Document: NUREG-0800
Document ID: 2ceb30a4-38c9-442c-bd66-5a699d0e6480
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500554.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ance criteria contained in BTP HICB-14 commensurate with the system it is designed to support. Application software should conform with the recommended practices of NUREG/CR-6463. Tools for developing application software or loading it into the PLC should be qualified to a level commensurate with the system they are designed to support. PLC-based functions should conform with the guidance regarding real-time performance and testing outlined in BTP HICB-21 and BTP HICB-17. Administrative or hardware lockout controls that prevent casual modification of the PLC program should be in place. This is particularly important because many PLCs are designed so that their programming is easy to modify. All program changes must be under configuration management control. In particular, administrative procedures for maintaining control of the software implemented in the PLC should be detailed in the configuration management plan. 4. Review Procedures PLC applications should be reviewed in the same manner as other digital computer instrument and control system applications. SRP Appendix 7.0-A, Section 7.1 and BTPs HICB-14 and HICB-17 describe these review procedures. Rev. 4 — June 1997 Appendix 7-A BTP HICB-18-4 C. References EPRI Topical Report TR-106439. "Guideline on Evaluation and Acceptance of Commercial Grade Digital Equipment for Nuclear Safety Applications." Electric Power Research Institute, October 1996. IEEE Std 7-4.3.2-1993. "IEEE Standard for Digital Computers in Safety Systems of Nuclear Power Generating Stations." NUREG/CR-6090. "The PLC and Its Application in Nuclear Reactor Protection Systems." September 1993. NUREG/CR-6421. "A Proposed Acceptance Process for Commercial Off-the-Shelf (COTS) Software in Reactor Applications." June 1996 NUREG/CR-6463. "Review Guidelines on Software Languages for Use in Nuclear Power Plant Safety Systems." June 1996. Regulatory Guide 1.152. "Criteria for Digital Computers in Safety Systems of Nuclear Power Plants." Office of Nuclear