Document: NUREG-0800
Document ID: 4926757d-c89a-498c-a8cb-918908ab5496
Document Type: srp
Title: of the SAR should provide this information.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350467.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.3
CFR Part: 
CFR Title: 

Content:
ntil conclusion of the protective action be identified. The applicant's analysis, including the applicable portion provided in Chapter 15, should confirm that the system performance require- ments are adequate to assure completion of protective actions. Regulatory Guide (RG) 1.105, "Instrument Spans and Set Points," provides guidance for evaluating Sections 3(5) and 3(9). 2. Section 4.1, General Functional Requirements - This section requires that the protection system shall, with precision and reliability, automatically initiate protective action for the range of conditions and performance enumerated in Sections 3(7) through 3(9). The applicant's analysis should confirm that the protection system has been qualified to demonstrate that the performance requirements are met. 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 evaluation of reliability.of the protection system is addressed.to the extent that conservatively rated high quality components are used. Auto- matic initiation is required for all protective functions. Manual initia- tion is also a requirement (see Section 4.17 and RG 1.62). 3. Section 4.2, Single Failure Criterion - This section requires that any single failure within the protection system shall not prevent proper protective action at the system level when required. The applicant's analysi s should confirm that the requirements of the single failure crite- rion are satisfied. Guidance.in the application of the single failure criterion is provided.in IEEE Std 379 as supplemented by RG 1.53. Compo- nents and systems not qualified for seismic events or accident environ- ments and nonsafety-grade components and systems are assumed to fail to function if failure adversely affects protection system performance. These components and systems are assumed to function if functioning adversely affects protection system performance. All