Document: NRC Regulatory Guide
Document ID: eb3f5778-b26b-4ba0-9962-f7101bddfff7
Document Type: regulatory_guide
Title: (Rev. 3005)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0037/ML003739900.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.8
CFR Part: 
CFR Title: 

Content:
de as to whether the organism is alive or dead, based on the following criteria: (1) An organism is dead if operation of the breathing apparatus has ceased. (2) An organism shall be considered dead if it has obvious injuries, has lost its equilibrium, is behaving in a *This example is provided for illustrative purposes only and is not intended for use as a model of an environmental technical specification for an environmental surveillance program that is generally applicable to all nuclear power stations. stunned or other abnormal manner, or is unlikely to survive. Reporting Requirement A prompt report to the NRC according to Section 5.6.2.a(l) of these Technical Specifications is reqt.ired if any of the following conditions exist: (1) The number of individuals of all species of fmfis"" combined exceeds 50 per sample in each of four consecutive samples. (2) The number of salmonids exceeds 10 per sample in each of four consecutive samples. (3) The number of crabs exceeds 20 per sample in each of four consecutive samples. Bases" The magnitude, of loss and the potential impact to the ecosystem in the environs of the power plant resulting from impingement and death of aquatic organ isms on the traveling screens is not precisely known or determinable on theoretical bases alone. Sampling of organisms collected in the trash baskets will ensure that the majority of organisms killed in the intake structure will be Identified and enumerated. This information when combined with results from the environmental surveillance program in the intake/receiving water will provide the empirical basis on which to judge the impact of the plant operation.. The report levels for total fmfish, salmonids, and crabs are based on the results of population dynamics studies performed in the river supplying cooling water to the plant. Based on these and other population modeling studies to date, loss by impingement at or below the report levels should not result in an unacceptable impact to these