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:
by the licensee. 4.8-20 EXAMPLE 2 EXAMPLE OF AN ENVIRONMENTAL SURVEILLANCE PROGRAM ELEMENT* 3.12.a.(2) Impingement of Organisms * Objective The objective of the monitoring program is to determine the rnumber, size, weight, and species of aquatic organisms impinged and killed on the vertical traveling screens and in trash baskets. Specification The number, size, weight, and species of organisms impinged and removed from the intake water body and collected in the circulating water trash baskets shall be determined. A sample shall consist of all organisms removed from the intake water body and collected in the trash baskets as the result of one hour of continuous operation of the traveling screens in all intake bays through which water is being pumped. Organisms im pinged and entrapped prior to the one-hour cycle shall not be considered part of the sample. Four samples shall be taken each 24-hour period with 5 hours elapsed between successive samplings. The time of initiation of each sample period shall be the same each day. For each sample, all species shall be identified and all individuals in each species shall be counted. Size and weight measurements shall be taken in a manner consistent with fishery practice for all species by one of the following criteria: (1) Individual organisms of one species numbering less than 100 per sample: all individuals shall be sized and weighed. (2) Individual organisms of one species numbering. more than 100 per sample: a subsample of 100 individuals or 25% of the total individuals of that species, whichever is more, shall be sized and weighed. The subsample shall be taken in a manner to avoid bias in size, weight, or physical condition of the organisms in the subsample. For each organism sized and weighed, a determina tion shall be made 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