PSAM 16 - Paper Overview

PSAM 16 Conference Paper Overview

Welcome to the PSAM 16 Conference paper and speaker overview page.

Lead Author: Brian D. Ehrhart Co-author(s): Benjamin B. Schroeder bbschro@sandia.gov Ethan S. Hecht ehecht@sandia.gov

Quantitative Risk Assessment Sensitivity Study as the Basis for Risk-Informed Consequence-Based Setback Distance Requirements for Liquid Hydrogen Storage Systems
A quantitative risk assessment on a representative liquid hydrogen storage system was performed to identify the main drivers of individual risk and provide a technical basis for revised separation distances for bulk liquid hydrogen storage systems in regulations, codes, and standards requirements. The quantitative risk assessment framework in Hydrogen Plus Other Alternative Fuels Risk Assessment Models (HyRAM+) was used, and multiple relevant inputs to the risk assessment (e.g., system pipe size, ignition probabilities) were individually varied. For each set of risk assessment inputs, the individual risk as a function of the distance away from the release point was determined, and the risk-based separation distance was determined from an acceptable risk criterion. These risk-based distances were then converted to equivalent leak size using consequence models that would result in the same distance to selected hazard criteria (i.e., extent of flammable cloud, heat flux, and peak overpressure). The leak sizes were normalized to a fraction of the flow area of the source piping. The results of this risk assessment sensitivity study were then used to select a conservative fractional flow area leak size of 5% that serves as the basis for consequence-based separation distance calculations. Individually varying risk assessment inputs provided insight into the sensitivity to specific input values and assumptions, and ultimately informed the conservatism of the final fractional flow area. This work demonstrates a method for using quantitative risk assessment to provide a technical basis for determining consequence-based separation distances. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.

Quantitative Risk Assessment Sensitivity Study as the Basis for Risk-Informed Consequence-Based Setback Distance Requirements for Liquid Hydrogen Storage Systems

A quantitative risk assessment on a representative liquid hydrogen storage system was performed to identify the main drivers of individual risk and provide a technical basis for revised separation distances for bulk liquid hydrogen storage systems in regulations, codes, and standards requirements. The quantitative risk assessment framework in Hydrogen Plus Other Alternative Fuels Risk Assessment Models (HyRAM+) was used, and multiple relevant inputs to the risk assessment (e.g., system pipe size, ignition probabilities) were individually varied. For each set of risk assessment inputs, the individual risk as a function of the distance away from the release point was determined, and the risk-based separation distance was determined from an acceptable risk criterion. These risk-based distances were then converted to equivalent leak size using consequence models that would result in the same distance to selected hazard criteria (i.e., extent of flammable cloud, heat flux, and peak overpressure). The leak sizes were normalized to a fraction of the flow area of the source piping. The results of this risk assessment sensitivity study were then used to select a conservative fractional flow area leak size of 5% that serves as the basis for consequence-based separation distance calculations. Individually varying risk assessment inputs provided insight into the sensitivity to specific input values and assumptions, and ultimately informed the conservatism of the final fractional flow area. This work demonstrates a method for using quantitative risk assessment to provide a technical basis for determining consequence-based separation distances. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.

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Lead Author Name: Brian Ehrhart (bdehrha@sandia.gov)

Bio: Brian Ehrhart is a Chemical Engineer at Sandia National Laboratories. Since 2017, he has worked to support technical analyses for safety codes and standards for alternative fuels, particularly hydrogen. His current and past work has focused on assessing risk for hydrogen vehicles, rail, and infrastructure; developing software codes for assessing various fire and thermal scenarios; and working to improve the National Fire Protection Association (NFPA) 2 Hydrogen Technologies fire safety code.

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PSAM 16 Conference Paper Overview

Welcome to the PSAM 16 Conference paper and speaker overview page.

Paper BD285 Preview

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