Document: NUREG-0800
Document ID: f4b8f0c1-9a14-46be-88c9-a6cb74d64dff
Document Type: srp
Title: Rev. 4 — June 1997
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500499.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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Content:
he safety analysis report (SAR). Except for the requirements for independence between control systems and protection systems, IEEE Std 603 does not directly apply to the non-safety systems such as the control systems and diverse I&C systems described in SAR Sections 7.7 and 7.8, respectively. Although intended only for safety systems, the criteria for IEEE Std 603 are applicable to any I&C system. Therefore, for non-safety I&C systems that have a high degree of importance to safety, the reviewer may use the concepts of IEEE Std 603 as a starting point for the review of these systems. Applicable considerations include design bases, redundancy, independence, single failures, qualification, bypasses, status indication, and testing. Digital data communication systems as described in Section 7.9 are support systems for other I&C systems. As such, they inherit the applicable requirements and guidance that apply to the supported systems. Consequently, the guidance of IEEE Std 603 is directly applicable to those parts of data communication systems that support safety system functions. An HICB review of safety systems that follows the guidance of IEEE Std 603 should be coordinated with other branches as appropriate to address the following considerations: • Many of the auxiliary supporting features and other auxiliary features defined in IEEE Std 603 are described in Chapters 4, 5, 6, 8, 9, 10, and 12 of the SAR. HICB reviewers should coordinate with the reviewers of these sections to ensure auxiliary features are appropriately addressed by the review. • The site characteristics, systems (both physical and administrative), and analyses described in the other sections of the SAR may impose requirements on the I&C systems. HICB reviewers should coordinate with the reviewers of these sections to ensure that the I&C systems appropriately address these requirements. • I&C systems may impose requirements upon other plant systems and analyses. HICB reviewers should coordinate