Document: NUREG-0800
Document ID: d2f0cc81-920c-4065-b74b-67114ba68b0e
Document Type: srp
Title: through 7.9 of the SAR. Where exceptions are taken to the guidance provided by regulatory guides, and
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500493.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.2
CFR Part: 
CFR Title: 

Content:
I&C systems and components important to safety. Review Methods — Regulatory guides and endorsed codes and standards applicable to I&C systems important to safety are identified in Section 4 of this appendix. These guidelines provide the information needed to determine their applicability. The review of Section 7.1 of the SAR should confirm that the appropriate regulatory guides and endorsed standards are identified as applicable for each instrument and control system important to safety. The evaluation of the quality assurance program and appropriate records are addressed in the review of Section 17 of the SAR. b. Criterion 2 — Design Bases for Protection Against Natural Phenomena "Structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions. The design bases for these structures, systems, and components shall reflect: (1) appropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, Rev. 4 — June 1997 SRP 7.1-A-12 quantity, and period of time in which the historical data have been accumulated, (2) appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena, and (3) the importance of the safety functions to be performed." Applicability — All instrumentation and control safety systems and supporting data communication systems. Review Methods — The design bases for protection against natural phenomena for I&C systems important to safety should be provided for the I&C system. The design bases should identify those systems and components which should be qualified to survive the effects of earthquakes and other natural phenomena. The review should confirm that the I&C systems important to