General Requirements - std102294

DOE-STD-1022-94

for determining the wind speed of each tornado based on the damage observed. The scale is divided into 13

numbers although no F-6 or greater tornadoes have been observed.

Wind Speed A scalar quantity used with respect to averaging time, ground terrain, and height above ground.

Wind speed can be described in terms of peak wind, mean wind, fastest mile wind, or 3 second gust. Unless

mentioned otherwise, 3 second gust wind speed quantity measure is used in model building codes and national

consensus standards. Each of these terms has a unique meaning:

Peak wind speed is the maximum instantaneous value of the wind speed recorded. Peak wind speed

generally occurs in a 1 to 3 second gust.

Mean wind speed is the value of the wind speed averaged over some time period, usually 1 or 10

minutes.

Fastest-mile wind speed is defined as the highest sustained average wind speed based on the time

required for a mile long sample of air to pass a fixed point.

3 Second gust is speed at 33 ft. (10m) above the ground in Exposure C.

4. GENERAL REQUIREMENTS

The meteorologic, hydrologic, geologic, seismological and geotechnical characteristics of a site and

its environs shall be investigated in sufficient scope and detail to provide reasonable assurance that

they are sufficiently well understood to permit an adequate evaluation of the proposed or existing site,

and to provide sufficient information to support the evaluations required by other DOE standards (e.g.

DOE-STD-1023 and DOE-STD-1020, etc.,) for implementation of NPH mitigation requirements

specified in DOE O 420.1. Site information is necessary for identifying and evaluating potential

external accident initiators and for identifying and analyzing accident consequences external to the

facility (DOE-STD-3009-94). The size of the region to be investigated and the type of data pertinent

to the investigations shall be determined by the nature of the region surrounding the proposed or

existing site, and shall be consistent with the performance category of the facilities. The site

characterization information should be reviewed at the same time the hazard curves are being reviewed

per DOE-STD-1023-95 which is about every 10 years.

For sites containing facilities with SSCs in only Performance Category 1 or 2, at a minimum, sufficient

site information shall be collected so that the NPH assessment (DOE-STD-1023-95) and the design

and evaluation of the facilities (DOE-STD-1020-2002) can be conducted by following the procedures

provided in model building codes or national consensus standards (e.g., FEMA 368 and IBC 2000).

For sites containing facilities with SSCs in Performance Category 3 or 4, more extensive site

characterization shall be carried out to obtain the site information for the site-specific natural

phenomena hazard assessment, and design and evaluation of DOE facilities in accordance with

DOE-STD-1023-95 and DOE-STD-1020-2002, respectively.

The site characterization shall be carried out by a review of the pertinent literature and field

investigations and shall follow the detailed requirements given in Section 5 for various NPHs. Site

experts (in various NPH) with the knowledge and experience of fulfilling the requirements stated in