Conference Proceedings Paper
METHODS AND FACILITIES FOR VALIDATION AND SYSTEM INTEGRATION TESTING OF UPGRADED LEGACY SHUTDOWN SYSTEMS
11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04
A. Xing (Candu Energy Inc.)
L. Lowndes (Candu Energy Inc.)
Abstract In the Darlington design, each shutdown system consists of three Trip Computers, three Display/Test computers and a Monitor Computer. These computers are currently being upgraded due to hardware obsolesce and the associated maintenance burden. This paper describes the methods and facilities used to validate each individual computer and to perform system integration testing after each computer is successfully validated. A test computer with a specialized scripting tool/language is developed for both validation testing and system integration testing. In order to reduce engineering costs, the scripting tool/language is maintained backward compatible for re-use of scripts developed in the previous project. A purposely built test rig consists of computers under test that can be configured to any one of the three channels of a shutdown system, with the other two channels simulated using communication packet simulators. The test computer has extended I/O capability to drive inputs to all three computers and confirm the behavior of each individual computer as well as the behavior of the integrated system, eliminating the set of voltages sources and the panel of digital switches used in the previous project. Validation and system integration testing is performed by a team independent from the development team using a black-box approach and the testing is automated to the maximum extent practical. The test facilities/tools developed and qualified for this project can be easily adapted for use in future projects.
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