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About This Item
Full Description
This standard is limited to analyzing the progression of severe accidents from the onset of core damage through radionuclide release to the environment or a determination that a release to the environment will not occur. It includes the analysis of the various phenomena that occur inside the reactor vessel, the containment structure, and neighboring structures that might participate in the radiological release pathway to the environment. This analysis involves carrying the postulated accident sequences from a Level 1 PRA through a probabilistic logic structure such as a containment event tree (CET) (or equivalent) and determining the radionuclide release characteristics (e.g., magnitude and timing) for the various pathways through the CET. This standard includes accident sequences initiated by internal events, internal hazards, and/or external hazards addressed in ASME/ANS RA-S-1.1-2024. It also includes postulated accident sequences initiated from all modes of reactor operation (at-power, shutdown, and transition states) addressed in ASME/ANS-58.22-2014 (Shutdown PRA Trial Use Standard).
Document History
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ANS RA-S-1.2-2024
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Severe Accident Progression and Radiological Release (Level 2) PRA Standard for Nuclear Power Plant Applications for Light Water Reactors (LWRs)- Most Recent
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ANS RA-S-1.2-2014
Severe Accident Progression and Radiological Release (Level 2) PRA Standard for Nuclear Power Plant Applications for Light Water Reactors (LWRs) - ASME/ANS RA-S-1.2-2014 (Trial Use Standard)- Historical Version