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Pages 1-6

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From page 1...
... Response of the U.S. Nuclear Regulatory Commission to the Challenges The USNRC has reviewed a number of analog-to-digital "retrofits" in nuclear power plant I&C systems and is in the
From page 2...
... In areas 3 Licensing of any systems for use in a nuclear power plant is governed by formal, documented criteria that the USNRC and the regulated industry use to implement changes to a nuclear power plant. General criteria, applicable to either digital or analog I&C systems in nuclear plants, are contained in the Code of Federal Regulations, Part 50, Appendix A
From page 3...
... The six technical issues are systems aspects of digital I&C technology, software quality assurance, common-mode software failure potential, safety and reliability assessment methods, human factors and humanmachine interfaces, and dedication of commercial off-theshelf hardware and software. The two strategic issues are the case-by-case licensing process and the adequacy of technical infrastructure (i.e., training, staffing, research plan)
From page 4...
... For the key strategic issues (the case-by-case licensing procedure and adequacy of the technical infrastructure) the committee: · Emphasizes guidance to implement a generically applicable framework for regulation that follows current USNRC practice and draws a distinction between major and minor safety modifications.
From page 5...
... Functional tests can be chosen to expose errors in normal and boundary cases, and measures of test coverage can be reported for them. Testing based on large numbers of inputs randomly selected from the operational profiles of a program can be used to assess the likelihood that software will fail under specific operating conditions.
From page 6...
... that perform different functions is a potentially effective means of achieving diversity. Analysis of software functional diversity showing that independence is maintained at the system level and no new failure modes have been introduced by the use of digital technology is no different from that for upgrades or designs that include analog instrumentation.


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