Statistical test device and method for verifying safety failure rate of nuclear safety class instrumentation and control platform

Abstract

The invention discloses a statistical test device for verifying safety failure rate of a nuclear safety class instrumentation and control platform. The device comprises a statistical test unit, a driving unit, an information acquisition unit and a storage unit. The information acquisition unit is connected with the statistical test unit through the driving unit; and the statistical test unit realizes data interaction with the storage unit. According to a statistical test method based on the statistical test device, by carrying out system-level safety failure rate test in the platform development phase, possible defects of refusal of operation and misoperation in actual operation can be found in advance, thereby reducing maintenance cost and preventing safety risks; and meanwhile, actual measurement evidences are provided to check whether the platform meets nuclear power plant safety level instrumentation and control system safety failure rate indexes, and thus user confidence can be improved. Operation refusal rate is tested through a signal value random input method, thereby breaking a fixed input combination mode, and improving defect detection percentage to the maximum degree.

Description

technical field [0001] The invention relates to the technical field of nuclear safety, in particular to a statistical testing device and method for verifying the safety failure rate of a safety-level instrument and control platform in the nuclear power industry. Background technique [0002] The safety failure rate includes the probability of system refusal to operate and the probability of malfunction. At present, domestic and foreign instrument and control system manufacturers mainly include the following two methods for the verification of the safety failure rate: [0003] 1) Evaluation analysis method, based on the basic failure rate data of each component of the instrument and control system, analyze and calculate the theoretical evaluation value through reliability modeling and fault tree analysis methods, and finally give a reliability analysis report to prove that The safety failure rate of the safety-level instrument and control system of nuclear power plants can me...

AI Technical Summary

Problems solved by technology

[0007] a) The number of tests and test time are limited by the actual project progress, the life of the contact output of the system under test, and the performance of the test device. The test results cannot reach sufficient confidence and cannot be used as a direct proof of the safety failure rate;

[0008] b) The test execution stage is late, and the relevant tests can only be started after the actual system integration debugging and basic testing are completed. After problems are found at this stage, the cost of modification is high;

[0009] c) The test method and test device can only be tested according to the pre-designed fixed script, there are few verifiable logic combinations, and the defect detection rate is low

Images