Document: NUREG-0800
Document ID: fa9a9d5c-42ee-4507-b736-571f01da69cc
Document Type: srp
Title: CONTROL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070670042.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.7
CFR Part: 
CFR Title: 

Content:
f GDC 19 with regard to normal plant operations. The staff review determines that the control systems are appropriately isolated from safety systems and would preserve the reliability, redundancy, and independence requirements of the protection system. Therefore, the staff concludes that the isolation of these systems from safety systems satisfies the applicable requirements of 10 CFR 50.55a(h) and the requirements of GDC 24. Based on the review of the applicant/licensee's diversity and defense-in-depth analysis and the quality of control system functions credited in this analysis, the staff concludes that the control system complies with the criteria for defense against common-cause 7.7-8 Revision 5 - March 2007 failure in digital instrumentation and control systems. Therefore, the staff finds that the control system functions credited as diverse means for performing safety functions satisfy the criteria of Item II.Q of the Staff Requirements Memorandum on SECY-93-087. The staff confirmed that the consequential effects of anticipated operational occurrences and accidents do not result in control system failures that would cause plant conditions more severe than those bounded by the analysis of the events. Based on the review of system functions, the staff concludes that the control systems conform to the requirements of 10 CFR 50.34(f)(2)(xxii). The applicant/licensee has incorporated in the system design the requirements of 10 CFR 50.34(f)(2)(xxii), [identify how implemented] which the staff has reviewed and found acceptable. The conclusions of the analysis of anticipated operational occurrences and accidents as presented in Chapter 15 of the SAR have been used to confirm that plant safety is not dependent upon the response of the control systems. The staff also confirmed that failure of the control systems themselves or as a consequence of supporting system failures, such as loss of power sources, does not result in plant conditions more severe than those