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:
omatically performing surveillance test functions, provisions must be made to confirm the execution of the automatic tests during plant operation. The capability to periodically test and calibrate the automatic test equipment must also be provided. Hardware and software used to perform periodic self-testing should be of equivalent safety classification and quality as the tested system. The design should maintain channel independence, maintain system integrity, and meet the single-failure criterion during testing. Commercial digital computer-based equipment used to perform periodic testing should be appropriately qualified for its function. Actions on Failure Detection The design should have either the automatic or manual capability to take compensatory action upon detection of any failed or inoperable component. The design capability and plant technical specifications, operating procedures, and maintenance procedures should be consistent with each other. Plant procedures should specify manual compensatory actions and mechanisms for recovery from automatic compensatory actions. Mechanisms for operator notification of detected failures should comply with the system status indication provisions of IEEE Std 603 and should be consistent with, and support, plant technical specifications, operating procedures, and maintenance procedures. 4. Review Procedures The surveillance test and self-test features of each digital computer-based module, as well as each system incorporating digital computers, are reviewed to verify conformance with acceptance criteria. The review of surveillance test provisions should confirm that these provisions are adequate to fulfill the fundamental intent of each surveillance test. Because of design and architectural differences between analog and digital systems, traditional provisions for analog systems may not be adequate for digital computer-based systems. C. References ANSI/IEEE Std 279-1971. "Criteria for Protection Systems for Nuclear Power