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:
owing Commission regulations: 1. 10 CFR 50.55a(a)(1), “Quality Standards.” 7.6-3 Revision 5 - March 2007 2. 10 CFR 50.55a(h), “Protection and Safety Systems,” requires compliance with IEEE Std 603-1991, “IEEE Standard Criteria for Safety Systems for Nuclear Power Generating Stations,” and the correction sheet dated January 30, 1995. For nuclear power plants with construction permits issued before January 1, 1971, the applicant/licensee may elect to comply instead with their plant-specific licensing basis. For nuclear power plants with construction permits issued after January 1, 1971, and before May 13, 1999, the applicant/licensee may elect to comply instead with the requirements stated in IEEE Std 279-1971, “Criteria for Protection Systems for Nuclear Power Generating Stations.” For interlock systems that are not safety systems as defined by IEEE Std 603-1991 and isolated from the safety systems, the applicable requirements of 10 CFR 50.55a(h) are IEEE Std 279-1971 Clause 4.7, “Control and Protection System Interaction,” IEEE Std 603-1991 Clause 5.6.3, “Independence Between Safety Systems and Other Systems,” and IEEE Std 603-1991, Clause 6.3, “Interaction Between the Sense and Command Features and Other Systems.” 3. 10 CFR Part 50, Appendix A, General Design Criterion (GDC) 1, “Quality Standards and Records.” 4. GDC 2, “Design Bases for Protection Against Natural Phenomena.” 5. GDC 4, “Environmental and Dynamic Effects Design Bases.” 6. GDC 13, “Instrumentation and Control.” 7. GDC 19, “Control Room.” 8. GDC 24, “Separation of Protection and Control Systems.” 9. 10 CFR 50.34(f)(2)(v), “Additional TMI-Related Requirements, Bypass and Inoperable Status Indication,” or equivalent TMI action requirements imposed by Generic Letters. 10. 10 CFR 52.47(b)(1), which requires that a DC application contain the proposed inspections, tests, analyses, and acceptance criteria (ITAAC) that are necessary and sufficient to