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This report (System Safety 2.1) is the second in a nine-part
series of recommendations addressing the functional safety of
processor-controlled mining equipment. It is part of a risk based system safety
process encompassing hardware, software, humans, and the operating environment
for the equipment's life cycle. The reports in this series address the various life cycle
stages of inception, design, approval and certification, commissioning,
operation, maintenance, and decommissioning. These recommendations were
developed as a joint project between the National Institute for Occupational
Safety and Health and the Mine Safety and Health Administration. They are
intended for use by mining companies, original equipment manufacturers, and
aftermarket suppliers to these mining companies. Users of these reports are
expected to consider the set in total during the design cycle.
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1.0 Safety Introduction. - This is an introductory report for
the general mining industry. It provides basic system/software safety
concepts, discusses the need for mining to address the functional safety of
programmable electronics, and includes the benefits of implementing a
system/software safety program.
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2.1 System Safety and 2.2 Software Safety. - These reports
draw heavily from International Electrotechnical Commission (IEC) standard
61508 [IEC 1998a,b,c,d,e,f,g] and other recognized standards. The scope is
"surface and underground safety mining systems employing embedded, networked,
and non-networked programmable electronics." System safety seeks to design
safety into all phases of the entire system. Software is a subsystem; thus,
software safety is a part of the system's safety.
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3.0 Safety File. - This report contains the documentation that
demonstrates the level of safety built into the system and identifies
limitations for the system's use and operation. In essence, it is a "proof of
safety" that the system and its operation meet the appropriate level of safety
for the intended application. It starts from the beginning of the design, is
maintained during the full life cycle of the system, and provides
administrative support for the safety program of the full system.
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4.0 Safety Assessment. - The independent assessment of the
Safety File is addressed. It establishes consistent methods to determine the
completeness and suitability of safety evidence and justifications. This
assessment could be done by an independent third party.
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5.0 Safety Framework Guidance. - It is intended to supplement
the safety framework reports with guidance that provides users with additional
information. The purpose is to help users in applying the concepts presented.
In other words, the safety framework is what needs to be done and the guidance
is how it can be done. The guidance information reinforces the concepts,
describes various methodologies that can be used, and gives examples and
references. It also gives information on the benefits and drawbacks of various
methodologies. The guidance reports are not intended to promote a single
methodology or to be an exhaustive treaty of the subject material. They
provide information and references so that the user can more intelligently
choose and implement the appropriate methodologies given the user's
application and capabilities.
Author(s): | Sammarco-JJ, Fisher-TJ |
Reference: | U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2001-137, Information Circular 9458, 2001 Apr; :1-47 |
2001-137 (PDF, 496 KB)
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Related Documents:
- Programmable Electronic Mining Systems: Best Practice Recommendations (In Nine Parts) - Part 1: 1.0 Introduction (PDF, 503 KB, 2001-04)
- Programmable Electronic Mining Systems: Best Practice Recommendations (In Nine Parts) - Part 3: 2.2 Software Safety (PDF, 1515 KB, 2001-09)
- Programmable Electronic Mining Systems: Best Practice Recommendations (In Nine Parts) - Part 4: 3.0 Safety File (PDF, 426 KB, 2002-05)
- Programmable Electronic Mining Systems: Best Practice Recommendations (In Nine Parts) - Part 5: 4.0 Independent Functional Safety Assessment (PDF, 527 KB, 2003-05)
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