes.
The editors’ crew of the journal would be grateful to the authors of articles for alternative opinions on this topic.
Article language: Russian. Pp. 25–42. [in Russian]. DOI: 10.26277/SECNRS.2026.119.1.002.
Present Issues of Conversion of the Results of a Level 1 Probabilistic Safety Analysis into Input Data for a Level 2 Probabilistic Safety Analysis
Authors:
Lyubarsky A. V. , Bredova V. A. , Berg T. V. , Morozov V. B. , Tokmachev G. V. , Fedulov M. V.
Issue:
1 (119) – 2026.
