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:
t the control structure in the discharge canal. If the limiting condition of 90OF is exceeded for a period greater than 2 hours, the event shall be reported promptly according to Section 5.6.2.a(1) of these Technical Specifications and the following sequential actions shall be taken to maintain the cooling water discharge temperature at the control structure at or below 900 F: (1) Full capacity of the station's dilution pumps shall be utilized. (2) The station's operating power level shall be reduced unless an emergency need exists for .the lost power. An emergency need exists when reduction in power would mean cutting off firm customers. (3) Additional corrective action shall be undertaken to meet the specificatiop as rapidly as possible. .Monitoring Requirement A mid-depth continuous temperature recorder shall be used at the control structure. Temperatures at the control structure shall be transmitted to the control room, averaged over one minute, and stored by com puter. The- temperature averaged over one minute shall be visually displayed every minute for monitoring purposes. The accuracy of the system and sensitivity of the temperature sensors shall be 1-3% and 0.1'F, respectively. *This example is provided for illustrative purposes only and it is not intended for use as a model of an environmental technical specification for a limiting condition for operation that is generally applicable to all nuclear power stations. A continuous temperature monitoring station located less than 1000 feet from the point of discharge shall be used as a backup system if the primary system fails. By correlation methods, data from this station will be used to approximate the discharge temperature until the primary system is restored. This station shall be manual ly checked once per 8 hours to verify compliance with technical specifications. The estimated accuracy of using the backup station temperatures and the correlation between backup and discharge-point temperature is 5 to