Seismic PRA Report (Task 15)

Task Overview

Objective

The objective is to document the SPRA methodology used and the results of the study in a manner that is useful for peer review, updating and applying to risk informed applications.

Purpose

This section describes a modular notebook structure for documenting an SPRA.

Guidance

The individual notebooks may include, but are not limited to, the following:

• Seismic Methods and Results Notebook

- Describes the key elements of the SPRA model process including PSHA, internal event PRA, success criteria, walkdown observations, SSC fragilities, guidelines, treatment of consequential hazards and the quantitative results.

- The Seismic Methods and Results Notebook could be expanded to develop separate notebooks to document Consequential Hazards and the Quantitative Results if preferred by the SPRA analyst.

• Seismic Initiating Events Notebook

- Documents the analysis of the initiating event categories from seismic hazard intervals, frequencies, error factors and ground motion calculations

• Seismic Event Tree Notebook

- Explains the event tree sequence quantification of postulated accident scenarios in the SPRA.

• Seismic Human Reliability Notebook

- Develops and recommends the best estimate of HEPs for use in the SPRA.

• Seismic Fragility Modeling Notebook

- Evaluates fragility frequencies from the failure of an SSC and explains how these are modeled into the SPRA

• Seismic Plant Walkdown Notebook

- Documents plant-specific observations and aspects that would support the reasonableness of the seismic impacts to be incorporated into the SPRA.

Supplemental Guidance

Related Element of ASME/PRA Standard

Part 5, Seismic Hazard Analysis (SHA)

Part 5, Seismic Fragility Response (SFR)

Part 5, Seismic Plant-Response (SPR)

EPRI Guidance

Seismic Probabilistic Risk Assessment Implementation Guide (3002000709). Appendix F provides example outlines for SPRA documentation.

Other Guidance

(none noted)