Hazard area envelope

Figure 7. The meandering Gaussian plume. The cross-section of the time-averaged tracer concentration has a normal or Gaussian distribution, as does the hazard area envelope within which the actual plume is to be found. The latter is obtained by including the large-scale fluctuations in the time-average of the tracer concentration (after Gifford, 1959)...

The analysis also gives consistent expressions for the Gaussian variances defining the hazard area envelope resulting from a meandering plume, e.g. Figure 7. 

Hazardous substances may be protected from microbial attack by physical or chemical envelopes. These protective barriers must be destroyed mechanically or chemically to produce fine particles or waste suspensions to increase the surface area for microbial attachment and subsequent biodegradation. Another way to increase the bioavailability of hydrophobic substances is washing of waste or soil by water or a solution of surface-active substances (surfactants). The disadvantage of this technology is the production of secondary hazardous... 

The operations of the K-Reactor Purification Area and the K-, L-, and P-Reactor Disassembly Basins have been examined in this BIO to ensure the adequacy of tiie safety envelope, and to develop and promulgate any new requirements ensuing from the Preliminary Hazards Analyses and the Hazards Assessment Documents. The existing K-, L-, and P-Reactor Technical Spedfications were also reviewed. The review revealed the need for new admimstrative controls to preserve the safi ty anatytis assumptions. 

It is common practice to have more than one design basis earthquake associated with each hazard level, SL-1 and SL-2, each one representative of a potential seismogenic area. All of these should be considered in the design, and appropriate enveloping should be carried out on the results. 

The basic steps involved in an external flooding analysis are similar to those followed for internal flooding in the individual plant examination. However, the focus of attention is on areas, which due to their location and grading may be susceptible to external flood damage. This requires information on such items as dykes, surface grading, locations of structures and locations of equipment within the structures. It is expected that the generic envelope will bound site hazard parameters. 

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