Document: NUREG-0800
Document ID: 71224475-ca63-4c09-acc1-c682d58112dd
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550082.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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CFR Title: 

Content:
of the original equipment in conformance with the licensing basis requirements for separation and independence is acceptable, provided the other guidelines identified in Regulatory Guide 1.97 and this BTP are satisfied. However, for all reactors, new instrumentation that is installed to satisfy Regulatory Guide 1.97 or to replace original equipment for which credit was taken in satisfying Regulatory Guide 1.97 should satisfy the separation and isolation guidelines in Regulatory Guide 1.97. Display and Recording Revisions 2 and 3 of Regulatory Guide 1.97 state 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. Guidance on the application and qualification of isolation devices is provided in SRP BTP 7-11. This BTP does not supplement Regulatory Guide 1.97, Revision 4 and IEEE Std. 497-2002 guidance on this topic. Range Deviations from the range values identified in Revisions 2 and 3 of Regulatory Guide 1.97 may be acceptable if supported by analyses demonstrating that the indication would remain on scale BTP 7-10-5 Revision 5 - March 2007 with appropriate margins for any design basis event or accident for which the instrumentation might be required for operator information. An appropriate margin should include allowance for analytical uncertainties and instrumentation uncertainties. However, Regulatory Guide 1.97 identifies that, for a limited number of functionally significant variables (e.g., containment pressure, primary system pressure),