Risk ranking methodology for chemical release events

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Risk ranking schemes have been used in safety analysis to distinguish lower risk accidents from higher risk accidents. This is necessary to identify those events that might warrant additional study or quantitative analysis and to ensure that any resources allocated for risk reduction are properly directed. A common method used for risk ranking utilizes risk matrices. These are typically 3x3 or 4x4 matrices having event consequences along one axis and event frequency along the other. Each block on the risk matrix represents some level of risk, and blocks presenting similar risk are often grouped together into one of three or ... continued below

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10 p.

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Brereton, S. & Alenbach, T. April 3, 1998.

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Description

Risk ranking schemes have been used in safety analysis to distinguish lower risk accidents from higher risk accidents. This is necessary to identify those events that might warrant additional study or quantitative analysis and to ensure that any resources allocated for risk reduction are properly directed. A common method used for risk ranking utilizes risk matrices. These are typically 3x3 or 4x4 matrices having event consequences along one axis and event frequency along the other. Each block on the risk matrix represents some level of risk, and blocks presenting similar risk are often grouped together into one of three or four risk regions. Once a risk matrix has been identified, events are placed on the matrix based on an estimate of the event consequence and event frequency. Once the risk of each block on the matrix is defined, the relative risk of the events can be found based on where they are placed on the matrix. In most cases, the frequency axis of the matrix has numerical values associated with it, typically spanning several orders of magnitude. Often, the consequence axis is based on a qualitative scale, where consequences are judgment based. However, the consequence scale generally has implicit quantitative values associated with it, which may or may not be recognized. Risk regions are often arbitrarily assigned (or assigned on the basis of symmetry). This presents a problem in that if the blocks Of the risk matrix are incorrectly grouped, then incorrect conclusions can be drawn about the relative risk presented by events at a facility. This paper first describes how risk matrices have typically been established in the past. Problems associated with these risk matrices are identified and discussed. A methodology for logically establishing risk matrices, with specific application to chemical risk, is provided.

Physical Description

10 p.

Notes

OSTI as DE98057738

Other: FDE: PDF; PL:

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  • International conference on probabilistic safety assessment and management (PSAM4), New York, NY (United States), 13-18 Sep 1998

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  • Other: DE98057738
  • Report No.: UCRL-JC--128510
  • Report No.: CONF-980907--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 292198
  • Archival Resource Key: ark:/67531/metadc681194

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  • April 3, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 6, 2017, 6:27 p.m.

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Brereton, S. & Alenbach, T. Risk ranking methodology for chemical release events, article, April 3, 1998; California. (digital.library.unt.edu/ark:/67531/metadc681194/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.