Document: NUREG-0800
Document ID: a2598df1-7ec6-43a6-9d2a-d8210d1f944f
Document Type: srp
Title: through 7.9. Additional information relevant to the review process can be found in the references in
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500461.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
ilistic risk assessments (PRAs), such as those conducted under the Individual Plant Evaluation program (see Generic Letter 88-20, "Individual Plant Examination for Severe Accident Vulnerabilities") or required as part of applications under 10 CFR 52, provide information that may prove helpful in determining the appropriate level of review. The following seven topics should be addressed in any digital I&C system review: 1. The adequacy of design criteria and guidance to be applied to the proposed system. 2. Identification of review topics — The subsequent review process depends upon the I&C systems addressed in the application. 3. Defense-in-depth and diversity — For applications that involve a reactor trip system (RTS) or an engineered safety features actuation system (ESFAS), the ability of the combination of I&C systems to cope with common-mode failure should be reviewed. This review should confirm that D-in-D&D design conforms to the guidance of Section 7.1 and BTP HICB-19. 4. The adequacy of system functions and commitments for the individual I&C systems — The requirements for each system are outlined in Sections 7.1 through 7.9. For digital systems, this review should address the functional requirements of IEEE 603 and the General Design Criteria that pose new assurance challenges when implemented using computers. The supplemental guidance for digital computer-based safety systems in Section 7.1 describes the system aspects that need careful consideration in digital systems. 5. Life cycle process planning — The adequacy of the computer system development process, particularly the software life cycle activities for digital systems, should be reviewed. This is addressed by confirming that software life cycle plans have commitments to coordinated execution of activity groups, and to staged checkpoints at which product and process characteristics are verified during the development process, as described in Section 7.1 and BTP HICB-14, Section B.3.1. 6. The