Document: NUREG-0800
Document ID: d563bf0f-7b24-4ff5-99a2-4f822eb86bd9
Document Type: srp
Title: INTERLOCK SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052360612.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.6
CFR Part: 
CFR Title: 

Content:
gh Pressure Reactor Coolant System." Based on our review, we conclude that the design of this system satifies the staff's guidelines. Our review included the interlock provided to prevent overpressur- ization of the primary coolant system during low temperature opera- tion. The staff's position with regards to this interlock system is set forth in Branch Technical Position RSB 5-2, "Overpressur- ization Protection of Pressurized Water Reactors While Operating at Low Temperatures." Based on our review we conclude that the design of this system satisfies the staff's guidelines. Our review included the interlock for the ECCS accumulator valves. The staff's position with regards to this interlock system is set forth in Branch Technical Position ICSB 4, "Requirements of Motor Operated Valves in the ECCS Accumulator Lines." Based on our review we conclude that these interlocks satisfy the staff's guidelines. 7.6-4 Rev. 2 - July 1981 Based on our review of the interlock systems important to safety, we conclude that their design bases is consistent with the plant safety analysis and the systems importance to safety. Further, we conclude that the aspects of the design of those systems with respect to single failures, redundancy, independence qualification and testability are adequate to assure that the functional perform- ance requirements of these .systems will be met and meet the applicable requirements of GDC 2 and 4. The applicant has also incorporated into the system design the recommendations of Task Action Plan item [iden- tify item number and how implemented] which we have reviewed and found acceptable. The conclusions noted above for the interlock systems important to safety are applicable to all portions of the systems except for the following for which acceptance is based upon prior Commission review and approval as noted: [List applicable system or topics and identify references] V. IMPLEMENTATION The following is intended to provide guidance to applicants and