3. DESCRIPTION OF PROGRAM OR FUNCTION
Oak Ridge National Laboratory has developed a rapid PC-based tool for estimating pertinent information needed to guide response team actions and help characterize some types of nuclear criticality accidents. The concept uses a series of sliding graphs that function similarly to a slide rule. This tool was developed with the promise that visual demonstration of trends (e.g., dose versus time or distance) are helpful to response personnel. The SlideRule provides rapid assessments for direct radiation approximations and is useful for solving for parameters that are dependent upon independent specific parameters such as variable shielding, distances, and anticipated time related radiation doses to personnel. The SlideRule is designed to provide estimates of the following:
- magnitude of the fission yield based on personnel or field radiation measurements,
- neutron- and gamma-dose at variable unshielded distances from the accident,
- the skyshine component of the dose,
- time-integrated radiation dose estimates at variable times/distances from the accident,
- 1-minute gamma radiation dose integrals at variable times/distances from the accident,
- dose-reduction factors for variable thicknesses of steel, concrete, and water.
The SlideRule estimates unknown data based on data available to emergency response personnel, including:
- exposure information about "accident victims,"
- estimates of potential exposures to emergency response re-entry personnel,
- estimation of future radiation field magnitudes, and
- fission yield estimates.
The SlideRule provides estimates for five unreflected spherical systems that provide general characteristics of operations likely in facilities licensed by the NRC:
- low-enriched (5 wt % 235U) uranyl fluoride;
- damp, low-enriched (5 wt % 235U) UO2;
- high-enriched (93 wt % 235U) uranyl nitrate solution;
- high-enriched (93 wt % 235U) uranium metal; and
- damp, high-enriched (93 wt % 235U).