Direct qualification of digital components

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Description

Existing methods for qualifying digital system software for use in safety critical systems are expensive and are based on inferences that are of doubtful validity. This report on work-in-progress describes a new approach to qualifying a class of small safety systems that can meet a number of design restrictions, where the restrictions are carefully crafted to permit safety qualification to be determined by means of static analysis of the software combined with a limited amount of testing. This approach differs from attempts to qualify unrestricted programs in the general case. Work that has been accomplished towards this goal is discussed ... continued below

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11 p.

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Lawrence, J. D., LLNL July 8, 1998.

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Description

Existing methods for qualifying digital system software for use in safety critical systems are expensive and are based on inferences that are of doubtful validity. This report on work-in-progress describes a new approach to qualifying a class of small safety systems that can meet a number of design restrictions, where the restrictions are carefully crafted to permit safety qualification to be determined by means of static analysis of the software combined with a limited amount of testing. This approach differs from attempts to qualify unrestricted programs in the general case. Work that has been accomplished towards this goal is discussed in summary terms. The technique relies on transforming a program into a form of directed graph known as a flowgraph. Existing testing theory is used, sometimes with minor modifications, to derive a set of design restrictions that permit reasoning about safety properties of the program, based on analysis and limited testing. Future work required to complete the research is outlined.

Physical Description

11 p.

Notes

OSTI as DE98057886

Source

  • American Nuclear Society international topical meeting on safety of operating reactors, San Francisco, CA (United States), 11-14 Oct 1998

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  • Other: DE98057886
  • Report No.: UCRL-JC--130821
  • Report No.: CONF-981011--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 310932
  • Archival Resource Key: ark:/67531/metadc677793

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • July 8, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 8, 2017, 12:44 p.m.

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Lawrence, J. D., LLNL. Direct qualification of digital components, article, July 8, 1998; California. (digital.library.unt.edu/ark:/67531/metadc677793/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.