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:
es 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 safety are qualified for protection against natural phenomena consistent with the analysis of these events as provided in Chapter 3 of the SAR, and that they are located and housed in structures consistent with these requirements. The evaluation of the adequacy of qualification programs to demonstrate the capability of I&C systems to withstand the effects of natural phenomena is addressed in the review of Section 3.10 of the SAR. The instrumentation systems needed for severe accidents must be designed so there is reasonable assurance that they will operate in the severe-accident environment for which they are intended, and over the time span for which they are needed. They need not be subject to additional environmental or seismic qualification testing or analysis. The review of conformance with GDC 2 should be coordinated with the Plant Systems Branch (SPLB) and the Mechanical Engineering Branch (EMEB). c. Criterion 4 — Environmental and Missile Design Bases "Structures, systems, and components important to safety shall be designed to accommodate the effects of and to be compatible with the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including loss-of-coolant accidents. These structures, systems, and components shall be appropriately protected against dynamic effects, including the effects of missiles, pipe whipping, and discharging fluids that may result from equipment failures and from events and conditions outside the nuclear power unit." Applicability — All I&C safety systems and supporting data communication systems. Review Methods — The environmental and missile design bases for I&C systems important to safety should be provided for each system in subsequent sections of Chapter 7 of the SAR.