Document: NUREG-0800
Document ID: e9416315-bef5-4651-b3dd-6724d6bc345a
Document Type: srp
Title: ACCIDENTAL RELEASES OF LIQUID EFFLUENTS IN GROUND AND SURFACE WATERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340559.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.13
CFR Part: 
CFR Title: 

Content:
ectly) result- ing from the preliminary analyses will then be checked by ETSB to determine acceptability. If the indicated concentrations of radionuclides, identified by ETSB, are less than the values identified in 10 CFR Part 20, Appendix B, Table II, Column 2, no further computational efforts will be warranted. Further analyses using progressively more realistic and less conservative modeling techniques, such as those of Reference 13 and 25, will be undertaken if the preliminary results are not acceptable. Independent calculations will be made of liquid effluent transport for the sur- face pathways identified. For preliminary analysis, the staff.will employ simpli- fied calculational procedures or models, such as those contained in References 3 and 9. The ahalysis will be performed using demonstrably conservative coeffi- cients and assumptions, and the physical conditions (such as lowest recorded river flow) likely to give the most adverse dispersion of the liquid effluent. The applicant's model assumption and results will be compared with the staff's 2.4.13-2 Rev. 2 -. July 1981 results to assure that the results are comparably.conservative. The estimation of liquid effluent dispersion will reflect potential future changes that might result from variations in use by known future surface and groundwater users. Concentrations of radionuclides in the body of water under consideration will be calculated based on the staff's dispersion computations and with initial concentrations provided by the Effluent Treatment Systems Branch (ETSB) for the most critical event; Acceptability of the resultant concentrations of radio- active effluent at the points of interest will be determined by cpnsultation with ETSB. If the concentrations of the diluted liquid effluents computed by the staff are within acceptable limits of Appendix B, Table II, Column 2, of 10 CFR Part 20, no further computation effort is indicated. If the concentra- tions computed by conservative simplified