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:
s proýrided for such limiting conditions for operation should be sufficient to demonstrate that no unacceptable environmental impact will occur with operation at these limits. Eich iirdting condition for operation should be prepared in the following format: Objective The purposes of ihe limiting condition and the specific conditions it is intended to prevent or protect should be indicated. Systems or parts of the facility or locaton to which the jimit applies should be clearly defined. Specification The limiting condition for operation imposed and the proposed corrective actions to be taken when this limit is exceeded should be specified. Monitoring Requirement The monitoring program should be clearly defined. A concise description of the monitoring program should include information on the measurement and sampling methods. location of measurement, sampling frequency, accuracy and sensitivity of measurement, the record keeping procedure, and provisions for monitoring critical parameters in the event the primary monitoring method becomes inoperative. Bases The technical, environmental, and operational considerations in developing the specification and the monitoring requirement should be presented. An example of a limiting condition for operation is appended as Example 1. 2.1 Thermal Limiting conditions for operation should be placed on power plant heat dissipation systems to ensure that impacts on aquatic ecosystems from thermal stress ate controlled within acceptable environmental limits. Thermal stress is controlled by limiting plant operation so that the thermal tolerances of important species are not exceeded with respect to both extreme temperatures and rates of temperature change that preclude physliolo. gical acclimation. Temperature tolerances are dependent on ambient temperature and seasonal physiological requirements of species; thus limiting conditions for operation may vary with season. The need for limiting conditions should be considered for all modes