Use and Development of Probabilistic Safety Assessments at Nuclear Facilities

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This report provides descriptions of the current status of PSA programmes in member countries; including basic background information, guidelines, various PSA applications, major results in recent studies, PSA-based plant modifications and research and development topics.

The objective was to update the previous report, with an emphasis on new developments, general trends and activities of specific interest to the task participants concerning the Fukushima Daiichi reactor accident. As compared with previous versions, the structure and format of the present report is also enhanced so as to better communicate information and insights.

As with previous versions of this report, a “snapshot” is provided of the current situation in member and non-member countries, and hence it includes reference information and various insights of both PSA practitioners and others involved in the nuclear industry.

The report also forms the basis for identifying new tasks for WGRISK.

The main objective of the Nuclear Energy Agency (NEA) Working Group on Risk Assessment (WGRISK), working under the aegis of the NEA Committee on the Safety of Nuclear Installations (CSNI) is to advance the understanding of PSA and to enhance its utilisation for improving the safety of nuclear installations.