Document: NRC Regulatory Guide
Document ID: f0baf50b-5bb7-4783-b2f9-9586e09c97e1
Document Type: regulatory_guide
Title: Preparation of Environmental Reports for Nuclear Power Stations + HISTORY - HISTORY 02/2017 – DG-4026 , Proposed Revision 3 09/2014 – Periodic Review of Revision 2 – Revise (Rev. 3)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML1611/ML16116A068.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.2
CFR Part: 
CFR Title: 

Content:
and their associated site interface values, clearly indicating the units of measure for the interface value and whether the value is for a single unit or all proposed units. The applicant should also describe the operational activities for structures and facilities associated with the transmission system, transportation infrastructure, and the stormwater-management system. Information on operational environmental interfaces should include, but is not limited to, the following: • Water Interfaces – A quantitative water-use diagram showing anticipated flow rates to and from the various station water systems (e.g., heat-dissipation system, sanitary system, radwaste and chemical waste systems, and process water systems), including the source of water for each system and the receiving water for any liquid discharge to a waterbody. – A table of anticipated normal operational flow rates and maximum flow rates, indicating assumptions and conditions for each. – The flow diagram and tabulated information that clearly presents the operating plant water balance by accounting for withdrawals, consumptive use (water that is not returned to the source water body, for example, water from a river that is lost to evaporation in the cooling towers), and liquid discharges. – A description of intake operation, including approach and through-screen velocities, debris, and fish-return-system operation at all intake or pumping locations. – Pertinent temperatures and methods used for estimating evaporation and drift rates. – Cooling-tower blowdown volume, flow rates, temperature range, and number of cycles of concentration assumed for normal operation and any other modes of operation considered. – Estimated temperature and chemical constituent concentrations in wastewater at the discharge point. – A description of controlling structures and flow patterns, residence times, rate of temperature changes, evaporation rate, and seepage rate for any cooling-water reservoirs or