Document: NUREG-0800
Document ID: 61fa0820-ed3a-4538-bf4c-8622b3822173
Document Type: srp
Title: B-5
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A091.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
rmal, abnormal, and accident conditions) of the magnitudes, and rates of change of sensed variables to be accommodated until proper conclusion of the protective action is assured. The applicant’s or licensee’s analysis, including the applicable portion provided in Chapter 15, should confirm that the system performance requirements are adequate to ensure completion of protective actions. 4. REQUIREMENTS 4.1. General Functional Requirements (IEEE Std 279-1971, Clause 4.1) Clause 4.1 of IEEE Std 279-1971 requires in part that the protection system shall, with precision and reliability, automatically initiate protective action for the range of conditions and performance enumerated in Clauses 3(7) through 3(9) of IEEE Std 279-1971. The applicant’s or licensee’s analysis should confirm that the protection system has been qualified to demonstrate that the performance requirements are met. The evaluation should confirm that the general functional requirements have been appropriately allocated to the various system components. Automatic initiation is required for all protective functions; a manual initiation capability is also a requirement (see Clause 4.17 of IEEE Std 279-1971 and RG 1.62, “Manual Initiation of Protection Actions”). The evaluation of the precision of the protection system is addressed to the extent that setpoints, margins, errors, and response times are factored into the analysis. The topic of reliability is addressed in the following paragraphs.