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:
e NRC staff does not endorse any version of ISA-RP67.04.02, however, the staff believes those versions contain useful information. 2.2.8 ISA Recommended Practice ISA-RP67.04.02 Section 4.4 of ANSI/ISA 67.04.01-2018 identifies that additional information for determining total loop uncertainty may be found in ISA-RP67.04.02-2010. The NRC staff does not endorse any version of ISA-RP67.04.02, however, the staff believes those versions contain useful information. 3. Harmonization with International Standards The International Atomic Energy Agency (IAEA) works with member states and other partners to promote the safe, secure, and peaceful use of nuclear technologies. The IAEA develops safety standards for protecting people and the environment from harmful effects of ionizing radiation. The NRC staff reviewed guidance from the IAEA and the International Organization for Standardization. Clauses 6.205 through 6.212 of IAEA Specific Safety Guide SSG-39-2016, “Design of Instrumentation and Control Systems for Nuclear Power Plants,” (Ref. 12) and International Electrotechnical Commission (IEC) Standard 61888, “Nuclear power plants—Instrumentation important to safety—Determination and maintenance of trip setpoints,” issued 2002 (Ref. 13) present guidance like that found in earlier versions of ANSI/ISA 67.04.01. However, these documents are less rigorous than ANSI/ISA 67.04.01-2018. SSG- 39-2016 and IEC 61888 provide useful additional information as a technical reference. However, the staff does not endorse these documents. 4. Documents Discussed in Staff Regulatory Guidance This RG endorses the use of one or more codes or standards developed by external organizations, and other third-party guidance documents. These codes, standards and third-party guidance documents may contain references to other codes, standards or third-party guidance documents (“secondary references”). If a secondary reference has itself been incorporated by reference into NRC regulations as