Document: NRC Regulatory Guide
Document ID: fc586342-92f7-4c77-ae76-79e3674cf288
Document Type: regulatory_guide
Title: Criteria for Programmable Digital Devices in Safety-Related Systems of  Nuclear Power Plants + HISTORY –HISTORY 02/2023 – DG-1374, Proposed Revision 4 Prior to issuance of DG-1374, RG 1.152 was entitled, “Criteria for Use of Computers in Safety-Systems of Nuclear Power Plants” 06/2010 – DG-1249, Proposed Revision 3 – Revise 12/2004 – DG-1130, Proposed Revision 2 – Revise 05/1995 – DG-1039, Proposed Revision 1 03/1983 – DG-1130, Proposed Revision 2 – Revise (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2301/ML23012A242.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.152
CFR Part: 
CFR Title: 

Content:
tion unless the document requesting or requiring the collection displays a currently valid OMB control number. DG-1374, Page 4 B. DISCUSSION Reason for Revision This revision (Revision 4) of the guide endorses IEEE Std 7-4.3.2-2016 with exceptions and clarifications. Specifically, this revision removes the previous SDOE guidance from this guide and instead endorses, with clarifications, the SDOE criteria within IEEE Std 7-4.3.2-2016. This revision also includes additional guidance for fault detection and self-diagnostics, if used, in DI&C systems. In addition, this revision endorses Annex D of IEEE Std 7-4.3.2-2016 and clarifies the applicability of the control of access guidance for safety-related PDDs. Background The regulation in 10 CFR 50.55a(h)(2) requires that protection systems for nuclear power plants meet the requirements of IEEE Std 279-1968, IEEE Std 279-1971, or IEEE Std 603-1991 and the correction sheet dated January 30, 1995, depending on the licensing basis of the nuclear power plants. The American Nuclear Society Standards Committee and the Nuclear Power Engineering Committee of the IEEE Power Engineering Society developed IEEE Std 7-4.3.2 in 1982 to supplement IEEE Std 603 with criteria for programmable digital computer systems. Since then, IEEE Std 7-4.3.2 has been updated periodically to encompass the evolved digital technologies. With respect to the use of PDDs in safety-related systems, revision 2016 of IEEE 7-4.3.2 states “This standard specifies additional digital system requirements to supplement the criteria and requirements of IEEE Std 603™-2009…” (Ref. 11). The NRC staff has reviewed Revision 2016 of IEEE 7-4.3.2 and finds that it provides acceptable supplemental guidance on how to meet the criteria of IEEE Std 603-1991 incorporated by reference in 10 CFR 50.55a(h). The staff’s endorsement of Revision 2016 of IEEE 7-4.3.2, with exceptions and clarifications, is discussed in Section C of this RG. The instrumentation and controls