By RT Wood; Oak Ridge National Laboratory. .; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information

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The verification approach adopted provided evidence that the software design performed all functions specified and did not perform any unintended functions. The CNSC staff insisted that the group of verifiers must be independent of the group responsible for design and implementation of the software. For both SDS1 and SDS2, the licensee performed unit testing, software integration testing, validation testing, system integration testing, and reliability qualification. The CNSC staff followed and reviewed the testing activities and found that minor deviations from the system specification occurred during the first loop of the software cycle.

In addition, the deterministic analysis should be supplemented by a probabilistic safety analysis to reveal any potential design weaknesses and confirm that reliability goals are met. The safety case is the end product of a licensee's assessment of a proposed activity. NSD assesses a safety case to establish confidence in the arguments advanced by the licensee and to determine if the latter has, as a minimum, met its own criteria and demonstrated that the risks are ALARP. The licensee is responsible for safety at all times, and NSD requires that the licensee undertakes adequate peer review and independent assessment of its safety cases.

Several of the dynamic PPS validation tests using the computerized test harness did not work. At first, these results were classified as test failures, implying problems with the PPS. However, British Energy engineers concluded that the PPS test harness contained timing problems. Those timing problems were resolved, and the tests were executed again with positive results. 23 az France EdF identified several unresolvable issues with the initial design for the control and protection system of the Chooz B Nuclear Power Station.

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Advanced Reactor Licensing : Experience with Digital I&C Technology in Evolutionary Plants by RT Wood; Oak Ridge National Laboratory. .; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information


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