Document: NUREG-0800
Document ID: 861c72fa-b163-4443-a01e-48d1504c12a6
Document Type: srp
Title: INTERLOCK SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159B156.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.6
CFR Part: 
CFR Title: 

Content:
19, 24, 28, 33, 34, 35, 38, 41 and 44, 7.6-7 Draft Revision 6 – August 2015 10 CFR 50.54(jj) and 50.55(i), and 10 CFR 50.55a(h). The staff conducted a review of these systems for conformance to the guidelines in the RGs and industry codes and standards applicable to these systems. The staff concludes that the applicant or licensee adequately identified the guidelines applicable to these systems and has properly classified them. Based upon the review of the system design for conformance to the guidelines, the staff finds that there is reasonable assurance that the systems fully conform to the guidelines applicable to these systems. Therefore the staff finds that the requirements of General Design Criteria 1, 15, 16, 33, 34, 35, 38, 41, and 44, and 10 CFR 50.54(jj) and 50.55(i) have been met. Based on the review of interlock system functions, the staff concludes that appropriate interlocks are provided to maintain an appropriate design margin to assure that acceptable fuel design limits are not exceeded during any condition of normal operation, including the effects of anticipated operational occurrences. Therefore, the staff finds that the interlock systems satisfy the requirements of General Design Criteria 10, 15, 16, 28, 33, 34, 35, 38, 41, and 44. Based on the review of interlock system status information, initiation capabilities, and provisions to support safe shutdown, the staff concludes that information is provided to monitor interlocks over the anticipated ranges for normal operation, for anticipated operational occurrences, and for accident conditions as appropriate to assure adequate safety. Appropriate controls are provided for interlock initiation and bypass. The interlocks appropriately support actions to operate the nuclear power unit safety under normal conditions and to maintain it in a safe condition under accident conditions. Therefore, the staff finds that the interlock systems satisfy the requirements of GDC 13 and 19. The staff conducted a