Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
nerability of a structure, or system, or component (or their combination) whose failure contributes to core damage or large early release (or large release). The fragility analysis uses plant-specific information and an accepted engineering method for evaluating failures. DG-1362, Page 31 Other Hazard Plant Response Analysis uses a model that includes all important initiating events and other important failures caused by the effects of the hazard that can lead to core damage or large early release (or large release). The model is adapted from the internal events, at-power PRA model to incorporate unique aspects related to the hazard analyzed that are different from the at-power, internal events PRA model. Table 10. Summary of Technical Characteristics and Attributes of Other Hazard PRA for the At-Power Operating Mode Element Technical Characteristics and Attributes Other Hazard Analysis • Probabilistic Hazard analysis - results in frequency of occurrence of hazard at the site - based on site-specific data - reflects recent information - uses historical data or a phenomenological model, or a mixture of the two Other Hazard Fragility Analysis • Fragility estimate - plant-specific, - SSC-specific information - uses accepted engineering methods - walkdowns, if applicable, focus on as-built and as-operated plant configuration Other Hazard Plant Response Analysis • Hazard model - includes all important initiating events related to hazard analyzed - includes other significant failures that can lead to CDF or LERF/LRF - adapted from the internal events, at-power PRA model - incorporates unique aspects related to hazard analyzed that are different from the at-power, internal events PRA model. Technical Elements for Level 1 and Level 2 Low-Power and Shutdown PRA The objectives of the technical elements for a Level 1 or Level 2 low-power and shutdown PRA are similar to the objectives of the technical elements for a Level 1, internal events, at-power PRA and a Level 2,