Document: NUREG-0800
Document ID: db9aeb59-557f-4a92-984d-d29d30600143
Document Type: srp
Title: B-4
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:
re modes described in Section 7.7 of the SAR and the reactivity control interlock functions described in Section 7.6 of the SAR. Clause 3(2) of IEEE Std 279-1971 requires in part the identification of variables that are monitored in order to provide protective action. The tables in Sections 7.2 and 7.3 of the SAR should provide this information. Clause 3(3) of IEEE Std 279-1971 requires in part the identification of the minimum number and location of sensors for those variables in Clause 3(2) of IEEE Std 279-1971 that have a spatial dependence. The applicant’s or licensee’s analysis should demonstrate that the number and location of sensors are adequate. Subsection 4.2 below discusses the consideration of the single failure criterion in the evaluation of this analysis. Clauses 3(4), 3(5), and 3(6) of IEEE Std 279-1971 require in part the identification of operational limits, the margin between operational limits, and the level for the onset of unsafe conditions (setpoint), and limits that require protective action (safety limit - i.e., value assumed in the safety analysis) for each variable. The applicant’s or licensee’s analysis should confirm that an adequate margin exists between operating limits and setpoints, such that a low probability exists for inadvertent actuation of the system. The applicant’s or licensee’s analysis should confirm that an adequate margin exists between setpoints and safety limits, such that the system