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:
ch 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 inorganic complexants in stored liquids that are also released during an accident. Complexants can greatly alter the sorption characteristics normally associated with radionuclides, in some cases making them freely mobile in the ground water system. In surface water conceptual models, consideration should be given to the potential for stratified flow to restrict a contaminant release to a fraction of the stream flow or lake volume, and more severely impact the ecology and people at select locations defined by the stratification. 2. Pathways: The staff should make independent calculations of the transport capabilities and potential contamination pathways of the groundwater environment under accidental conditions with respect to existing users and known and likely future users. Special attention should be directed to proposed facilities with permanent dewatering systems to ensure that pathways created by those systems have been identified. The staff should, in consultation with the organization responsible for review of solid waste and liquid and gaseous effluents, choose the accident scenarios leading to the most adverse contamination of the groundwater or the surface water. Analysis of the contamination should commence with the simplest models, using demonstrably conservative assumptions and coefficients. Dilutions and travel times (or, alternatively, concentrations directly) resulting from the preliminary analyses should be provided to the organization responsible for review of solid waste and liquid and gaseous effluents and to the organization responsible for review of radiation protection to carry out further dose calculations. Further analyses using progressively more realistic and less conservative modeling techniques, should be undertaken if the preliminary