Document: NUREG-0800
Document ID: f4b8f0c1-9a14-46be-88c9-a6cb74d64dff
Document Type: srp
Title: Rev. 4 — June 1997
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500499.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
tems that initiate and control auxiliary feedwater systems. BTP HICB-5 provides specific guidance on the reactivity control malfunctions that should be considered in the identification of design basis events. The malfunctions assumed should be consistent with the control system failure modes described in Section 7.7 of the SAR and the reactivity control interlock functions described in Section 7.6 of the SAR. Section 4.4 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. Performance requirements — including system response times, system accuracies, ranges, and rates of change of sensed Rev. 4 — June 1997 SRP 7.1-C-4 variables to be accommodated until conclusion of the protective action — should also be identified in the system designation. The applicant/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. Section 4.5 describes the minimum criteria under which manual initiation and control of protective actions may be allowed. BTP HICB-6 provide specific guidance on determination if the timing margins for changeover from injection to recirculation mode are sufficient to allow manual initiation of the transition. Section 4.6 requires in part the identification of the minimum number and location of sensors for those variables in 4.4 that have a spatial dependence. The applicant/licensee's analysis should demonstrate that the number and location of sensors are adequate. Item 6 below discusses the consideration of the single failure criterion in the evaluation of this analysis. Section 4.4 requires in part the identification of the analytical limit associated with each variable. Review considerations in confirming that an adequate margin exists between analytical limits and setpoints are discussed