Document: NUREG-0800
Document ID: 5c379bc2-cb0b-42ca-93af-dedf43c6cb30
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500542.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
of satisfying Reg. Guide 1.97, or new instrumentation that is installed to replace original equipment for which credit was taken in satisfying Reg. Guide 1.97, should satisfy the seismic qualification guidelines identified in Reg. Guide 1.97. Appendix 7-A Rev. 4 — June 1997 BTP HICB-10-3 Independence of Redundant Category 1 Instrumentation If a reactor licensing basis does not include a commitment to Reg. Guide 1.75, "Physical Independence of Electric Systems," and credit is taken for original equipment in meeting the guidelines identified in Reg. Guide 1.97, then installation of the original equipment in conformance with the licensing basis requirements for separation and independence is acceptable, provided the other guidelines identified in Reg. Guide 1.97 and this BTP are satisfied. However, for all reactors, new instrumentation that is installed for the purpose of satisfying Reg. Guide 1.97, or new instrumentation that is installed to replace original equipment for which credit was taken in satisfying Reg. Guide 1.97, should satisfy the separation and isolation guidelines identified in Reg. Guide 1.97. Display and Recording Reg. Guide 1.97 states in part that if direct or immediate trend or transient information is essential for operator information or action, the recording should be continuously available on dedicated recorders. Otherwise, the information may be continuously updated, stored in computer memory, and displayed on demand. For the latter non-essential applications, the use of Category 2 computers or dedicated Category 2 recorders is acceptable for recording Category 1 information, provided the Category 1 instrumentation is isolated from the Category 2 instrumentation using qualified isolation devices. Range Deviations from the range values identified by Reg. Guide 1.97 may be acceptable if supported by analyses demonstrating that the indication would remain on scale with appropriate margins for any design basis event or accident for which the