Document: NUREG-0800
Document ID: 4cca74ec-66e0-4765-9c61-cf547e17c308
Document Type: srp
Title: of the plant safety analysis report (SAR).  Although the NRC did not endorse the annexes of
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A114.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.6
CFR Part: 
CFR Title: 

Content:
ecification for Qualifying a Commercially Available PLC for Safety-Related Applications in Nuclear Power Plants,” as accepted by the NRC safety evaluation dated July 30, 1998, provides more specific guidance for the evaluation of existing programmable logic controllers (PLC). The fundamental criteria for demonstrating reasonable assurance that the computer will perform its intended safety functions is presented in this portion of IEEE Std 7-4.3.2 and additional guidance is provided in EPRI TR-106439 and EPRI TR-107330. The qualification process should be accomplished by evaluating the hardware and software design using the criteria of IEEE Std 7-4.3.2. Acceptance should be based upon evidence that the digital system or component, including hardware, software, firmware, and interfaces, can perform the required functions. The acceptance and its basis should be documented and maintained with the qualification documentation. In those cases where traditional qualification processes cannot be applied, an alternative approach to verify that a component is acceptable for use in a safety-related application is commercial grade dedication. The objective of commercial grade dedication is to verify that the item being dedicated is equivalent in quality to equipment developed under a 10 CFR Part 50 Appendix B program. The dedication process for the computer should entail identification of the physical, performance, and development process requirements necessary to provide adequate confidence that the proposed digital system or component can achieve the safety function. The dedication process should apply to the computer hardware, software, and firmware that are required to accomplish the safety function. The dedication process for software and firmware should include an evaluation of the design process. The preliminary and detailed phase activities for commercial grade item dedication are described in Sub-Clauses 5.4.2.1 through 5.4.2.2 of IEEE Std 7-4.3.2. 5.5 System