Document: NUREG-0800
Document ID: 1b840382-003a-4162-a666-f8ba076b669c
Document Type: srp
Title: Revision 6 – August 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A316.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ed system unless physical, electrical, and communications independence are maintained such that no failure of the test function can inhibit the performance of the safety function. The positive aspects of self-test features should not be compromised by the additional complexity that may be added to the safety system by the self-test features. The improved ability to detect failures provided by the self-test features should outweigh the increased probability of failure associated with the self-test feature. Self-test functions should be verified during periodic functional tests. BTP 7-17-7 Revision 6 – August 2016 Surveillance Testing Systems should be able to conduct periodic surveillance testing consistent with the technical specifications and plant procedures. As delineated in RG 1.118, periodic testing consists of functional tests and checks, calibration verification, and time response measurements. As required by IEEE Std 279-1971, Clause 4.13, or IEEE Std 603-1991, Clause 5.8.3, and as stated in RG 1.47, if the protective action of some part of a protection or safety system is bypassed or deliberately rendered inoperative for testing, that fact should be continuously indicated in the control room. Provisions should also be made to allow operations staff to confirm that the system has been properly returned to service. RG 1.118 states in part that test procedures for periodic tests should not require makeshift test setups. For digital computer-based systems, makeshift test setups, including temporary modification of code or data that must be appropriately removed to restore the system to service, should be avoided. If automatic test features are credited with performing surveillance test functions, provisions should be made to confirm the execution of the automatic tests during plant operation. The capability to periodically test and calibrate the automatic test equipment should also be provided. The balance of surveillance and test functions that are not