Document: NUREG-0800
Document ID: 896f0b4b-b27c-462b-aed0-872a58b455c8
Document Type: srp
Title: Revision 6 – August 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A327.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
esign documents describe designs, tests, analyses, or other methods of demonstrating that design commitments have been satisfied. Information that is not contained in the licensee’s or applicant’s submittal should be available for review. 3. Acceptance Criteria Purchased PLC hardware; embedded and operating systems software, programming tools, and peripheral components should be qualified to a level commensurate with the system they are designed to support. EPRI TR-106439 and EPRI TR-107330 describe an acceptable process for qualifying commercial systems. NUREG/CR-6421 provides additional information on the characteristics of an acceptable process for qualifying existing software, and discusses the use of engineering judgment and compensating factors for purchased PLC software. See the discussion of the commercial dedication of pre-developed software (PDS) in SRP Appendix 7.0-A. PLC hardware, embedded and operating system software, and peripheral components built specifically for nuclear power plant applications should meet the appropriate quality criteria. The embedded and operating system software should meet the acceptance criteria contained in SRP BTP 7-14, appropriately graded for the application in which the PLC will be used. The application software (ladder logic or other) should meet the acceptance criteria contained in SRP BTP 7-14 commensurate with the system it is designed to support. Application software should conform to the recommended practices of NUREG/CR-6463. Tools for developing application software or loading it into the PLC should be qualified to a level commensurate with the system they are designed to support. PLC-based functions should conform to the guidance regarding real-time performance and testing outlined in SRP BTP 7-21, “Guidance on Digital Computer Real-Time Performance,” and SRP BTP 7-17, “Guidance on Self-Test and Surveillance Test Provisions.” Administrative or hardware lockout controls that prevent unauthorized