Document: NUREG-0800
Document ID: 2ceb30a4-38c9-442c-bd66-5a699d0e6480
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500554.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
should not accept an argument that the PLC is somehow simpler or different from a computer and hence does not require the rigorous review that a computer system would receive. Appendix 7-A Rev. 4 — June 1997 BTP HICB-18-3 2. Information to be Reviewed Information to be reviewed is contained in the safety analysis report (SAR), revisions to the SAR, license amendment requests, topical reports, or other applicant/licensee documentation. Inspections, tests, analyses, and acceptance criteria (ITAAC) or detailed design documents describe designs, tests, analyses, or other methods of demonstrating that design commitments have been satisfied. Information that is not contained in the licensee/applicant's submittal should be available for review. 3. Acceptance Criteria Purchased PLC hardware, embedded, programming, and operating system software, and peripheral components should be qualified to a level commensurate with the system they are designed to support. EPRI TR-106439 describes an acceptable process for qualifying commercial systems. NUREG/CR-6421 provides more detail 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 predeveloped software (PDS) in 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 BTP HICB-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 BTP HICB-14 commensurate with the system it is designed to support. Application software should conform with the recommended practices of NUREG/CR-6463. Tools for developing