Document: NUREG-0800
Document ID: e3caee65-c7fb-44ba-b41b-b7a6e49073ca
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550077.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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CFR Title: 

Content:
ions to be performed. GDC 24, "Separation of Protection and Control Systems," requires in part that the protection system be separated from the control systems to the extent that failure of any single control system component or channel, or failure or removal from service of any single protection system component or channel that is common to the protection system, leaves intact a system satisfying all reliability, redundancy, and independence requirements of the protection system. GDC 29, "Protection against Anticipated Operational Occurrences," requires in part that protection and reactivity control systems be designed to ensure an extremely high probability of accomplishing their safety function in the event of an anticipated operational occurrence. 2. Relevant Guidance IEEE Std. 603-1991 requires in part that the safety system design basis include the following: • The increment allotted for inaccuracies, calibration uncertainties, and errors. • The overall response times of the safety system used in establishing the setpoint allowable value. BTP 7-13-3 Revision 5 - March 2007 • The basis to demonstrate that the assumed values used for instrumentation inaccuracy, calibration uncertainties and error, and time response are acceptable and reasonable. Performance of an RTD is characterized by its accuracy and response time. Accuracy is a measure of how well the RTD indicates a static temperature, and response time indicates how quickly the RTD can sense a temperature change. NUREG/CR-5560, "Aging of Nuclear Plant Resistance Temperature Detectors," asserts that the calibration and response time of RTDs are affected by aging even within design conditions, but that the aging is manageable by periodic tests performed at each refueling interval. EPRI TR-106453-3925, "Temperature Sensor Evaluation," provides additional information on RTD performance. 3. Purpose The purpose of this BTP is to provide guidance for NRC reviewers to verify that the previously cited