Document: NUREG-0800
Document ID: b9d43224-eb4e-4b19-a212-b3bb8c0ffbb5
Document Type: srp
Title: Diversity and
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660258.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.9
CFR Part: 
CFR Title: 

Content:
process is accomplished by comparing the commercial-grade item to the design criteria of the standard. This standard allows the use of engineering judgment for the acceptance of existing software, and the use of compensating factors to substitute for missing elements of the software development process. These provisions should not be interpreted to permit unsupported subjectivity in the acceptance of existing software. The guidance provided herein for the review of newly developed software provides technical background pertinent to evaluating the use of the engineering judgment and compensating factors provisions. The standard requires the acceptance, and its basis, to be documented and maintained with the qualification documentation. To demonstrate reasonable assurance, the acceptance process for most PDS can be expected to comprise a variety of technical activities conducted in significant detail. Guidance on these activities has been provided in EPRI TR-106439. The NRC has issued a safety evaluation report (SER) on the EPRI guideline in which it is determined that "TR-106439 contains an acceptable method for dedicating commercial grade digital equipment for use in nuclear power plant safety applications." If the guidance in EPRI TR-106439 is applied in the dedication of a component, the following items should be noted by the reviewer: • EPRI TR-106439 is not intended to be used as a detailed "how-to" manual. There may be significant variation in specific steps taken depending on vendors, components, and applications. Detailed specific information, in addition to that provided in the report examples, will be needed to perform an actual commercial dedication. Use of EPRI TR-106439 in connection with a license amendment or 10 CFR 50.59 evaluation should include descriptions of the alternatives selected and deviations from the guidance in the documentation of the acceptance process. • The dedication effort may be "graded" based on safety significance and relative