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Sections 4.4.4, Hazard analysis and 4.4.5, Probabilistic safety analysis

Hazard analysis

The applicant shall provide a hazard analysis that has been performed in accordance with the requirements of:

·       REGDOC‑2.4.1, Deterministic Safety Analysis [24]

·       REGDOC‑2.4.2, Probabilistic Safety Assessment (PSA) for Nuclear Power Plants [25]

·       REGDOC‑1.1.1, Site Evaluation and Site Preparation for New Reactor Facilities [26]

The application should describe the analysis of all potential hazards (internal and external), both natural and human-induced. Some examples are:

·       for natural external hazards: earthquakes, droughts, floods, high winds, tornadoes, abnormal surges in water level and extreme meteorological conditions

·       for human-induced external hazards: those that are identified in the site evaluation, such as airplane crashes and ship collisions

·       for internal hazards: internal fires, internal floods, turbine missiles, onsite transportation accidents and releases of hazardous substances from onsite storage facilities

The application should describe the analysis of any potential combinations of the external hazards. It should also consider the potential interaction of external and internal hazards, such as external events that initiate internal fires or floods, or interactions that may lead to missile generation.

For a site with multiple units, the application should describe how the potential for specific hazards simultaneously affecting several units has been taken into account.

Probabilistic safety assessment

The application shall include a probabilistic safety assessment (PSA) conducted in accordance with the requirements specified in REGDOC‑2.4.2, Probabilistic Safety Assessment (PSA) for Nuclear Power Plants [25].

The application should describe how the results of the PSA have been used to identify any reactor facility vulnerabilities. With support from the PSA, the application should also:

·       provide information that verifies the emergency operating procedures will be adequate during commissioning and future operation

·       describe how the results of the PSA provide insights into the severe accident management program, and how these results meet the safety goals

·       describe how the PSA could be used, during commissioning and future operation, to identify any systems for which design improvements or modifications to operational procedures could reduce the probabilities of severe accidents or mitigate the consequences

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