Phenomena events

Before the first World Trade Center bombing in 1993 and the 1995 Oklahoma City bombing, emergency incidents were primarily or generally thought to be caused by natural or accidental events. Examples of natural phenomena (events) include wildfires, flash floods, earthquakes, active volcanoes, droughts, and storms. These natural events are not entirely predictable, and they cannot yet be controlled or prevented (Meyer 2004). 

This section identifies natural phenomena events and the likelihood that they will affect operations at TA-V,... 

At least one bounding accident from each of the major types has been selected unless the bounding consequences are low. Accident categories are internally initiated operational accidents (fires, explosions, spills, and criticality) natural phenomena events for the site (e.g. earthquakes, tornadoes) that could affect the facilify and externally initiated, man-made events (e.g. airplane crashes, transportation accidents, and adjacent facility events). Criticality assessments have indicated that criticality is an incredible event for isotope processing operations. Based on these evaluations, criticality has not been included in the hazard analysis and will not be included in the accident analysis. 

This section summarizes the methods used to evaluate and quantify the consequences of operational accidents, natural phenomena events, and external events selected in Section 3.3.2.3.5, Accident Selection as DBAs. Consequences to the public and the environment stem from airborne releases of radioactive material since no liquid or solid radioactive material would be released in the selected accidents. The airborne pathway is of primary interest for releases from nonreactor nuclear facilities according to DOE-STD-1027-92 (DOE 1997). Exposure to direct or scattered radiation is a hazard only for workers due to the distance to the public. 

The Design Basis Earthquake (DBE) is a natural phenomena event, and is based on DOE-STD-1021. During normal HCF operations, the ventilation system maintains a zone-to-zone pressure hierarchy, which controls the migration of radiological contaminants. The normal flow of air sweeps contaminants that are present in contaminated confinement zones (Zone 1 and 2A) through filters, which are designed to capture and retain the contaminants. In the event of a DBE, many of these systems are expected to fail, and the normal pressure hierarchy would not be maintained. 

Categorization Of Natural Phenomena Events For K-Reactor Li Cold Standi And L- And P-Reactor IKsassembty Basins 10.2-1... 

Categorization Of Process Phenomena Events For K-Reactof In Cold Standby And L- And P-Reactor DIsassendify Basins 10.2-2... 

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