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:
r control area studies as particularly vulnerable to impact. Key indicator organisms should be identified prior to plant startup. Endangered or threatened species should receive special attention. (2) fmpingzmwit ,f . ; LOutermine the numbers of fish and other organisms that impinge on intake screens. The significance of impingement losses should be evaluated within die context of the findings of the generai •.:;•gi:rl •:.'ý • . t m : c,• usd to sample and ,et-of t5:e o ,rg.. i''.- a.d are killed at the in~ajkc a . re to be returned tG the receiving 4atL,. ineiigate thehi subsequent survival Forms. ietckrnie thc spe wia+ ui , pidantity ol important organismrs entrained and die effects of entrainment on immediate sunvival of individuals and long-term survival of the species population in natural waters. The significance of entrainment mortalities should be evaluated within the con text of the findings of the general ecological survey and the effects on impor tant species populations. investigations - ,hould be performed seasonally on a ditl baWs aild, where possible, should indicate the contribution of mechanical, thermal, and chemical stresses to the overall effects observed. b. Terrestrial (1) General Ecological Suevy. Determine the effects of plant operation on important vegetation and wildlife, including resident iod wmi r.ivy birds. Such effects may result from dift orinpating from plant cooling systems, noise, and mainteriance of transirdssion line corridors. (2) Other Program Elements Evaluate unique site or plant design features tu di•ezv p1) :;1.2i. dvrr effects on terrestrial biota. SuJ, effect3 ,ahi mclude immediate and long-term chaoge.' m spc;:!es abandance, diversity, distribution, and comipobizon. 3.2 Radi(oWagcal .nu, li ,torlht Radiological environmental monilortng programs should be established to provide data on measurable levels of radiation and radioactive materials in the site environs. Appendix I to 10 CFR Part 50 requires that the