Document: NRC Regulatory Guide
Document ID: 01fb3132-b05a-41a0-ab81-466a6fb6f4d3
Document Type: regulatory_guide
Title: Preparation of Environmental Reports for Nuclear Power Plant License Renewal Applications (Rev. 1)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0916/ML091620409.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.2S1
CFR Part: 
CFR Title: 

Content:
e to these issues. If the plant does not meet the above conditions, the applicant should provide the information and analysis described below. Information and Analysis Content If the plant obtains its water from a river with low flow as defined above and uses cooling towers or cooling ponds, the ER should include the following information: • Provide estimates of the quantities and timing of cooling water withdrawals and discharges. Estimate current consumptive water use and future consumptive water use during the license renewal period. Provide water level, flow, and stream gauge data so that water balance calculations can be verified. • Compare the consumptive water used by the heat-dissipation system to flows in the source water body (i.e., the river from which water is withdrawn for cooling tower or cooling pond makeup water). Base this comparison on records of the initial license period. Project and compare consumptive use and stream flows during the license renewal period. • Estimate the quantities of other ongoing water withdrawals and consumptive water uses in the portion of the water body affected by the plant and indicate whether these withdrawals or uses are expected to change during the license renewal period. DG-4015, Page 27 • Describe mitigation measures (e.g., limiting withdrawals during droughts) that have been used to reduce the adverse impacts on river flow of consumptive water use and the mitigation measures that are expected to be used during the license renewal period. Briefly explain the rationale for rejecting measures that were considered but not implemented. Groundwater Use Conflicts (Plants with Closed-Cycle Cooling Systems That Withdraw Makeup Water from a River) This section applies to plants using cooling towers that withdraw makeup water from a river. Table B-1 states the following: Water use conflicts could result from water withdrawals from rivers during low-flow conditions, which may affect aquifer recharge. The significance