Document: NUREG-0800
Document ID: 14c7085e-8b87-4b50-97fb-a095ea003ae8
Document Type: srp
Title: describes the general procedures to be followed in reviewing any I&C system. Procedures for
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500511.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
f normal operation which are expected to occur one or more times during the life of the nuclear power unit, and include but are not limited to loss of power to all recirculation pumps, tripping of the turbine generator, isolation of the main condenser, and loss of all offsite power. – Identification by the applicant/licensee of the bounding events and their bases in the analyses that are presented or referenced in SAR Chapter 15. The reviewer should confirm with SRXB that the analytical basis for each diverse I&C system is acceptable and consistent with the Chapter 15 analysis, and should confirm with SRXB and Plant Systems Branch (SPLB) that the design of the mechanical systems used for ATWS mitigation is acceptable. – Identification of the range of transient and steady-state conditions for both the energy supply and the environment during normal, abnormal, and accident conditions under which the system must perform. The environmental qualification basis for the ATWS mitigating equipment should be derived from the analysis of the effects of the anticipated operational occurrences. – Identification of the performance requirements. The submittal should identify performance requirements for which credit is taken in the mitigation of design basis events (e.g., dynamic response and accuracy). The review should confirm that the applicant/licensee verifies conformance to these requirements by validation testing and surveillance. • Quality of components and modules — Generic Letter 85-06 provides acceptable guidance for the quality assurance of diverse I&C systems and components. • System testing and surveillance — The applicant/licensee should have identified the test, maintenance, surveillance, and calibration procedures. These provisions should be consistent with the guidance of Generic Letter 85-06. The ATWS mitigation system should be testable at power (up to, but not necessarily including, the final actuation device). • Defense-in-depth and diversity