Document: NUREG-0800
Document ID: 924aeba2-7603-48d5-9467-ab37f7d036f0
Document Type: srp
Title: Revision 6 - August 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A169.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
esented 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 the overall availability of the accident monitoring instrumentation system. Independence of Redundant Instrumentation For plants using Revisions 2, 3, or 4 of RG 1.97, if a reactor licensing basis does not include a commitment to RG 1.75, “Criteria for Independence of Electric Systems,” and credit is taken for original equipment in meeting the guidelines identified in RG 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 RG 1.97 and this BTP are satisfied. However, for all reactors, new instrumentation that is installed to satisfy RG 1.97 or to replace original equipment for which credit was taken in satisfying RG 1.97 should satisfy the separation and isolation guidelines in RG 1.75. Display and Recording Revisions 2 and 3 of RG 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, BTP 7-10-5 Revision 6 - August 2016 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