Document: NUREG-1555
Document ID: b5d0daf9-9138-4935-a8fb-b1fed4498171
Document Type: esrp
Title: DISCHARGE SYSTEM
Source: NUREG-1555
Source URL: https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1555/initial/
Revision Date: 2007-10
Chapter: 5
Section ID: 5.3.2
CFR Part: 
CFR Title: 

Content:
ent of a thermal block, recirculation of heated effluent to the cooling water intake and thermal buildup, discharge plumes attaching to shorelines, violation of thermal standards, or important impacts to biota, then perform a hydrothermal analysis sufficient to produce a sound basis for evaluating the potential environmental impacts. (5) Base analysis of the hydrothermal data on the applicant’s mathematical and/or physical models and on field or tracer studies performed by the applicant. ` Consult Regulatory Guides 4.4, Reporting Procedure for Mathematical Models Selected to Predict Heated Effluent Dispersion in Natural Water Bodies (NRC 1974) and 1.125, Rev. 1, Physical Models for Design and Operation of Hydraulic Structures and Systems for Nuclear Power Plants (NRC 1978), to analyze the applicant’s mathematical or physical models. ` If the reviewer’s evaluation of these data verifies the validity of the applicant’s approach and results, this should constitute an adequate independent analysis. ` If the reviewer is unable to verify the applicant’s results by this method, perform an independent assessment, using the methods described below. (6) Select an appropriate modeling procedure based on the following considerations: (1) the type of outfall and discharge characteristics, (2) physical characteristics of the receiving water bodies, (3) hydrological flow regimes, (4) hydrodynamic characteristics of the receiving water, (5) water-use patterns in the vicinity of the station, (6) quantity and temperature of the effluents, (7) meteorology, and (8) thermal assimilative capacity of the receiving waters. ` See EPA (1993) and Fisher et al. (1979) for discussions on the applicability of a variety of mathematical thermal discharge models. ` Also consider new models or improved existing models when selecting a mathematical model. (7) Assess physical changes resulting from the discharge system operation, including shoreline erosion, bottom scouring, increased