Document: NUREG-0800
Document ID: b09bdecd-fb52-4a15-ab35-7b597cbbaa13
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500546.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
Appendix 7-A Rev. 4 — June 1997 BTP HICB-13-1 NEW Branch Technical Position HICB-13 Guidance on Cross-Calibration of Protection System Resistance Temperature Detectors A. Background The purpose of this branch technical position (BTP) is to identify the information and methods acceptable to the Staff for using cross-calibration techniques for surveying the performance of resistance temperature detectors (RTDs). These guidelines are based on experience in the detailed reviews of applicant/licensee submittals describing the application of in-situ cross-calibration procedures for reactor coolant RTDs, as well as NRC research activities. In addition, the Staff has completed reviews of applicant/licensee submittals and found that they met the requirements of the regulations identified. Other methods, such as using a diverse parameter to provide a cross-correlation reference, can be used if adequate justification is provided. 1. Regulatory Basis 10 CFR 50.55a(h) requires in part that protection systems satisfy the criteria of ANSI/IEEE Std 279, "Criteria for Protection Systems for Nuclear Power Generating Stations," including the following: • Section 3(9) regarding the bases for minimum performance requirements, including response times and accuracies. • Section 4.9, "Capability for Sensor Checks." • Section 4.10, "Capability for Test and Calibration." 10 CFR 50 Appendix A, General Design Criterion (GDC) 13, "Instrumentation and Control" requires in part that instrumentation be provided to monitor variables and systems, and that controls be provided to maintain these variables and systems within prescribed operating ranges. 10 CFR 50 Appendix A, GDC 20, "Protection System Functions," requires in part that the protection system be designed to initiate operation of appropriate systems to ensure that specified acceptable fuel design limits are not exceeded. 10 CFR 50 Appendix A, GDC 21, "Protection System Reliability and Testability," requires in part that the