Document: NUREG-0800
Document ID: 56298a3a-bad0-4f4d-91c4-5fc5c1817434
Document Type: srp
Title: INTERLOCK SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0704/ML070460348.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.6
CFR Part: 
CFR Title: 

Content:
hould be emphasized in the review of the interlock systems are identified below. A. Single-failure criterion - See SRP Appendix 7.1-B subsection 4.2 or SRP Appendix 7.1-C subsection 5.1. B. Quality of components and modules - See SRP Appendix 7.1-B subsection 4.3 or SRP Appendix 7.1-C subsection 5.3. C. Independence - See SRP Appendix 7.1-B subsections 4.6 and 4.7 or SRP Appendix 7.1-C subsections 5.6 and 6.3. D. System testing and inoperable surveillance - See SRP Appendix 7.1-B subsections 4.9, 4.10, and 4.13 or SRP Appendix 7.1-C subsections 5.7, 5.8, and 6.5. E. Use of digital systems - See SRP Appendix 7.0-A and SRP Appendix 7.1-D. F. Interlocks to prevent over-pressurization of low-pressure systems - See SRP BTP 7-1. 7.6-6 Revision 5 - March 2007 G. Interlocks to prevent over-pressurization of the primary coolant system during low-temperature operations of the reactor vessel - See SRP BTP RSB 5-2. H. Interlocks for ECCS accumulator valves - See SRP BTP 7-2. I. Interlocks required to isolate safety systems from non-safety systems. J. Interlocks required to preclude inadvertent inter-ties between redundant or diverse safety systems. 2. For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the final safety analysis report (FSAR) meets the acceptance criteria. DCs have referred to the FSAR as the design control document (DCD). The reviewer should also consider the appropriateness of identified COL action items. The reviewer may identify additional COL action items; however, to ensure these COL action items are addressed during a COL application, they should be added to the DC FSAR. For review of a COL application, the scope of the review is dependent on whether the COL applicant references a DC, an early site permit (ESP) or other NRC approvals (e.g., manufacturing license, site suitability report or topical