Method for quantitatively evaluating value of security level DCS (Data Communication System) application software defect for nuclear power plant

A DCS system and quantitative evaluation technology, applied in the field of analysis of the software itself, can solve problems such as gaps

Active Publication Date: 2012-02-22
CHINA TECHENERGY +1
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Problems solved by technology

The current quantitative assessment of the value of the safety-level DCS application

Method used

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  • Method for quantitatively evaluating value of security level DCS (Data Communication System) application software defect for nuclear power plant
  • Method for quantitatively evaluating value of security level DCS (Data Communication System) application software defect for nuclear power plant
  • Method for quantitatively evaluating value of security level DCS (Data Communication System) application software defect for nuclear power plant

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Embodiment Construction

[0028] The method of the present invention will be described in detail below with reference to the drawings.

[0029] This program provides a calculation method for the probability that a defect in the application software of the safety-level DCS system of a nuclear power plant may cause unsafe consequences, and then a quantitative value is obtained to evaluate the value of the defect in the safety-level DCS application software of a nuclear power plant. figure 1 It is a schematic diagram of the defect X probability calculation model environment. The first vertical column in turn indicates that the utilization rate of the software with defect X in the protection system in the DCS is 10% of the total utilization rate, and the function A in the protection system uses this zone The utilization rate of the software of defect X is 30% of 10%, in this case function A generates two redundancy. The second vertical column indicates that the utilization rate of the software with defect X in...

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Abstract

The invention discloses a method for quantitatively evaluating a value of a security level DCS (Data Communication System) application software defect for a nuclear power plant, which comprises the following steps of: 1, analyzing a defect X according to a used system, and obtaining a use frequency F and a number r of redundancy functions of a function on which the defect X is located and the failure rate P(i) of each redundancy function; 2, utilizing a structure of actually used software to obtain logical branch probability PL through recognition of fault logic; 3, utilizing P(X)=F*PL*Pi<i=1><r> (1) to obtain probability P(X) of fault caused by the defect X; and 4, taking the step (1) into W=P(X)*E(2) to obtain a value W of the defect X. The method disclosed by the invention provides a significant reference for directly judging the contribution of nuclear power plant security level DCS application software V&V (Verification & Validation) personnel or software testers to a project, design quality of designers and the like.

Description

Technical field [0001] The invention relates to a method for analyzing the software itself, in particular to a method for analyzing the defect value of the application software of the safety-level DCS system of a nuclear power plant. Background technique [0002] According to IEEE729-1983, software defects are errors, defects and other problems in the development or maintenance of software products, as well as the failure or violation of certain functions that the system needs to achieve. For software defects, the common evaluation method is to classify them according to the priority, urgency and other dimensions, and then evaluate the value of software defects. The currently popular software classification and evaluation methods are as follows: [0003] 1. ODC defect analysis: launched by IBM's waston center. Organize the attributes of a defect in each link of the life cycle, analyze the defect from a single dimension and multiple dimensions, and obtain the defect density and de...

Claims

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Application Information

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IPC IPC(8): G06F11/36
Inventor 张冬伟李运坚张磊周良杨阳
Owner CHINA TECHENERGY
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