Document: NUREG-0800
Document ID: 409035a3-eae4-4524-8ae0-ca7775f4072a
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550073.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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CFR Title: 

Content:
digital computers to I&C systems, such as maintenance, verification and validation, electromagnetic interference, and calibration, apply and should be reviewed. The staff 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. BTP 7-18-4 Revision 5 - March 2007 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 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 predeveloped 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