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Investigation Committee of Safety Standards |
Purpose and Progress of Safety Quantification Proposal
- Rank Matrix Method for Safety Diagnostics of Complex Systems -
To develop a technical guideline for system safety by using the Rank Matrix Method
In the case of safety issues, inherent safety has been emphasized for the mechanical systems since 1989, and no effort for the quantification of safety has been made.
However, systems containing electronic control devices and software systems have
remarkably increased recently and their safety could not be expressed in the inherent
safety.
As one of the quantification standards for the safety related to electronic systems
(IEC61508)(functional safety) was published in 1998, which evaluates safety with
risks.
When analyzing accidents of a complex system, it is usual that human being
get involved in them. With such the complex system, it is recommendable to study
associated primary causes with matrix comprehensively and try to obtain the optimum
state resulting from quantifying evaluation with all elements of the matrix.
For this reason, we Investigation Committee of Safety Standards, proposed Rank
Matrix Method as an evaluation method for complex systems to the IEC, international
organization. Since no organization of TC was available with this issue, we intended
to archive the Rank Matrix Method as a TTA(Technical Trend Assessment - a kind
of international standards documents).
In 2001, a document titled Matrix Rank Method for safety evaluation of complex
systems completed and after review of domestic IEC committee members, it was offered
to IEC Central Office as a level of TTA, which means Technical Trend Assessment,
a kind of international standard category.
Acceptance as TTA of IEC standards for this unique proposal took a voting methods
by member of SMB(standards management Boards of IEC) and this proposal was rejected
by the result that positive vote in not over 2/3, but over 1/2. (Oct.2002)
However, we believe that proposed idea on safety evaluation, that is a way
of quantitative on safety significance, was evaluated as an excellent application
method for complex systems safety under the modern industries.
The sub-committee intends to develop a new technical guideline which is included
into enhancement and expansion of Matrix Rank Method based on the original document.
The title of document was revised to "Rank-Matrix Method for safety diagnostics
of complex systems", and its contents are structured as follows ;
1. General concept,
2. Requirement,
3. Application for integrated manufacturing systems,
4. Application for building s and facilities.
The subcommittee is encouraging new safety experts from different industries to participate in this task to obtain the new promising goal.
MEMBER of safety diagnostics method special working group of IEICE
Yoshihisa Suzuki | |
Yoshiyuki Mineo | |
Takeshi Natsume | |
Kohhei.Sano | |
Eiji.Sakashita | |
Kazuhiro Hayashi | |
Yasuko Orihara |