Document: NUREG-0800
Document ID: 1df526d9-2ae0-4da2-b936-2e24b038ca8c
Document Type: srp
Title: DIVERSE INSTRUMENTATION AND CONTROL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070650035.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.8
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of instrumentation and controls Secondary - None I. AREAS OF REVIEW This Standard Review Plan (SRP) section describes the review process and acceptance criteria for the diverse instrumentation and control (I&C) systems and equipment provided for the express purpose of protecting against potential common-cause failures of protection systems. The objectives of this review are to assure that the anticipated transient without scram (ATWS) mitigation systems and equipment are designed and installed in accordance with the requirements of 10 CFR 50.62, “Requirements for reduction of risk from anticipated transients without scram (ATWS) events for light-water-cooled nuclear power plants,” and that other diverse I&C systems within the scope of this section comply with the NRC position on diversity and defense-in-depth (D3). 1. The following systems are covered by this section: • ATWS mitigation systems that are required for compliance with 10 CFR 50.62. As defined in 10 CFR 50.62, an ATWS event is an anticipated operational occurrence followed by failure of the reactor trip portion of the protection system. 10 CFR 50.62 identifies design requirements for ATWS mitigation systems and equipment. 7.8-2 Revision 5 - March 2007 • Diverse manual controls and displays that are provided to comply with the NRC position on D3 as described in the Staff Requirements Memorandum (SRM) regarding SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs.” These systems are to be independent and diverse from the associated digital safety systems(s). The associated operator interfaces (controls and displays) must be located in the main control room. They are to provide manual, system-level actuation of critical safety functions and monitoring of parameters that support the safety functions. • Diverse actuation systems (DAS) that are