Document: NUREG-0800
Document ID: 1ab4716a-a40c-4204-ba6f-a70d75bcaedb
Document Type: srp
Title: INSTRUMENTATION AND CONTROLS - INTRODUCTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159B068.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
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CFR Title: 

Content:
ederal Regulations (10 CFR) 50.62, “Requirements for Reduction of Risk from Anticipated Transients Without Scram (ATWS) Events for Light-Water-Cooled Nuclear Power Plants.” For plants with digital computer- based instrumentation and controls, diverse I&C systems may also include hard- wired manual controls, diverse displays, and diverse actuation systems specifically installed to meet the guidance of the Staff Requirements Memorandum (SRM) on SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs.” This SRM describes the U.S. Nuclear Regulatory Commission (NRC) position on diversity and defense-in-depth. Diverse I&C systems are discussed in Section 7.8 of the SAR. H. Data communication systems transmit signals between systems and between components of systems and include analog and digital multiplexers as well as nonmultiplexed transmission. When such systems are included in a design, they support one or more of the categories of systems described above. They may also support I&C functions addressed in other sections of the SAR. Data communications systems are discussed in Section 7.9 of the SAR. I. Auxiliary supporting features and other auxiliary features are systems or components of systems that provide services required for the safety systems to accomplish their safety functions. Heating, ventilation, and air conditioning systems and electrical power systems are examples of auxiliary supporting features. Auxiliary supporting features are discussed primarily in Chapters 8 and 9 of the SAR. Examples of other auxiliary features include built-in test equipment and isolation devices. The I&C aspects of auxiliary supporting features and other auxiliary features are addressed in the review of those SAR sections that discuss the systems that provide these features. To the extent that the operation of auxiliary supporting features or other auxiliary features are initiated by the protection