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
CFR Part: 
CFR Title: 

Content:
ory Guide 1.97, installation of the original equipment in conformance with the licensing basis for seismic qualification is acceptable, provided the other BTP 7-10-4 Revision 5 - March 2007 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 seismic qualification guidelines identified in Regulatory Guide 1.97. Redundancy For Category 1 variables under Revisions 2 and 3 of Regulatory Guide 1.97, no single failure should prevent the operators from being presented information necessary to determine the safety status of the plant and to maintain the plant in a safe condition following an accident. Channels provided to monitor a Revision 2 or 3 Category 1 variable do not need to meet this criterion during channel maintenance, test, or calibration, provided the duration of such testing satisfies the applicable requirements of the licensing basis. For example, the time interval required for a test, calibration, or maintenance operation could be shown to be so short that it would have an insignificant effect on overall availability of the accident monitoring instrumentation system. This BTP does not supplement Regulatory Guide 1.97, Revision 4 and IEEE Std. 497-2002 guidance on this topic. Independence of Redundant Instrumentation For plants using Revisions 2, 3, or 4 of Regulatory Guide 1.97, if a reactor licensing basis does not include a commitment to Regulatory Guide 1.75, “Criteria for Independence of Electric Systems,” and credit is taken for original equipment in meeting the guidelines identified in Regulatory Guide 1.97, installation 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