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:
Revision 6 – August 2016 initiates protective actions before safety limits are exceeded. RG 1.105, “Setpoints for Safety- Related Instrumentation,” and BTP 7-12, “Guidance on Establishing and Maintaining Instrument Setpoints,” provide guidance on the establishment of instrument setpoints. The instrument performance data used in setpoint analyses should be consistent with the performance requirements established in the design basis as discussed in Clause 3(9) of IEEE Std 279-1971. BTP 7-6, “Guidance on Design of Instrumentation and Controls Provided to Accomplish Changeover from Injection to Recirculation Mode,” provides specific guidance for determining if the timing margins for changeover from injection to recirculation mode are sufficient to allow manual initiation of the transition. Clause 3(7) of IEEE Std 279-1971 requires in part that the range of transient and steady-state conditions be identified for both the energy supply and the environment during normal, abnormal, and accident conditions under which the system must perform. This information is used in subsequent evaluations. Clause 3(8) of IEEE Std 279-1971 requires in part the identification of malfunctions, accidents, or other unusual events that could physically damage protective system components or could cause environmental changes leading to functional degradation of system performance, and for which provisions must be incorporated to retain necessary protective action. This information is used in subsequent evaluations, with special attention given to Clause 4.4 of the standard, “Equipment Qualification.” Clause 3(9) of IEEE Std 279-1971 requires in part the identification of the minimum performance requirements including (a) system response times, (b) system accuracies, (c) ranges (normal, 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