Document: NUREG-0800
Document ID: 6524eea0-4e14-443b-9533-59e5ba85e0cb
Document Type: srp
Title: ACCIDENTAL RELEASES OF RADIOACTIVE LIQUID EFFLUENTS IN GROUND AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730449.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.13
CFR Part: 
CFR Title: 

Content:
are consistent with these data. As applicable, reviews of OLs and COLs include a determination on whether the content of technical specifications related to hydrology-related site characteristics are acceptable and whether the technical specifications reflect consideration of any identified unique conditions. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. Alternate Conceptual Models: Whether simple or highly complex multi-dimensional models are employed, conservative or bounding simulations are achieved by representing the existing ground and surface water systems with conservative conceptual models populated with conservative model parameters. Use of conservative model data in an inappropriate or non-conservative conceptual model will not provide a conservative analysis. For example, an aquifer in a karst geology with solution channels may not be conservatively represented by a porous medium continuum conceptual model. A variety of alternative conceptual models, each based on the geological and hydrological characteristics of the site, needs to be envisioned as part of the complete conceptual model for a site, and the combination of ground and surface water conceptual models yielding the most adverse contaminant concentrations should be used in conservative or bounding analyses. Consideration should be given to preferential flow in groundwater resulting from the geology (e.g., karst geology), or from spatial variability in sediment structure (e.g., impermeable strata forcing groundwater to perch or move laterally and form seeps or springs). Regarding the mobility of 2.4.13-6 Revision 3 - March 2007 contaminants, consideration should be given to the potential for the inclusion of organic or