Document: NUREG-0800
Document ID: e32f0820-4e33-476e-aa36-4ca8c2c64af0
Document Type: srp
Title: Use of Probabilistic Risk Assessment in Plant-Specific, Risk-Informed Decisionmaking:
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0119/ML011940192.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
actuation circuitry, or common support systems like AC or DC power or instrument air for initiation or actuation) and conditions needed for actuation (e.g., low RPV water level). isolation requirement dependencies (e.g., conditions that could cause more than one system to isolate, trip, or fail) including environmental conditions (temperature, pressure, and/or ihumidity), temperature and pressure of fluids being processed, water level status, and radiation levels. * power requirement dependencies (e.g., systems that depend on the same power sources for motive power) * cooling requirement dependencies (e.g., systems that depend on the same room cooling subsysterr, or the same lube oil cooling subsystem, or systems that depend on the same service water or component cooling water train for cooling) * indication requirement dependencies (e.g., systems that depend on the same pressure, temperature, or level instrumentation for operation) 0 phenomenological effect dependencies (e.g., conditions generated during an accident sequence that influence the operability of more than one system), including generation of harsh environments that result in protective trips of systems, loss of pump net positive suction head (NPSH) when containment heat removal is lost, clogging of pump strainers from debris generated during a LOCA, failure of components outside the containment following containment failure attributable to harsh environmeni inside the containment, closure of safety relief valves in BWRs on high containment pressure, and coolant pipe breaks or equipment failures following (or resulting from) containment failure operational dependencies (e.g., unavailability of the suppression pool cooling mode for a train of the residual heat removal system when the system is in the low pressure coolant injection mode) SRP 19-A8 Reviewers should look for evidence that the licensee properly considered the above types of dependencies in the evaluation of the change. In most cases, these