Document: NRC Regulatory Guide
Document ID: bcbe26a0-004f-4616-b7f4-b32b2bfe4909
Document Type: regulatory_guide
Title: Setpoints for Safety-Related Instrumentation (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2005/ML20055G823.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.105
CFR Part: 
CFR Title: 

Content:
to 10 CFR Part 50. • 10 CFR 50.55a(h) states that protection systems of nuclear power reactors of all types must meet the requirements specified in 10 CFR 50.55a(h), and each combined license for a utilization facility is subject to the conditions in 10 CFR 50.55a(h). o In 10 CFR 50.55a(h), the NRC incorporates by reference Institute of Electrical and Electronics Engineers (IEEE) Standard 279-1968, “Proposed IEEE Criteria for Nuclear Power Plant Protection Systems,” (Ref. 4) Standard 279-1971, “Criteria for Protection Systems for Nuclear Power Generating Stations,” (Ref. 5) and IEEE Standard 603-1991, “Criteria for Safety Systems for Nuclear Power Generating Stations,” (including the correction sheet dated January 30, 1995) (Ref. 6) and applies one of them to nuclear power plants on the basis of the plant licensing date or other criteria. Clauses 3(6) and 4.1 of IEEE 279-1971 require the determination and documentation of setpoints for protective actions. Clause 6.8 of IEEE 603-1991 requires that the allowance for uncertainties associated with a setpoint be established in accordance with a documented methodology. Related Guidance • NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition,” Chapter 7, “Instrumentation and Controls,” Branch Technical Position 7-12, “Guidance on Establishing and Maintaining Instrument Setpoints,” (Ref. 7) provides guidelines for the NRC staff’s review of the process an applicant or licensee uses to establish and maintain instrument setpoints. DG-1363, Page 3 • Generic Letter 91-04, “Changes in Technical Specification Surveillance Intervals To Accommodate a 24-Month Fuel Cycle,” dated April 2, 1991 (Ref. 8) provides guidance on acceptable methods for licensees to justify an increase in calibration surveillance intervals using as-found and as-left calibration data from past calibration surveillances. • Regulatory Issue Summary (RIS) 2006-017,