Document: NUREG-0800
Document ID: 7a278d84-5310-4198-b914-fa3af5a0a0ef
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500553.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
279 with regard to indicating the inoperable status of a portion of the protection system, systems actuated or controlled by the safety system, or essential auxiliary support systems. Reg. Guide 1.53 "Application of the Single-Failure Criterion to Nuclear Power Plant Protection Systems," clarifies the application of the single-failure criterion and endorses ANSI/IEEE Std 379, "Standard Application of the Single-Failure Criterion to Nuclear Power Generating Station Safety Systems." ANSI/IEEE Std 379 discusses the credit taken for testing in the application of the single-failure criterion. Reg. Guide 1.118, "Periodic Testing of Electric Power and Protection Systems," states that the requirements and recommendations of IEEE Std 338, "IEEE Standard Criteria for the Periodic Surveillance Testing of Nuclear Power Generating Station Safety Systems," are considered acceptable methods for the periodic testing of protection systems (subject to the specific exceptions discussed in Reg. Guide 1.118). IEEE Std 338 provides design and operational criteria for the performance of periodic and automatic testing; its requirements and criteria are supplementary to ANSI/IEEE Std 279 and IEEE Std 603. Reg. Guide 1.152, . "Criteria for Digital Computers in Safety Systems of Nuclear Power Plants," which endorses IEEE Std 7-4.3.2, "IEEE Standard for Digital Computers in Safety Systems of Nuclear Power Generating Stations," and IEC Std 880, "Software for Computers in the Safety Systems of Nuclear Power Stations," recommend characteristics for self-testing in digital computer-based protection systems. Reg. Guide 1.153 "Criteria for Power, Instrumentation, and Control Portions of Safety Systems," endorses IEEE Std 603, "IEEE Standard Criteria for Safety Systems for Nuclear Power Generating Stations," as an alternative to ANSI/IEEE Std 279. 3. Definitions Periodic tests are tests performed at scheduled intervals to detect failures and verify operability (IEEE Std 338). Periodic tests include