Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-Tree/Fault-Tree (ET/FT) Method

<table class="table-group" id="tab8"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Case</td><td class="align_center">Base case</td><td class="align_center">Case 1</td><td class="align_center">Case 2</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">TI</td><td class="align_center">6 months</td><td class="align_center">3 months</td><td class="align_center">1 month</td></tr><tr><td class="align_left">Probability of system failure</td><td class="align_center">1.47 × 10<sup>−6</sup></td><td class="align_center">7.33 × 10<sup>−7</sup></td><td class="align_center">2.44 × 10<sup>−7</sup></td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Probability of the system failure on demand under different TI.</div>

Science and Technology of Nuclear Installations

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Table 8

Table 8: Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-Tree/Fault-Tree (ET/FT) Method 