Document: NUREG-0800
Document ID: d804e0bf-cdaf-4241-8a9e-1eaa21d9ca1a
Document Type: srp
Title: ENGINEERED SAFETY FEATURES SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350475.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.3
CFR Part: 
CFR Title: 

Content:
our review, we conclude that the ESFAS satisfies the requirement of IEEE Std 279 with regards to the systems independence. Therefore, we find that the ESFAS satisfies the requirement of GDC 22. 7.3-7 Rev. 2 - July 1981 Based on our review of the analysis for the ESFAS, we conclude that the system is designed with due consideration of safe failure modes if conditions such as disconnection of the system, loss of energy, or postulated adverse environment are experienced. Therefore, we find that the ESFAS satisfies the requirements of GDC 23. Based on our review of the interfaces between the ESFAS and plant operating control systems, we conclude that the system satisfies the requirements of IEEE Std 279 with regards to control and protection system interactions. -OR- The ESFAS is completely independent of any plant operating control system or channel. -AND- Therefore, we find that the ESFAS satisfies the requirement of GDC 24. Our conclusions noted above are based upon the requirements of IEEE Std 279 with respect to the design of the ESFAS. Therefore, we find that the ESFAS satisfies the requirement of 10 CFR Part 50, §50.55a(h) with regards to IEEE Std 279. Our review of the ESF control systems included conformance to the requirements for testability, operability with onsite and offsite electrical power, and single failures consistent with the General Design Criteria applicable to these ESF systems. We conclude that the ESF control systems are testable and are operable on either onsite or offsite power (assuming only one source is available) and that the controls associated with redundant ESF systems are independent and satisfy the single failure criterion and therefore meet the relevant requirements of GDCs 34, 35, 38, and 41. The applicant has also incorporated into system design the recommendation of Task Action Plan item [identify item number and how implemented] which we have reviewed and found acceptable. Our review of the ESFAS and ESF control systems has