Document: NUREG-0800
Document ID: 21a25622-c805-4d35-996c-a62a763f51a4
Document Type: srp
Title: describes the general procedures to be followed in reviewing any instrumentation and control
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500503.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
ditions such as disconnection of the system, loss of energy, or a postulated adverse environments are experienced. Therefore, the Staff finds that the ESFAS satisfies the requirements of GDC 23. Based on the review of the interfaces between the ESFAS and plant control systems, the Staff concludes that the system satisfies the requirements of [ANSI/IEEE Std 279 OR IEEE Std 603] with regard to control and protection system interactions. Therefore, the Staff finds the ESFAS satisfies the requirements of GDC 24. The Staff conducted a review of the ESF control systems for conformance to the requirements for testability, operability with onsite and offsite electrical power, and single failures. The Staff concludes that the ESF control systems are testable and are operable using either onsite or offsite power (assuming only one source is available). Additionally, the controls associated with redundant ESF systems are independent and satisfy the single-failure criterion and, therefore, meet the relevant requirements of GDC 34, 35, 38, and 41. The conclusions noted above are based upon the requirements of [ANSI/IEEE Std 279 OR IEEE Std 603] with respect to the design of the ESFAS. Therefore, the Staff finds that the ESFAS satisfies the requirements of 10 CFR 50.55a(h). The applicant/licensee has also incorporated in the system design the [recommendations of the TMI task action plan items OR the requirements of 10 CFR 50.34(f)], [identify item number and how implemented] which the Staff has reviewed and found acceptable. In the review of the ESFAS, the Staff examined the dependence of this system on the availability of essential auxiliary systems. Based on this review and coordination with those having primary review responsibility of EAS systems, the Staff concludes that the design of the ESFAS is compatible with the functional requirements of EAS systems. Note: the following finding applies only to systems involving digital computer-based components. Based on the review of